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-1- a a e e h h h h a a l l f f - - b b r r i i c c k k s s e e r r i i e e s s t t e e c c h h n n i i c c a a l l r r e e f f e e r r e e n n c c e e n n o o t t e e s s 48v input, 2.5v output 48v input, 2.5v output 50-150w dc-dc converter 50-150w dc-dc converter (rev01) usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 publishing date: 20020702
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -2- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com introduction introduction the aeh series comes in a industry standard half-brick package of 2.4" x 2.28" x 0.5" and footprint, and incorporates the super high effi- ciency up to 87% in 2.5v output and high power density up to 54.8w/in 3 . the aeh series is available with 2:1 input range of 36v-75v ( and 36v-72v is for 5v output ). outputs of 2.5v, 3.3v, and 5v are fully isolated from input and the isolation voltage is 1500vdc. the typical efficiencies are 90% for the 5v output, 89% for the 3v output, and 87% for the 2.5v out- put. designed using a synchronous rectification topology, aeh series incorporates simple struc- ture, good electrical performance and high reli- ability. standard features include input lvp, ocp, output ovp, short circuit protection, and over-temperature protection. using aluminum based plate, the maximum case temperature can reach 100 c without derating. the aeh series is designed to meet cispr22, fcc class a, ul, tuv, and csa certifications. design features design features high efficiency high power density low output noise metal baseplate cnt function remote sense trim function input under-voltage lockout output short circuit protection output current limiting output over-voltage protection overtemperature protection high input-output isolation voltage options options heat sink available for extended operation. choice of cnt logic configuration.
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -3- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com fuse* tr i m -vout -sense +vout +sense -vin cnt +vin load c4 c2 case vin c1 c3 fuse*: use external fuse ( fast blow type ) for each unit. 50w rated output : 5a fuse 75w rated output : 7.5a fuse 100w rated output : 10a fuse 150w rated output : 20a fuse c1: recommended input capacitor c1 -40 c~ +100 c: m 47f/100v electrolytic capacitor. c2: recommended output capacitor c2 0c~ +100c: one 2200 f/ 6.3v electrolytic capacitor below 0c: use 1 x 220f tantalum capacitor parallel with a 2200f/ 6.3v electrolytic capacitor c3: recommended 4700pf/2000v c4: recommended 1f/10v t t ypical application ypical application
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -4- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com block diagram block diagram ordering information ordering information aeh10g48n 36-75v negative 10a 40 150 84% 86% aeh10g48 36-75v positive 10a 40 150 84% 86% aeh15g48n 36-75v negative 15a 40 150 83% 85% aeh15g48 36-75v positive 15a 40 150 83% 85% aeh20g48n 36-75v negative 20a 40 150 85% 87% aeh20g48 36-75v positive 20a 40 150 85% 87% aeh30g48n 36-75v negative 30a 40 150 83% 85% aeh30g48 36-75v positive 30a 40 150 83% 85% +vout -vout +sense -sense trim +vin -vin cnt model input cnt output ripple noise efficiency number voltage logic current (mv rms) (mv pp) min typ
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -5- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com absolute maximum rating input voltage(continuous) -0.3 80 vdc input voltage(peak/surge) -0.3 100 vdc 100ms non-repetitive operating temperature -40 100* c *: case temperture storage temperature -55 125 c input characteristics input voltage range 36 48 75 vdc input reflected current 25 50 map-p turn-off input voltage 30 33 35 v turn-on input voltage 31 34 36 v turn on time 15 25 ms cnt function logic high 3 15 vdc logic low 1.2 vdc control current 2 ma general specifications mtbf 2080 k hrs bellcore tr332, t c=30c isolation 1500 vdc pin solder temperature 260 c wave solder < 10 s hand soldering time 5 s iron temperature 425c weight 70 grams characteristic min typ max units notes characteristic min typ max units notes characteristic min typ max units notes characteristic min typ max units notes
aeh10g48(n) output characteristics power 25 w output current 10 a output setpoint voltage 2.475 2.5 2.525 vdc vin=48v, io=10a line regulation 0.02 0.2 %vo vin=36~75v, io=10a load regulation 0.1 0.5 %vo io=0~10a, vin=48v dynamic response 50-75% load 1.5 %vo ta=25c, di/dt = 1a/10s 100 s ta=25c, di/dt = 1a/10s 50-25% load 1.5 %vo ta=25c, di/dt = 1a/10s 100 s ta=25c, di/dt = 1a/10s current limit threshold 11 12.5 14 a short circuit current 17 a efficiency 84 86 % vin=48v, io=10a trim range 90 110 %vo over voltage protection setpoint 3 3.9 v sense compensation 10 %vo 5%vo each leg temperature regulation 0.02 %v o/c ripple (rms) 20 40 mv ( 0 to 20mhz bandwidth ) noise (p-p) 100 150 mv ( 0 to 20mhz bandwidth ) over temperature protection 105 c switching frequency 180 khz a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -6- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com characteristic min typ max units notes
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -7- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com aeh15g48(n) output characteristics power 37.5 w output current 15 a output setpoint voltage 2.475 2.5 2.525 vdc vin=48v, io=15a line regulation 0.02 0.2 %vo vin=36~75v, io=15a load regulation 0.1 0.5 %vo io=0~15a, vin=48v dynamic response 50-75% load 1.5 %vo ta=25c, di/dt = 1a/10s 100 s ta=25c, di/dt = 1a/10s 50-25% load 1.5 %vo ta=25c, di/dt = 1a/10s 100 s ta=25c, di/dt = 1a/10s current limit threshold 16.5 19 21 a short circuit current 20 a efficiency 83 85 % vin=48v, io=15a trim range 90 110 %vo over voltage protection setpoint 3 3.9 v sense compensation 10 %vo 5%vo each leg temperature regulation 0.02 %v o/c ripple (rms) 20 40 mv ( 0 to 20mhz bandwidth ) noise (p-p) 100 150 mv ( 0 to 20mhz bandwidth ) over temperature protection 105 c switching frequency 180 khz characteristic min typ max units notes
