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www.irf.com 1 hybrid-high reliabilitydc-dc converter ahf28xx series description features ahf 28v input, single and dual output the proprietary magnetic feedback circuit provides foran extremely wide bandwidth control loop with a high phase margin. the closed loop frequency response of this converter family extends to approximately 50khz, resulting in superior line and load transient characteristics. this feedback method is also inherently temperatureand radiation insensitive. this gives the ahf series an important advantage over converters that incorporate opto-couplers in their design. the ahf series of dc-dc converters feature single ordual outputs over the full military temperature range. no derating in output power is required, making them suitable for use in rugged military applications. the low profile, small outline package is ideally suited to the tight board space requirements of many industrial and aerospace applications. designed for nominal 28vdc inputs, this family of converters will meet the requirements of mil-std-704d. the basic circuit utilizes a pulse width modulated, feed-forward topology at a nominal switching frequency of 550khz. input to output isolation is achieved through the use of transformers in the forward and feedback circuits. extensive computer simulation using complex modeling enables rapid design modification to be provided.contact ir san jose with specific requirements. 16v to 40vdc input range (28 vdc nominal) single and dual outputs 12w output power 22.8w/in3 power density low input / output noise (50ma/60mvp-p max. respectively) indefinite short circuit and overload protection wideband control loop for superior transient characterstics no derating for -55c to +125c operation constant switching frequency (550khz nominal) standard microcircuit drawings available manufactured in a facility fully qualified to mil-prf- 38534, these converters are fabricated utilizing dscc qualified processes. for available screening options, refer to device screening table in the data sheet. variations are electrical, mechanical and screening can be accommodated. pd-94541d downloaded from: http:///
2 www.irf.com ahf28xx series specifications AHF2803R3S input voltage -0.5v to +50v soldering temperature 300c for 10 seconds operating case temperature -55c to +125c storage case temperature -65c to +135c absolute maximum ratings for notes to specifications, refer to page 3 table i. electrical performance characteristics test symbol conditions group a device unit -55c tc +125c subgroups types vin = 28vdc 5%, c l = 0 unless otherwise specified min max 1 3.26 3.34 2,3 3.23 3.36 output current 1 i out v in = 16, 28, and 40vdc 1,2,3 01 3000 ma v in = 16, 28, and 40vdc, b.w. = 20 hz to 2mhz v in = 16, 28, and 40vdc, line regulation vr line iout = 0%, 50% and 100% 1,2,3 01 25 mv rated load v in = 16, 28, and 40vdc, load regulation vr load i out = 0%, 50% and 100% 1,2,3 01 50 mv rated load i out = 0, inhibit (pin 1) tied to input return (pin 7) i out = 0, inhibit (pin 1) = open i out = 100% rated load b.w. = 20 hz to 2.0mhz 17 2 2,3 70 input to output or any pin isolation iso to case (except pin 6) 1 01 100 m ? at 500vdc, tc = +25c no effect on dc performance, tc = +25c power dissipation overload 5 10 1 6 . 0 load fault short circuit 1,2,3 01 2.0 switching frequency f s i out = 100% rated load 4,5,6 01 500 600 khz 01 500 f p d w ma ma p-p efficiency e ff i out = 100% rated load 01 % input ripple current 2 i rip 1,2,3 01 v 01 60 mv p-p input current 01 12 01 capacitive load 3, 4 c l 4 output voltage v out i out = 0 output ripple voltage 2 v rip i in 1,2,3 1,2,3 limits 50 30 downloaded from: http:///
www.irf.com 3 ahf28xx series table i. electrical performance characteristics - continued 1. parameter guaranteed by line and load regulation tests.2. bandwidth guaranteed by design. tested for 20khz to 2.0mhz. 3. capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn-on. 4. parameter shall be tested as part of design characterization and after design or process changes. thereafter, parameters shall be guaranteed to the limits specified in table i. 5. an overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. 6. load step transition time between 2.0 s and 10 s. 7. recovery time is measured from the initiation of the transient to where v out has returned to within 1.0 percent of v out at 50 percent load. 8. input step transition time between 2.0 s and 10 s. 9. turn-on delay time measurement is for either a step application of power at the input or the removal of ground signal from the inhibit pin (pin 1) while power is applied to the input is unlimited. notes to specifications AHF2803R3S test symbol conditions group a device unit -55c tc +125c subgroups types vin = 28vdc 5%, c l = 0 unless otherwise specified min max 50% to/from 100% rated load 0% to/from 50% rated load 50% to/from 100% rated load 4,5,6 70 s 0% to/from 50% rated load 4,5,6 1200 s 50% to/from 0% rated load 4,5,6 8.0 ms input step 16v to/from 40vdc, i out = 100% 4,5,6 500 mvpk rated load 4, 8 input step 16v to/from 40vdc, i out = 100% 4,5,6 800 s rated load 4, 7, 8 turn on overshoot vton os i out = o and 100% rated load 4,5,6 01 600 mvpk turn on delay ton d i out = o and 100% rated load 9 4,5,6 01 20 ms load fault recovery 4, 9 weight 38 g 01 output response to transient step line changes vo tline 01 output response to step transient load changes 6 vo tload recovery time step transient load changes 6, 7 tt load +300 -500 +500 mvpk limits recovery time transient step line changes tt line 01 4,5,6 4,5,6 01 -300 ms tr lf 4,5,6 01 20 downloaded from: http:///
4 www.irf.com ahf28xx series specifications for notes to specifications, refer to page 5 table ii. electrical performance characteristics ahf2805s input voltage -0.5v to +50v soldering temperature 300c for 10 seconds operating case temperature -55c to +125c storage case temperature -65c to +135c absolute maximum ratings test symbol conditions group a device unit -55c tc +125c subgroups types vin = 28vdc 5%, c l = 0 unless otherwise specified min max 1 4.95 5.05 2,3 4.90 5.10 output current 1 i out v in = 16, 28, and 40vdc 1,2,3 01 2400 ma v in = 16, 28, and 40vdc, b.w. = 20 hz to 2mhz v in = 16, 28, and 40vdc, line regulation vr line iout = 0%, 50% and 100% 1,2,3 01 25 mv rated load v in = 16, 28, and 40vdc, load regulation vr load i out = 0%, 50% and 100% 1,2,3 01 50 mv rated load i out = 0, inhibit (pin 1) tied to input return (pin 7) i out = 0, inhibit (pin 1) = open i out = 100% rated load b.w. = 20 hz to 2.0mhz 17 6 2,3 74 input to output or any pin isolation iso to case (except pin 6) 1 01 100 m ? at 500vdc, tc = +25c no effect on dc performance, tc = +25c power dissipation overload 5 10 1 6 . 0 load fault short circuit 1,2,3 01 2.0 switching frequency f s i out = 100% rated load 4,5,6 01 500 600 khz limits 50 30 i in 1,2,3 1,2,3 output voltage v out i out = 0 output ripple voltage 2 v rip input current 01 12 01 capacitive load 3, 4 c l 4 01 v 01 60 mv p-p ma ma p-p efficiency e ff i out = 100% rated load 01 % input ripple current 2 i rip 1,2,3 01 500 f p d w downloaded from: http:///