aeh20g48(n) output characteristics power 50 w output current 20 a output setpoint voltage 2.475 2.5 2.525 vdc vin=48v, io=20a line regulation 0.02 0.2 %vo vin=36~75v, io=20a load regulation 0.1 0.5 %vo io=0~20a, vin=48v dynamic response 50-75% load 1.5 %vo ta=25c, di/dt = 1a/10s 100 s ta=25c, di/dt = 1a/10s 50-25% load 2.5 %vo ta=25c, di/dt = 1a/10s 100 s ta=25c, di/dt = 1a/10s current limit threshold 22 25 28 a short circuit current 30 a efficiency 85 87 % vin=48v, io=20a trim range 90 110 %vo over voltage protection setpoint 3 3.9 v sense compensation 10 %vo 5%vo each leg temperature regulation 0.02 %v o/c ripple (rms) 20 40 mv ( 0 to 20mhz bandwidth ) noise (pp) 100 150 mv ( 0 to 20mhz bandwidth ) over temperature protection 105 c switching frequency 180 khz a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -8- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com characteristic min typ max units notes
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -9- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com aeh30g48(n) output characteristics power 75 w output current 30 a output setpoint voltage 2.475 2.5 2.525 vdc vin=48v, io=30a line regulation 0.02 0.2 %vo vin=36~75v, io=30a load regulation 0.1 0.5 %vo io=0~30a, vin=48v dynamic response 50-75% load 2.5 %vo ta=25c, di/dt = 1a/10s 100 s ta=25c, di/dt = 1a/10s 50-25% load 2.5 %vo ta=25c, di/dt = 1a/10s 100 s ta=25c, di/dt = 1a/10s current limit threshold 32 36 40 a short circuit current 40 a efficiency 83 85 % vin=48v, io=30a trim range 90 110 %vo over voltage protection setpoint 3 3.9 v sense compensation 10 %vo 5%vo each leg temperature regulation 0.02 %v o/c ripple (rms) 20 40 mv ( 0 to 20mhz bandwidth ) noise (pp) 100 150 mv ( 0 to 20mhz bandwidth ) over temperature protection 105 c switching frequency 180 khz characteristic min typ max units notes
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -10- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com characteristic curves characteristic curves (at 25 (at 25 c) c) typical efficiency aeh10g48n %iomax efficiency (%) 60 65 70 75 80 85 90 0 10 2030 405060 7080 90100 vin=36v vin=48v vin=75v typical efficiency aeh15g48n %iomax efficiency (%) 0 10 203040 50607080 90100 70 74 78 82 86 90 vin=36v vin=48v vin=75v %iomax efficiency (%) 0 10 203040 50607080 90100 70 74 78 82 86 90 vin=36v vin=48v vin=75v %iomax efficiency (%) 0 10 203040 50607080 90100 70 74 78 82 86 90 vin=36v vin=48v vin=75v typical efficiency aeh20g48n typical efficiency aeh30g48n
usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com characteristic curves characteristic curves (at 25 (at 25 c) c) a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w a a a a t t t t t t t t -11- typical output overcurrent characteristics aeh10g48n output voltage (volts) output curent (amps) 0.4 0.8 1.2 1.6 2 2.4 2.8 036 91215 vin=36v vin=48v vin=75v typical output overcurrent characteristics aeh15g48n output voltage (volts) output curent (amps) 0.4 0.8 1.2 1.6 2 2.4 2.8 0 3 6 9 12 15 18 21 vin=36v vin=48v vin=75v output voltage (volts) output curent (amps) 0.4 0.8 1.2 1.6 2 2.4 2.8 0481216202428 vin=36v vin=48v vin=75v output voltage (volts) output curent (amps) 0.4 0.8 1.2 1.6 2 2.4 2.8 0 8 16 24 32 40 vin=36v vin=48v vin=75v typical output overcurrent characteristics aeh20g48n typical output overcurrent characteristics aeh30g48n
characteristic curves characteristic curves (at 25 (at 25 c) c) a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -12- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com typical input-output characteristics aeh10g48n input voltage (volts) input current (amps) 0 0.2 0.4 0.6 0.8 1 020406080 typical input-output characteristics aeh15g48n 0 0.3 0.6 0.9 1.2 1.5 input voltage (volts) input current (amps) 020406080 input voltage (volts) input current (amps) 0 0.4 0.8 1.2 1.6 2 020406080 input voltage (volts) input current (amps) 020406080 0 0.6 1.2 1.8 2.4 3 typical input-output characteristics aeh20g48n typical input-output characteristics aeh30g48n
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -13- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com t t ransient response ransient response (48v rated input voltage, full load, at 25 c) (48v rated input voltage, full load, at 25 c) typical transient response to step load change from 25%-50%-25%iomax aeh10g48n typical transient response to step load change from 25%-50%-25%iomax aeh15g48n typical transient response to step load change from 25%-50%-25%iomax aeh20g48n typical transient response to step load change from 25%-50%-25%iomax aeh30g48n
t t ransient response ransient response (48v rated input voltage, full load, at 25 c) (48v rated input voltage, full load, at 25 c) a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -14- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com typical transient response to step load change from 50%-75%-50%iomax aeh10g48n typical transient response to step load change from 50%-75%-50%iomax aeh15g48n typical transient response to step load change from 50%-75%-50%iomax aeh20g48n typical transient response to step load change from 50%-75%-50%iomax aeh30g48n
characteristic curves characteristic curves (48v rated input voltage, full load, at 25 c) (48v rated input voltage, full load, at 25 c) a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -15- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com typical start-up from power on aeh10g48n typical start-up from power on aeh15g48n typical start-up from power on aeh20g48n typical start-up from power on aeh30g48n
characteristic curves characteristic curves (48v rated input voltage, full load, at 25 c) (48v rated input voltage, full load, at 25 c) a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -16- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com typical shut-down from power off aeh10g48n typical shut-down from power off aeh15g48n typical shut-down from power off aeh20g48n typical shut-down from power off aeh30g48n
characteristic curves characteristic curves (48v rated input voltage, full load, at 25 c) (48v rated input voltage, full load, at 25 c) a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -17- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com typical start-up transient with cnt control aeh10g48n typical start-up transient with cnt control aeh15g48n typical start-up transient with cnt control aeh20g48n typical start-up transient cnt control aeh30g48n