www.irf.com 5 ahf28xx series table ii. electrical performance characteristics - continued notes to specifications ahf2805s 1. parameter guaranteed by line and load regulation tests.2. bandwidth guaranteed by design. tested for 20khz to 2.0mhz. 3. capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn-on. 4. parameter shall be tested as part of design characterization and after design or process changes. thereafter, parameters shall be guaranteed to the limits specified in table i. 5. an overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. 6. load step transition time between 2.0 s and 10 s. 7. recovery time is measured from the initiation of the transient to where v out has returned to within 1.0 percent of v out at 50 percent load. 8. input step transition time between 2.0 s and 10 s. 9. turn-on delay time measurement is for either a step application of power at the input or the removal of ground signal from the inhibit pin (pin 1) while power is applied to the input is unlimited. test symbol conditions group a device unit -55c tc +125c subgroups types vin = 28vdc 5%, c l = 0 unless otherwise specified min max 50% to/from 100% rated load 0% to/from 50% rated load 50% to/from 100% rated load 4,5,6 70 s 0% to/from 50% rated load 4,5,6 1200 s 50% to/from 0% rated load 4,5,6 8.0 ms input step 16v to/from 40vdc, i out = 100% 4,5,6 500 mvpk rated load 4, 8 input step 16v to/from 40vdc, i out = 100% 4,5,6 800 s rated load 4, 7, 8 turn on overshoot vton os i out = o and 100% rated load 4,5,6 01 600 mvpk turn on delay ton d i out = o and 100% rated load 9 4,5,6 01 20 ms load fault recovery 4, 9 weight 38 g ms tr lf 4,5,6 01 20 limits recovery time transient step line changes tt line 01 4,5,6 4,5,6 01 -300 +300 -500 +500 mvpk output response to step transient load changes 6 vo tload recovery time step transient load changes 6, 7 tt load 01 output response to transient step line changes vo tline 01 downloaded from: http:///
6 www.irf.com ahf28xx series specifications ahf2812s table iii. electrical performance characteristics for notes to specifications, refer to page 7 input voltage -0.5v to +50v soldering temperature 300c for 10 seconds operating case temperature -55c to +125c storage case temperature -65c to +135c absolute maximum ratings test symbol conditions group a device unit -55c tc +125c subgroups types vin = 28vdc 5%, c l = 0 unless otherwise specified min max 1 11.88 12.12 2,3 11.76 12.24 output current 1 i out v in = 16, 28, and 40vdc 1,2,3 01 1000 ma v in = 16, 28, and 40vdc, b.w. = 20 hz to 2mhz v in = 16, 28, and 40vdc, line regulation vr line iout = 0%, 50% and 100% 1,2,3 01 50 mv rated load v in = 16, 28, and 40vdc, load regulation vr load i out = 0%, 50% and 100% 1,2,3 01 50 mv rated load i out = 0, inhibit (pin 1) tied to input return (pin 7) i out = 0, inhibit (pin 1) = open i out = 100% rated load b.w. = 20 hz to 2.0mhz 17 8 2,3 75 input to output or any pin isolation iso to case (except pin 6) 1 01 100 m ? at 500vdc, tc = +25c no effect on dc performance, tc = +25c power dissipation overload 5 10 1 6 . 0 load fault short circuit 1,2,3 01 2.0 switching frequency f s i out = 100% rated load 4,5,6 01 500 600 khz 01 500 f p d w ma ma p-p efficiency e ff i out = 100% rated load 01 % input ripple current 2 i rip 1,2,3 01 v 01 60 mv p-p input current 01 12 01 capacitive load 3, 4 c l 4 output voltage v out i out = 0 output ripple voltage 2 v rip i in 1,2,3 1,2,3 limits 50 50 downloaded from: http:///
www.irf.com 7 ahf28xx series table iii. electrical performance characteristics - continued ahf2812s notes to specifications1. parameter guaranteed by line and load regulation tests. 2. bandwidth guaranteed by design. tested for 20khz to 2.0mhz. 3. capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn-on. 4. parameter shall be tested as part of design characterization and after design or process changes. thereafter, parameters shall be guaranteed to the limits specified in table ii. 5. an overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. 6. load step transition time between 2.0 s and 10 s. 7. recovery time is measured from the initiation of the transient to where v out has returned to within 1.0 percent of v out at 50 percent load. 8. input step transition time between 2.0 s and 10 s. 9. turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin 1) while power is applied to the input is unlimited. test symbol conditions group a device unit -55c tc +125c subgroups types vin = 28vdc 5%, c l = 0 unless otherwise specified min max 50% to/from 100% 4 -300 +300 rated load 5,6 -450 +450 0% to/from 50% 4 -500 +500 rated load 5,6 -750 +750 50% to/from 100% rated load 4,5,6 100 s 0% to/from 50% rated load 4,5,6 1500 s 50% to/from 0% rated load 4,5,6 10 ms input step 16v to/from 40vdc, i out = 100% 4,5,6 1500 mvpk rated load 4, 8 input step 16v to/from 40vdc, i out = 100% 4,5,6 800 s rated load 4, 7, 8 turn on overshoot vton os i out = o and 100% rated load 4,5,6 01 600 mvpk turn on delay ton d i out = o and 100% rated load 9 4,5,6 01 20 ms load fault recovery 4, 9 weight 38 g vo tline 01 mvpk limits recovery time transient step line changes tt line 01 01 output response to step transient load changes 6 vo tload recovery time step transient load changes 6, 7 tt load 01 output response to transient step line changes ms tr lf 4,5,6 01 20 downloaded from: http:///
8 www.irf.com ahf28xx series specifications table iv. electrical performance characteristics ahf2815s for notes to specifications, refer to page 9 input voltage -0.5v to +50v soldering temperature 300c for 10 seconds operating case temperature -55c to +125c storage case temperature -65c to +135c absolute maximum ratings test symbol conditions group a device unit -55c tc +125c subgroups types vin = 28vdc 5%, c l = 0 unless otherwise specified min max 1 14.85 15.15 2,3 14.70 15.30 output current 1 i out v in = 16, 28, and 40vdc 1,2,3 all 800 ma v in = 16, 28, and 40vdc, b.w. = 20 hz to 2mhz v in = 16, 28, and 40vdc, line regulation vr line iout = 0%, 50% and 100% all mv rated load 2,3 75 v in = 16, 28, and 40vdc, load regulation vr load i out = 0%, 50% and 100% 1,2,3 all 150 mv rated load i out = 0, inhibit (pin 1) tied to input return (pin 7) i out = 0, inhibit (pin 1) = open i out = 100% rated load b.w. = 20 hz to 2.0mhz 18 0 2,3 77 input to output or any pin isolation iso to case (except pin 6) 1 all 100 m ? at 500vdc, tc = +25c no effect on dc performance, tc = +25c power dissipation overload 5 1a l l 6 . 0 load fault short circuit 1,2,3 all 2.0 01, 04 250 300 switching frequency f s i out = 100% rated load 4,5,6 02, 05 250 270 khz 03, 06 275 300 limits 20 50 35 i in 1,2,3 1,2,3 1 output voltage v out i out = 0 output ripple voltage 2 v rip input current all 18 all capacitive load 3, 4 c l 4 all v all 50 mv p-p ma ma p-p efficiency e ff i out = 100% rated load all % input ripple current 2 i rip 1,2,3 all 200 f p d w downloaded from: http:///
www.irf.com 9 ahf28xx series table iv. electrical performance characteristics - continued ahf2815s notes to specifications 1. parameter guaranteed by line and load regulation tests.2. bandwidth guaranteed by design. tested for 20khz to 2.0mhz. 3. capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn-on. 4. parameter shall be tested as part of design characterization and after design or process changes. thereafter, parameters shall be guaranteed to the limits specified in table iii. 5. an overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. 6. load step transition time between 2.0 s and 10 s. 7. recovery time is measured from the initiation of the transient to where v out has returned to within 1.0 percent of v out at 50 percent load. 8. input step transition time between 2.0 s and 10 s. 9. turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin 2) while power is applied to the input is unlimited. test symbol conditions group a device unit -55c tc +125c subgroups types vin = 28vdc 5%, c l = 0 unless otherwise specified min max 50% to/from 100% rated load 0% to/from 50% rated load 41 0 0 5,6 200 45 . 