characteristic curves characteristic curves (48v rated input voltage, full load, at 25 c) (48v rated input voltage, full load, at 25 c) a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -18- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com typical shut-down transient with cnt control aeh10g48n typical shut-down transient with cnt control aeh15g48n typical shut-down transient with cnt control aeh20g48n typical shut-down transient with cnt control aeh30g48n
characteristic curves characteristic curves (48v rated input voltage, full load, at 25 c) (48v rated input voltage, full load, at 25 c) a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -19- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com typical output ripple voltage aeh10g48n typical output ripple voltage aeh15g48n typical output ripple voltage aeh20g48n typical output ripple voltage aeh30g48n
characteristic curves characteristic curves (48v rated input voltage, full load, at 25 c) (48v rated input voltage, full load, at 25 c) a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -20- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com overvoltage protection aeh10g48n overvoltage protection aeh15g48n overvoltage protection aeh20g48n overvoltage protection aeh30g48n
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -21- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com pins pins the +vin and -vin input connection pins are located as shown in figure 1. aeh converters have a 2:1 input voltage range and 2.5v output converters can accept 36-75 vdc. care should be taken to avoid applying reverse polarity to the input which can dam- age the converter. input characteristic input characteristic fusing fusing the aeh power module has no internal fuse. an external fuse must always be employed! to meet international safety requirements, a 250 volt rated fuse should be used. if one of the input lines is connected to chassis ground, then the fuse must be placed in the other input line. t t able 1 able 1 standard safety agency regulations require input fusing. recommended fuse ratings for the aeh series are shown in table 1. input reverse v input reverse v oltage protection oltage protection under installation and cabling conditions where reverse polarity across the input may occur, reverse polarity protection is recommended. protection can easily be provided as shown in figure 2. in both cases the diode rating is deter- mined by the power of the converter. diodes should be rated at 20a/100v for 150w, 10a/100v for 100w, 7.5a/100v for 75w, and 5a/100v for 50w. placing the diode across the inputs rather than in-line with the input offers an advan- tage in that the diode only conducts in a reverse polarity condition, which increases circuit efficiency and thermal performance. input undervoltage protection input undervoltage protection the aeh is protected against undervoltage on the input. if the input voltage drops below the acceptable range, the converter will shut down. it will automatically restart when the undervolt- age condition is removed. input filter input filter input filters are included in the converters to help achieve standard system emissions certifi- cations. some users however, may find that additional input filtering is necessary. the aeh 2.5v output series has an internal switching fre- quency of 180khz so a high frequency capaci- tor mounted close to the input terminals pro- -vin case cnt -vout -sense trim +sense +vout +vin component-side footprint fig.1 pin location +vin -vin +vin -vin fig.2 reverse polarity protection circuits rated p out fuse rating 50 watt 5a 75 watt 7.5a 100 watt 10a 150 watt 20a
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -22- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com duces the best results. to reduce reflected noise, a capacitor can be added across the input as shown in figure 3, forming a filter. a 47 f/100v electrolytic capacitor is recom- mended for c1. for conditions where emi is a concern, a differ- ent input filter can be used. figure 4 shows an input filter designed to reduce emi effects. l1 is a 5mh common mode choke. when a filter inductor is connected in series with the power converter input, an input capac- itor c 1 should be added. an input capacitor c 1 should also be used when the input wiring is long, since the wiring can act as an inductor. failure to use an input capacitor under these conditions can produce large input voltage spikes and an unstable output. cnt function cnt function two cnt options are available. negative logic applying a voltage less than 1.2v to the cnt pin will enable the output, and applying a voltage greater than 3v will disable it. positive logic applying a voltage larger than 3v to the cnt pin will enable the output, and applying a voltage less than 1.2v will disable it. positive logic, device code suf fix ? p ? . negative logic, device code suffix nothing is the factory-preferred. if the cnt pin is left open, the converter will default to ? control off ? operation in nega- tive logic, but default to ? control on ? in positive logic. the maximum voltage that can be applied to the cnt pin is 15v. input-output characteristic input-output characteristic safety consideration safety consideration for safety-agency approval of the system in which the power module is used, the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standard, i.e., ul1950, csa c22.2 no. 950-95, and en60950. the +vin -vin c1 fig.3 ripple rejection input filter 1uf 1uf 0.33uf l 1 470u 0.33uf case -vin 1u 1000p 1000p 2200uf/16v 100pf fig.4 emi reduction input filter -v in cnt -v in cnt -v in cnt -v in cnt fig.8 relay control fig.5 simple control fig.6 transistor control fig.7 isolated control