0 5,6 10 input step 16v to/from 04 40vdc, i out = 100% 4,5,6 05 -1000 +1000 mvpk rated load 4, 8 06 input step 16v to/from 40vdc, i out = 100% 4,5,6 500 s rated load 4, 7, 8 turn on overshoot vton os i out = o and 100% rated load 4,5,6 all 750 mvpk turn on delay ton d i out = o and 100% rated load 9 4,5,6 all 12 ms load fault recovery 4, 9 weight 38 g mvpk 4,5,6 -800 +800 -1000 +750 output response to step transient load changes 6 vo tload ms tr lf 4,5,6 all 12 s ms 4,5,6 0% to/from 50% rated load all tt load output response to transient step line changes recovery time transient step line changes tt line vo tline limits 01 all recovery time step transient load changes 6, 7 50% to/from 100% rated load downloaded from: http:///
10 www.irf.com ahf28xx series specifications ahf2805d table v. electrical performance characteristics for notes to specifications, refer to page 11 input voltage -0.5v to +50v soldering temperature 300c for 10 seconds operating case temperature -55c to +125c storage case temperature -65c to +135c absolute maximum ratings test symbol conditions group a device unit -55c tc +125c subgroups types vin = 28vdc 5%, c l = 0 unless otherwise specified min max 1 4.95 5.05 2,3 4.90 5.10 v in = 16, 28, and 40vdc each output v in = 16, 28, and 40vdc, b.w. = 20 hz to 2mhz v in = 16, 28, and 40vdc, line regulation 4 vr line iout = 0%, 50% and 100% 1,2,3 01 30 mv rated load v in = 16, 28, and 40vdc, load regulation 4 vr load i out = 0%, 50% and 100% 1,2,3 01 30 mv rated load cross regulation 5 vr cross 10% to 90% load changes 1,2,3 01 10 % i out = 0, inhibit (pin 1) tied to input return (pin 7) i out = 0, inhibit (pin 1) = open i out = 100% rated load b.w. = 20 hz to 2.0mhz i out = 100% rated load, 1,3 75 tc = +25c, 27 2 input to output or any pin isolation iso to case (except pin 6) 1 01 100 m ? at 500vdc, tc = +25c no effect on dc performance, tc = +25c, total for both outputs power dissipation overload, tc = +25c 6.0 load fault short circuit, tc = +25c 2.0 switching frequency f s i out = 100% rated load 4,5,6 01 500 600 khz ma capacitive load 6, 7 01 1,2,3 input current i in 1,2,3 p d w f 200 01 4 c l ma p-p efficiency 4 e ff 01 % input ripple current 3, 4 i rip 1,2,3 v 01 60 mv p-p a 0.12 1.08 0101 12 01 50 60 output voltage v out i out = 0 output ripple voltage 3 v rip output current 1, 2 i out 1,2,3 limits 01 1,2,3 downloaded from: http:///
www.irf.com 11 ahf28xx series table v. electrical performance characteristics - continued ahf2805d notes to specifications1. parameter guaranteed by line load and cross regulation tests. 2. up to 90 percent of full power is available from either output provided the total output does not exceed 12w. 3. bandwidth guaranteed by design. tested for 20khz to 2.0mhz. 4. load current split equally between +v out and Cv out . 5. 1.2 watt load on output under test, 1.2w to 10.8w load change on other output.6. capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn-on. 7. parameter shall be tested as part of design characterization and after design or process changes. thereafter, parameters shall be guaranteed to the limits specified in table iv. 8. an overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. 9. load step transition time between 2.0 s and 10 s. 10. recovery time is measured from the initiation of the transient to where v out has returned to within 1.0 percent of v out at 50 percent load. 11. input step transition time between 2.0 s and 10 s. 12. turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin 1) while power is applied to the input. test symbol conditions group a device unit -55c tc +125c subgroups types vin = 28vdc 5%, c l = 0 unless otherwise specified min max 50% to/from 100% rated load 0% to/from 50% rated load input step 16v to/from 40vdc, i out = 100% 4,5,6 01 -400 +400 mvpk rated load input step 16v to/from 40vdc, i out = 100% 4,5,6 1200 s rated load turn on overshoot 4 vton os i out = o and 100% rated load 4,5,6 01 600 mvpk turn on delay ton d i out = o and 100% rated load 9 4,5,6 01 25 ms load fault recovery 4, 9 weight 38 g limits 70 vo tload recovery time transient step line changes 4, 7, 10, 11 tt line vo tline 01 01 recovery time step transient load changes 4, 9,10 50% to/from 100% rated load 0% to/from 50% rated load 01 tt load output response to transient step line changes 4, 7, 11 4,5,6 output response to step transient load changes 4, 9 ms tr lf 4,5,6 01 25 s 4,5,6 4,5,6 -400 +400 -800 +800 mvpk 4,5,6 100 downloaded from: http:///
12 www.irf.com ahf28xx series specifications ahf2812d table vi. electrical performance characteristics for notes to specifications, refer to page 13 input voltage -0.5v to +50v soldering temperature 300c for 10 seconds operating case temperature -55c to +125c storage case temperature -65c to +135c absolute maximum ratings test symbol conditions group a device unit -55c tc +125c subgroups types vin = 28vdc 5%, c l = 0 unless otherwise specified min max 1 11.88 12.12 2,3 11.76 12.24 v in = 16, 28, and 40vdc each output v in = 16, 28, and 40vdc, b.w. = 20 hz to 2mhz v in = 16, 28, and 40vdc, line regulation 4 vr line iout = 0%, 50% and 100% 1,2,3 01 30 mv rated load v in = 16, 28, and 40vdc, load regulation 4 vr load i out = 0%, 50% and 100% 1,2,3 01 30 mv rated load cross regulation 5 vr cross 10% to 90% load changes 1,2,3 01 3.0 % i out = 0, inhibit (pin 1) tied to input return (pin 7) i out = 0, inhibit (pin 1) = open i out = 100% rated load b.w. = 20 hz to 2.0mhz i out = 100% rated load, 1,3 77 tc = +25c 27 4 input to output or any pin isolation iso to case (except pin 6) 1 01 100 m ? at 500vdc, tc = +25c no effect on dc performance, tc = +25c, total for both outputs power dissipation overload, tc = +25c 6.0 load fault short circuit, tc = +25c 2.0 switching frequency f s i out = 100% rated load 4,5,6 01 500 600 khz 1,2,3 limits 01 1,2,3 output voltage v out i out = 0 output ripple voltage 3 v rip output current 1, 2 i out 01 12 01 50 60 v 01 60 mv p-p ma 100 900 01 ma p-p efficiency 4 e ff 01 % input ripple current 3, 4 i rip 1,2,3 200 01 4 c l ma capacitive load 6, 7 01 1,2,3 input current i in 1,2,3 p d w f downloaded from: http:///
www.irf.com 13 ahf28xx series table vi. electrical performance characteristics - continued ahf2812d notes to specifications 1. parameter guaranteed by line load and cross regulation tests. 2. up to 90 percent of full power is available from either output provided the total output does not exceed 12w. 3. bandwidth guaranteed by design. tested for 20khz to 2.0mhz. 4. load current split equally between +v out and Cv out . 5. 1.2 watt load on output under test, 1.2w to 10.8w load change on other output.6. capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive oad in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn-on. 7. parameter shall be tested as part of design characterization and after design or process changes. thereafter, parameters shall be guaranteed to the limits specified in table v. 8. an overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. 