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -23- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com input-to-output 1500vdc isolation is an opera- tional insulation. the dc/dc power module should be installed in end-use equipment, in compliance with the requirements of the ulti- mate application, and is intended to be supplied by an isolated secondary circuit. when the sup- ply to the dc/dc power module meets all the requirements for selv(<60vdc), the output is considered to remain within selv limits (level 3). if connected to a 60vdc power system, dou- ble or reinforced insulation must be provided in the power supply that isolates the input from any hazardous voltages, including the ac mains. one vin pin and one vout pin are to be grounded or both the input and output pins are to be kept floating. single fault testing in the power supply must be performed in combina- tion with the dc/dc power module to demon- strate that the output meets the requirement for selv. the input pins of the module are not operator accessible. note : do not ground either of the input pins of the module, without grounding one of the output pins. this may allow a non-selv voltage to appear between the output pin and ground. case grounding case grounding for proper operation of the module, the case or baseplate of the aeh module does not require a connection to a chassis ground. if the aeh module is not in a metallic enclosure in a sys- tem, it may be advisable to directly ground the case to reduce electric field emissions. leaving the case floating can help to reduce magnetic field radiation from common mode noise cur- rents. if the case has to be grounded for safety or other reasons, an inductor can be connected to chassis at dc and ac line frequencies, but be left floating at switching frequencies. under this condition, the safety requirements are met and the emissions are minimized. output characteristics output characteristics minimum load requirement minimum load requirement there is no minimum load required for the aeh series modules. remote sensing remote sensing the aeh converter can remotely sense both lines of its output which moves the effective out- put voltage regulation point from the output of the unit to the point of connection of the remote sense pins. this feature automatically adjusts the real output voltage of the aeh in order to compensate for voltage drops in distribution and maintain a regulated voltage at the point of load. when the converter is supporting loads far away, or is used with undersized cabling, sig- nificant voltage drop can occur at the load. the best defense against such drops is to locate the load close to the converter and to ensure ade- quately sized cabling is used. when this is not possible, the converter can compensate for a drop of up to 0.5v, through use of the sense leads. when used, the + and - sense leads should be connected from the converter to the point of load as shown in figure 9 using twisted pair wire. the converter will then regulate its output voltage at the point where the leads are con- nected. care should be taken not to reverse the sense leads. if reversed, the converter will trig- ger ovp protection and turn off. when not +v out -v out load +sense -sense twisted pair +s -s fig.9 sense connections
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -24- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com used, the +sense lead must be connected with +vo, and -sense with -vo. also note that the output voltage and the remote sense voltage offset must be less than the minimum overvolt- age trip point. note that at elevated output voltages the maximum power rating of the module remains the same, and the output current capability will decrease correspond- ingly. output t output t rimming rimming users can increase or decrease the output volt- age set point of a module by connecting an external resistor between the trim pin and either the sense (+ ) or sense ( - ) pins. the trim resistor should be positioned close to the module. if not using the trim feature, leave the trim pin open. trimming up by more than 10% of the nominal output may damage the converter or trig the ovp protection. trimming down more than 10% can cause the converter to regulate improperly. trim down and trim up circuits and the corresponding configuration are shown in figure 10 to figure 13. note that at elevated output voltages the maximum power rating of the module remains the same, and the output current capability will decrease correspondingly. output over-current protection output over-current protection aeh series dc/dc converters feature foldback current limiting as part of their overcurrent protection (ocp) circuits. when output current exceeds 110 to 140% of rated current, such as during a short circuit condition, the output will shutdown immediately, and can tolerate short circuit conditions indefinitely. when the over- current condition is removed, the converter will automatically restart. 0 10 20 30 40 50 60 70 80 90 100 01 234 5678 910 % change in output voltage (y) adjustment resistor value (k ? ) vo(100+y) r adj-up = (100+2y) 1.26y y - +vin -vin cnt case +vout -vout sense(+) trim sense(?) r adj-up r load where y is the adjusting percentage of the voltage. 0 < y < 10 radj-up is in k ? . fig.11 resistor selection for trimming up 2.5v outputs fig.10 circuit configuration and equation to trim up output voltage r adj-down = where y is the adjusting percentage of the voltage. 0 < y < 10 radj-down is in k ? . r adj-down r load 100 y - 2 +vin -vin cnt case +vout -vout sense(+) trim sense( ? ) % change in output voltage (y) adjustment resistor value (k ? ) 0 10 20 30 40 50 60 70 80 90 100 01 23 456 78 910 fig.13 resistor selection for trimming down output voltage fig.12 circuit configuration and equation to trim down output voltage