9. load step transition time between 2.0 s and 10 s. 10. recovery time is measured from the initiation of the transient to where v out has returned to within 1.0 percent of v out at 50 percent load. 11. input step transition time between 2.0 s and 10 s. 12. turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin 1) while power is applied to the input. test symbol conditions group a device unit -55c tc +125c subgroups types vin = 28vdc 5%, c l = 0 unless otherwise specified min max 50% to/from 100% rated load 0% to/from 50% rated load input step 16v to/from 40vdc, i out = 100% 4,5,6 01 -750 +750 mvpk rated load input step 16v to/from 40vdc, i out = 100% 4,5,6 1200 s rated load turn on overshoot 4 vton os i out = o and 100% rated load 4,5,6 01 600 mvpk turn on delay ton d i out = o and 100% rated load 9 4,5,6 01 25 ms load fault recovery 4, 9 weight 38 g s 4,5,6 4,5,6 -200 +200 -800 +800 mvpk 4,5,6 1000 ms tr lf 4,5,6 01 25 01 01 recovery time step transient load changes 4, 9,10 50% to/from 100% rated load 0% to/from 50% rated load 01 tt load output response to transient step line changes 4, 7, 11 4,5,6 output response to step transient load changes 4, 9 vo tload recovery time transient step line changes 4, 7, 10, 11 tt line vo tline limits 70 downloaded from: http:///
14 www.irf.com ahf28xx series specifications ahf2815d table vii. electrical performance characteristics for notes to specifications, refer to page 15 input voltage -0.5v to +50v soldering temperature 300c for 10 seconds operating case temperature -55c to +125c storage case temperature -65c to +135c absolute maximum ratings test symbol conditions group a device unit -55c tc +125c subgroups types vin = 28vdc 5%, c l = 0 unless otherwise specified min max 1 14.85 15.15 2,3 14.70 15.30 v in = 16, 28, and 40vdc each output v in = 16, 28, and 40vdc, b.w. = 20 hz to 2mhz v in = 16, 28, and 40vdc, line regulation 4 vr line iout = 0%, 50% and 100% 1,2,3 01 35 mv rated load v in = 16, 28, and 40vdc, load regulation 4 vr load i out = 0%, 50% and 100% 1,2,3 01 35 mv rated load cross regulation 5 vr cross 10% to 90% load changes 1,2,3 01 3.0 % i out = 0, inhibit (pin 1) tied to input return (pin 7) i out = 0, inhibit (pin 1) = open i out = 100% rated load b.w. = 20 hz to 2.0mhz i out = 100% rated load, 1,3 78 tc = +25c 27 5 input to output or any pin isolation iso to case (except pin 6) 1 01 100 m ? at 500vdc, tc = +25c no effect on dc performance, tc = +25c, total for both outputs power dissipation overload, tc = +25c 6.0 load fault short circuit, tc = +25c 2.5 switching frequency 4 f s i out = 100% rated load 4,5,6 01 500 600 khz 1,2,3 limits 01 1,2,3 output voltage v out i out = 0 output ripple voltage 3 v rip output current 1, 2 i out 01 12 01 50 55 v 01 60 mv p-p ma 80 720 01 ma p-p efficiency 4 e ff 01 % input ripple current 3, 4 i rip 1,2,3 200 01 4 c l ma capacitive load 6, 7 01 1,2,3 input current i in 1,2,3 p d w f downloaded from: http:///
www.irf.com 15 ahf28xx series 1. parameter guaranteed by line load and cross regulation tests. 2. up to 90 percent of full power is available from either output provided the total output does not exceed 12w. 3. bandwidth guaranteed by design. tested for 20khz to 2.0mhz. 4. load current split equally between +v out and Cv out . 5. 1.2 watt load on output under test, 1.2w to 10.8w load change on other output. 6. capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn-on. 7. parameter shall be tested as part of design characterization and after design or process changes. thereafter, parameters shall be guaranteed to the limits specified in table vi. 8. an overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. 