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -25- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com output filters output filters when the load is sensitive to ripple and noise, an output filter can be added to minimize the effects. a simple output filter to reduce output ripple and noise can be made by connecting a capacitor across the output as shown in figure 14. the recommended value for the output capacitor c1 is 2,200 f/10v. extra care should be taken when long leads or traces are used to provide power to the load. long lead lengths increase the chance for noise to appear on the lines. under these con- ditions c2 can be added across the load as shown in figure 15. the recommended compo- nent for c2 is 2200 f/10v capacitor and con- necting a 0.1 f ceramic capacitor c1 in paral- lel generally. decoupling decoupling noise on the power distribution system is not always created by the converter. high speed analog or digital loads with dynamic power demands can cause noise to cross the power inductor back onto the input lines. noise can be reduced by decoupling the load. in most cases, connecting a 10 f tantalum capacitor in paral- lel with a 0.1 f ceramic capacitor across the load will decouple it. the capacitors should be connected as close to the load as possible. ground loops ground loops ground loops occur when different circuits are given multiple paths to common or earth ground, as shown in figure 16. multiple ground points can slightly different potential and cause current flow through the circuit from one point to another. this can result in additional noise in all the circuits. to eliminate the problem, circuits should be designed with a single ground con- nection as shown in figure 17. output over-v output over-v oltage protection oltage protection the over-voltage protection has a separate feedback loop which activates when the output voltage is between 120% and 140% of the nominal output voltage. when an over-voltage condition occurs, a ? turn off ? signal was sent to the input of the module, and shut off the out- put. the module will restart after power on again. +v out -v out load c 1 c 2 fig.15 output ripple filter for a distant load +v out -v out load c 1 fig.14 output ripple filter +vout -vout load load r line r line r line r line r line r line ground loop fig.16 ground loops fig.17 single point ground +vout -vout load load r line r line r line r line r line
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -26- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com parallel power distribution parallel power distribution figure 18 shows a typical parallel power distri- bution design. such designs, sometimes called daisy chains, can be used for very low output currents, but are not normally recommended. the voltage across loads far from the source can vary greatly depending on the ir drops along the leads and changes in the loads clos- er to the source. dynamic load conditions increase the potential problems. radial power distribution radial power distribution radial power distribution is the preferred method of providing power to the load. figure 19 shows how individual loads are connected directly to the power source. this arrangement requires additional power leads, but it avoids the voltage variation problems associated with the parallel power distribution technique. mixed distribution mixed distribution in the real world a combination of parallel and radial power distribution is often used. dynamic and high current loads are connected using a radial design, while static and low current loads can be connected in parallel. this combined approach minimizes the drawbacks of a parallel design when a purely radial design is not feasi- ble. redundant operation redundant operation a common requirement in high reliability sys- tems is to provide redundant power supplies. the easiest way to do this is to place two con- verters in parallel, providing fault tolerance but not load sharing. oring diodes should be used to ensure that failure of one converter will not cause failure of the second. figure 21 shows such an arrangement. upon application of power, one of the converters will provide a slightly higher output voltage and will support the full load demand. the second converter will see a zero load condition and will ?idle?. if the first converter should fail, the second converter will support the full load. when designing redundant converter circuits, shottky diodes should be used to minimize the forward voltage drop. the voltage drop across the shottky diodes must also be considered when deter- mining load voltage requirements. load 1 load 2 load 3 +vout -vout r l1 r l2 r l3 r g1 r g2 r g3 r l = lead resistance r g = ground lead resistance fig.19 radial power distribution load 1 load 2 load 3 +vout -vout r l1 r l2 r l3 r g1 r g2 r g3 i 1 + i 2 + i 3 i 2 + i 3 i 3 r l = lead resistance r g = ground lead resistance fig.18. parallel power distribution load 1 load 2 load 3 +vout -vout r l1 r l2 r l3 r g1 r g2 r g3 r l = lead resistance r g = ground lead resistance load 4 r l4 r g4 fig.20 mixed power distribution +v out -v out +v out -v out load fig.21 redundant operation
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -27- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com thermal management thermal management t t echnologies echnologies aeh series 50 w to 150 w modules feature high efficiency and the 2.5 v output units have typical efficiency of 86% at full load. with less heat dissipation and temperature-resistant components such as ceramic capacitors, these modules exhibit good behavior during pro- longed exposure to high temperatures. maintaining the operating case temperature (tc) within the specified range help keep inter- nal-component temperatures within their speci- fications which in turn help keep mtbf from falling below the specified rating. proper cool- ing of the power modules is also necessary for reliable and consistent operation. basic thermal management basic thermal management measuring the case temperature of the module (tc) as the method shown in figure 22 can ver- ify the proper cooling. figure 22 shows the metal surface of the module and the pin loca- tions. the module should work under 90c for the reliability of operation and t c must not exceed 100 c while operating in the final sys- tem configuration. the measurement can be made with a surface probe after the module has reached thermal equilibrium. if a heat sink is mounted to the case, make the measurement as close as possible to the indicated position. it makes the assumption that the final system configuration exists and can be used for a test environment. the following text and graphs show guidelines to predict the thermal performance of the mod- ule for typical configurations that include heat sinks in natural or forced airflow environments. note that tc of module must always be checked in the final system configuration to verify proper operational due to the variation in test condi- tions. thermal management acts to transfer the heat dissipated by the module to the surrounding environment. the amount of power dissipated by the module as heat (p d ) is got by the equa- tion below: p d = p i ? p o where : p i is input power; p o is output power; p d is dissipated power. also, module efficiency ( ) is defined as the fol- lowing equation: = p o / p i if eliminating the input power term, from two above equations can yield the equation below: p d = p o (1- ) / the module power dissipation then can be cal- culated through the equation. because each power module output voltage has a different power dissipation curve, a plot of power dissipation versus output current over three different line voltages is given in each module-specific data sheet. the typical power dissipation curve of aeh series 2.5v output are shown as figure 23 to figure 26. 29.0 (1.14) 30.5 (1.2) cnt case +sense trim ? sense +vin measure case temperature here base-plate side view dimensions: millimeters (inches) -vin +vout -vout fig.22 case temperature measurement
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -28- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com module derating module derating experiment setup experiment setup from the experimental set up shown in figure 27, the derating curves as figure 28 can be drawn. note that the pwb ( printed-wiring board ) and the module must be mounted verti- cally. the passage has a rectangular cross- section. the clearance between the facing pwb and the top of the module is kept 13 mm (0.5 in.) constantly. output current (a) power dissipation (w) 2.5 4.5 6.5 8.5 10.5 12.5 14.5 16.5 0 3 6 9 12151821242730 vin=36v vin=48v vin=75v fig.26 aeh30g48 power dissipation curves 2 2.5 3 3.5 4 4.5 5 012 34567 8910 output current (a) vin=36v vin=48v vin=75v power dissipation (w) fig.23 aeh10g48 power dissipation curves 2 3 4 5 6 7 8 9 output current (a) power dissipation (w) vin=36v vin=48v vin=75v 0 1.5 3 4.5 6 7.5 9 10.5 12 13.5 15 fig.24 aeh15g48 power dissipation curves output current (a) power dissipation (w) 2 3 4 5 6 7 8 9 vin=36v vin=48v vin=75v 0 2 4 6 8 10 12 14 16 18 20 fig.25 aeh20g48 power dissipation curves 0 10203040 100 0 21 local ambient temperature, t a (c) power dissipation , p d (w) 15 12 6 90 80 70 60 50 4.0 m/s (800 ft./min.) 0.1 m/s (20 ft./min.) natural convection 1.0 m/s (200 ft./min.) 2.0 m/s (400 ft./min.) 3.0 m/s (600 ft./min.) 3 9 18 1.5 m/s (300 ft./min.) 0.5 m/s (100 ft./min.) fig.28 forced convection power derating without heat sink dimensions: millimeters (inches). air velocity and ambient temperature measured below the module airflow 19 (0.75) facing pwb module pwb 76 (3.00) fig.27 experiment set up
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -29- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com convection w convection w ithout heat sinks ithout heat sinks heat transfer can be enhanced by increasing the airflow over the module. figure 28 shows the maximum power that can be dissipated by the module. in the test, natural convection airflow was mea- sured at 0.05 m/s to 0.1 m/s (10 ft./min. to 20 ft./min.). the 0.5 m/s to 4.0 m/s (100 ft./min. to 800 ft./min.) curves are tested with externally adjustable fans. the appropriate airflow for a given operating condition can be determined through figure 28. example 1. how to calculate the minimum airflow required to maintain a desired tc? if a aeh30g48 module operates with a 48v line voltage, a 30 a output current, and a 40 c maximum ambient temperature, what is the minimum airflow necessary for the operating? determine p d ( referenced fig.26 ) with con- dition: v in = 48 v l o = 30 a get: p d = 13.5 w and with t a = 40 c determine airflow ( fig.28. ): v = 1.5 m/s (300 ft./min.) example 2. how to calculate the maximum output power of a module in a certain con- vection and a max. t a ? what is the maximum power output for a aeh30g48 operating at following conditions: vin = 48 v v = 1.5 m/s (300 ft./min.) t a = 40 c determine p d ( fig.28 ) p d = 14.5w determine i o ( fig.26 ): i o = 30 a calculate p o : p o = (v o ) x (i o ) = 2.5 x 30 = 75 w although the two examples above use 100 c as the maximum case temperature, for extremely high reliability applications, one may design to a lower case temperature as shown in example 4. heat sink configuration heat sink configuration several standard heat sinks are available for the aeh 50 w to 150 w modules as shown in figure 29 to figure 31. the heat sinks mount to the top surface of the module with screws torqued to 0.56 n-m (5 in.- 57.9 (2.28) 61 (2.4) 1 in. (wdl10040) 1 1/2 in. (wdl15040) 1/4 in. (wdl02540) 1/2 in. (wdl05040) fig.30 longitudinal fins heat sink 1 in. (wdt10040) 1 1/2 in. (wdt15040) 61 (2.4) 1/4 in. (wdt02540) 1/2 in. (wdt05040) 57.9 (2.28) fig.31 transverse fins heat sink 89.1(3.51) 57.0 (2.24) 11.8 (0.465) 4.9(0.193) dimensions: millimeters (inches). fig.29 non standard heatsink
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -30- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com lb). a thermally conductive dry pad or thermal grease is placed between the case and the heat sink to minimize contact resistance (typi- cally 0.1 c/w to 0.3 c/w) and temperature dif- ferential. nomenclature for heat sink configurations is as follows: wdxyyy40 where: x = fin orientation: longitudinal (l) or trans verse (t) yyy = heat sink height (in 100ths of inch) for example, wdt5040 is a heat sink that is transverse mounted (see figure 31) for a 61 mm x 57.9 mm (2.4 in.x 2.28 in.) module with a heat sink height of 0.5 in. heatsink mounting advice heatsink mounting advice a crucial part of the thermal design strategy is the thermal interface between the baseplate of the module and the heatsink. inadequate mea- sures taken here will quickly negate any other attempts to control the baseplate temperature. for example, using a conventional dry insulator can result in a case-heatsink thermal imped- ance of >0.5 c/w, while use one of the rec- ommended interface methods (silicon grease or thermal pads available from astec) can result in a case-heatsink thermal impedance around 0.1c/w. natural convection with heat sink natural convection with heat sink the power derating for a module with the heat sinks ( shown as figure 23 to figure 26) in nat- ural convection is shown in figure 33. in this test, natural convection generates airflow about 0.05 m/s to 0.1 m/s ( 10ft./min to 20ft./min ). figure 33 can be used for heat-sink selection in natural convection environment. example 3. how to select a heat sink ? what heat sink would be appropriate for a aeh30g48 in a natural convection environ- ment at nominal line, 2/3 load, and maximum ambient temperature of 40c? determine p d ( referenced fig.26 ) with con- dition: v in = 48 v i o = 2/3 (30) = 20 a t a = 40 c get: p d = 7.5 w determine heat sink (fig.33.): no heat sink allows up to t a = 50 c 1/4 in. allows up to t a = 60 c fig.32 heat sink mounting 0 10203040 90100 0 20 25 30 35 local ambient temperature, t a (c) power dissipation, p d (w) 15 10 5 50 60 70 80 1 1/2 in. 1 in. 1/2 in. 1/4 in. none fig.33 heat sink power derating curves, natural convection
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -31- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com basic thermal model basic thermal model there is another approach to analyze module thermal performance, to model the overall ther- mal resistance of the module. this presentation method is especially useful when considering heat sinks. the following equation can be used to calculate the total thermal resistance . r ca = ? t c , max / p d where r ca is the module thermal resistance, ? t c , max is the maximum case temperature rise, p d is the module power dissipation. in this model, p d , ? t c, max , and r ca are equals to current flow, voltage drop, and electrical resistance, respectively, in ohm's law, as shown in figure 34. also, ? t c, max is defined as the difference between the module case tem- perature (t c ) and the inlet ambient temperature (t a ). ? t c , max = t c ? t a where t c is the module case temperature; t a is the inlet ambient temperature. for aeh series 50w to 150w 2.5v output con- verters, the module's thermal resistance values versus air velocity have been determined experimentally and shown in figure 35. the highest values on each curve represents the point of natural convection. figure 35 is used for determining thermal per- formance under various conditions of airflow and heat sink configurations. example 4. how to determine the allowable minimum airflow to heat sink combinations necessary for a module under a desired tc and a certain condition? although the maximum case temperature for the aeh series converters is 100 c, you can improve module reliability by limiting tc,max to a lower value. how to decide? for example, what is the allowable minimum airflow for aeh 150w heat sink combinations at desired tc of 80 c? the working condition is as following: v in = 48 v, i o = 30 a, t a = 40 c determine p d ( fig.26 ) p d = 13.5 w then solve r ca : : r ca = ? t c , max / p d r ca = ( t c ? t a ) / p d r ca = ( 80 ? 40 ) / 13.5 = 3c/w determine air velocity from figure 35: if no heat sink: v = 2.6 m/s (520 ft./min.) if 1/4 in. heat sink: v = 1.8 m/s (360 ft./min.) if 1/2 in. heat sink: v = 1.1 m/s (220 ft./min.) if 1 in. heat sink: v = 0.4 m/s (80 ft./min.) bmpm p d = bmpm thermal resistance fig.34 basic thermal resistance model 0 0.5 (100) 1.0 (200) 1.5 (300) 2.0 (400) 2.5 (500) 3.0 (600) 0 1 5 6 7 8 air velocity m/s (ft./min.) 4 3 2 case-ambient thermal resistance r ca (c/w) 1 in. heat sink 1/2 in. heat sink 1/4 in. heat sink no heat sink fig.35. case-to-ambient thermal resistance curves; either orientation
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -32- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com example 5. how to determine case tempera- ture ( tc ) for the various heat sink configu- rations at certain air velocity? what is the allowable tc for aeh 150w heat sink configurations at desired air velocity of 2.0 m/s, and it is operating at a 48 v line voltage, a 30 a output current, a 40 c maximum ambient temperature? determine p d ( fig.26 ) with condition: v in = 48 v i o = 30 a t a = 40 c v = 2.0 m/s (400 ft./min.) get: p d = 13.5 w determine t c : t c = (r ca x p d ) + t a determine the corresponding thermal resis- tances ( r ca ) from figure 35: no heat sink: r ca = 3.8 c/w t c = (3.8 x 13.5) + 40 = 91 c 1/4 in. heat sink: r ca = 2.8 c/w t c = (2.8 x 13.5) + 40 = 78 c 1/2 in. heat sink: r ca = 2.0 c/w t c = (2.0 x 13.5) + 40 = 66 c 1 in. heat sink: r ca = 1.2 c/w t c = (1.2 x 13.5) + 40 = 56 c in this configuration, the heat sink would not need and the power module does not exceed the maximum case temperature of 100 c. aeh series mechanical aeh series mechanical considerations considerations installation installation although aeh series converters can be mount- ed in any orientation, free air-flowing must be taken. normally power components are always put at the end of the airflow path or have the separate airflow paths. this can keep other system equipment cooler and increase compo- nent life spans. soldering soldering aeh series converters are compatible with standard wave soldering techniques. when wave soldering, the converter pins should be preheated for 20-30 seconds at 110 c, and wave soldered at 260c for less than 10 sec- onds. when hand soldering, the iron temperature should be maintained at 4 25c and applied to the converter pins for less than 5 seconds. longer exposure can cause internal damage to the converter. cleaning can be performed with cleaning solvent ipa or with water. mtbf mtbf the mtbf, calculated in accordance with bellcore tr-nwt-000332 is 2,080,000 hours. obtaining this mtbf in practice is entirely pos- sible. if the ambient air temperature is expected to exceed +25c, then we also advise a heatsink on the aeh, oriented for the best pos- sible cooling in the air stream. astec can supply replacements for converters from other manufacturers, or offer custom solu- tions. please contact the factory for details.
a a a a e e e e h h h h h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 2 2 2 2 . . . . 5 5 5 5 v v v v o o o o u u u u t t t t p p p p u u u u t t t t , , , , 5 5 5 5 0 0 0 0 - - 1 1 1 1 5 5 5 5 0 0 0 0 w w w w -33- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com recommend hole pattern recommend hole pattern base-plate side view dimensions are in millimeters and (inches). 10.16 (0.400) 10.16 (0.400) 12.7 (0.50) 48.3 (1.90) 48.26 (1.900) 4.8 (0.19) mounting inserts module outline 5.1 (0.20) 57 . 9 (2 . 28) max 17.78 (0.700) 25.40 (1.000) 35.56 (1.400) 25.40 (1.000) 50.8 (2.00) 35.56 (1.400) 61.0 (2.40) -vout -vin ?sense trim +sense case cnt +vin +vout max mechanical chart mechanical chart -vin case cnt +vin +vout +sense trim -sense -vout 5.1 (0.2) 10.16 (0.4) 15.24 (0.6) 4.8 (0.19) 48.26 (1.9) 10.16 (0.4) 10.16 (0.4) 10.16 (0.4) 7.62 (0.3) 7.62 (0.3) 7.62 (0.3) 57.9 (2.28) 61.0 (2.4) mm (inches) 7- 12.7 (0.5) mounting inserts m3 thru hole x4 2- 2.0 (0.08) only +vo and -vo 1.0 (0.04) all pins except +vo and -vo length optional 4.8 (0.189) default base-plate side view tolerances: inches millimeters .xx ! 0.020 .x ! 0.5 .xxx ! 0.010 .xx ! 0.25 pins >4mm ! 0.02inch ( ! 0.5mm) <4mm ! 0.01inch ( ! 0.25mm) pin length option 4.80mm ! 0.5mm 0.189in. ! 0.020in. 3.80mm ! 0.25mm 0.150in. ! 0.010in. 5.80mm ! 0.5mm 0.228in. ! 0.02in. 2.80mm ! 0.25mm 0.110in. ! 0.010in. device code suffix none (default) -6 -7 -8
part number description ss pp c -0 iv l- xxx f yy h n - p - mx -options p = pin length omit this digit for standard 5mm 6 = 3.8mm, 7= 5.8mm iv = input voltage 8 = 2.8mm 05 = range centered on 5v 12 = range centered on 12v enable logic polarity 24 = 18 to 36(2:1), 9 to 36v(4:1) omit for positive enable logic 36 = 20 to 60v n = negative enable 46 = 18v to 75v (4:1) except: ak60c-20h, bk60c-30h 48 = typ 36 to 75v omit for negative logice p = positive logic c = pinout compatability a= astec footprint or "non lucent" footprint h = high efficiency (synch rect.) c= ind std, exact lucent drop in omit h if conventional diode (low eff) yy = output current pp = package type ie. 08 = 8 amps 40 = 1" x 2" smd 42 = 1.5" x 2" smd f = # of outputs 45 = 1.45" x 2.3" (1/4 brk) f = single output 60 = 2.4" x 2.3" (1/2 brk) d = dual output 80 = full size 4.6" x 2.4" 72= 2.35" x 3.3 (3/4 brk) xxx = output voltage format is xx.x (ie 1.8v = 018) ss = series aa = 1/2brick dual (old designator) ak = ind std sizes (1/4, 1/2, full) <150w mx = options am/bm = full size, astec pin out m1,m2 = .25" height heatsink al = half size, astec pin-out m3,m4 = .5" height heatsink bk = ind std size =>150w or feature rich m5.m6 = 1.0" height heatsink av = avansys product note: for some products, they may not conform with the part number description above absolutely. revision q attachment i page 1 of 2
new part number description acs ii v 1 v 2 v 3 v in - e t p mx output voltage a = 5.0v e = 7.5v f = 3.3v b = 12v, c = 15v g = 2.5v l = 8v , h = 24v, r = 28v d = 2.0v / 2.1v omit v2 and v3 if single output y = 1.8v omit v3 if dual output m = 1.5v ie for dual output 5 and 3.3v k = 1.2v v1 =a, v2 = f, v3 =omit j = 0.9v v1 =a, v2 = f, v3 =omit ii = output current max ie 60 = 60 amps vin = input voltage range 300 = 250v to 450v s = size 48 = 36v to 75v f = full brick 24 = 18v to 36v h = half brick 03 = 1.8v to 5.0v q = quarter brick 08 = 5.0v to 13.0v s = 1 x 2 18 pin smt pfc: power factor corrected e = 1 x 2 thru hole c = (.53x1.3x.33) smt (austin lite drop in) e = enable logic for > 15w v = conventional package (2x2.56") or ( omit this digit for positive enable a = sip n = negative logic w = convent pkg (wide 2.5x3) e = enable logic for < 15w r = 1 x 1 thru hole omit this digit for no enable option a = sip 1 = negative logic t = 1.6 x 2 4 = positive logic c = construction trim for 1w to 15w e = enhanced thermals (baseplate or adapter plate) 9 = trim added i = integrated (full featured) hong kong models l = low profile (open frame, no case - isolated) p = open frame (sip or smt) non-isolated p = pin length omit this digit for standard 5mm 6 = 3.8mm 8 = 2.8mm 7 = 5.8 mm mx - factory options customer specific note: for some products, they may not conform with the new part number description above absolutely. revision q attachment i page 2 of 2

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