9. load step transition time between 2.0 s and 10 s. 10. recovery time is measured from the initiation of the transient to where v out has returned to within 1.0 percent of v out at 50 percent load. 11. input step transition time between 2.0 s and 10 s. 12. turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin 1) while power is applied to the input. table vii. electrical performance characteristics - continued ahf2815d notes to specifications test symbol conditions group a device unit -55c tc +125c subgroups types vin = 28vdc 5%, c l = 0 unless otherwise specified min max 50% to/from 100% rated load 0% to/from 50% rated load input step 16v to/from 40vdc, i out = 100% 4,5,6 01 -750 +750 mvpk rated load input step 16v to/from 40vdc, i out = 100% 4,5,6 1200 s rated load turn on overshoot 4 vton os i out = o and 100% rated load 4,5,6 01 750 mvpk turn on delay ton d i out = o and 100% rated load 9 4,5,6 01 25 ms load fault recovery 4, 9 weight 38 g limits 70 vo tload recovery time transient step line changes 4, 7, 10, 11 tt line vo tline 01 01 recovery time step transient load changes 4, 9,10 50% to/from 100% rated load 0% to/from 50% rated load 01 tt load output response to transient step line changes 4, 7, 11 4,5,6 output response to step transient load changes 4, 9 ms tr lf 4,5,6 01 25 s 4,5,6 4,5,6 -200 +200 -800 +800 mvpk 4,5,6 500 downloaded from: http:///
16 www.irf.com ahf28xx series application information connecting the enable input (pin 1) to input common (pin 7)will cause the converter to shut down. it is recommended that the enable pin be driven by an open collector device capable of sinking at least 400a of current. the open circuit voltage of the enable input is 15 1.0vdc. if the inhibit function is not used, this input can be left unconnected because it is internally pulled-up. thermal management assuming that there is no forced air flow, the packagetemperature rise above ambient ( ? t) may be calculated using the following expression: where a = the effective surface area in square inches(including heat sink if used), p = power dissipation in watts. the total surface area of the ahf package is 4.9 squareinches. if a worse case full load efficiency of 78% is assumed, then the case temperature rise can be calculated as follows: hence, if t ambient = +25 c, the dc/dc converter case temperature will be approximately 100 c if no heat sink or air flow is provided. inhibit function (enable) ? t 80 a C0.7 p 0.85 ( c) w eff p p out 4.3 1 78.0 1 12 1 1 = ? ? ? ? ? ? ? = ? ? ? ? ? ? ? = ? t = 80 (4.9) -0.7 (3.4) 0.85 = 74 c to calculate the heat sink area required to maintain aspecific case temperature rise, the above equation may be manipulated as follows: pkg ? ? ? ? ? ? ? ? ? 43.1 85.0 80 a heat sink = as an example, if a maximum case temperature rise of50c rise above ambient is desired, then the required effective heat sink area is: 2 43.1 85.0 . 75.3 9.4 )4.3(80 50 in heatsink = ? ? ? ? ? ? ? = ? standard microcircuit drawing equivalence table standard microcircuit vendor cage ir standard drawing number code part number 5962-91600 52467 ahf2805s 5962-94568 52467 ahf2812s 5962-94563 52467 ahf2815s 5962-05205 52467 ahf2805d 5962-92111 52467 ahf2812d 5962-92351 52467 ahf2815d downloaded from: http:///
www.irf.com 17 ahf28xx series ( single output ) block diagram ( dual output ) block diagram 2 3 +vout output return pulse width modulator primary housekeeping supply emi filter under-voltage detector 8 7 +input enable input input return error amp & ref fb cs drive 4 -vout 6 case 1 4 3 +vout output return pulse width modulator primary housekeeping supply emi filter under-voltage detector 8 1 7 +input enable input input return error amp & ref fb cs drive 6 case downloaded from: http:///
18 www.irf.com ahf28xx series pin designation mechanical outlines 1.450 (36.83) 0.260 (6.600) 0.030 dia., 8 pins (0.760) 0.800 (20.32) 4 7 5 8 6 12 3 1.120 (28.45) 0.090 r typ (2.290) 0.330 (8.380) max 1.105 (28.07) 0.905 (22.99) 0.705 (17.91) 0.505 (12.83) 0.205 (5.21) non-flanged flanged pin # single output dual output 1 enable input enable input 2 nc + output 3 output return output return 4 + output - output 5n c n c 6 case case 7 input return input return 8 +input +input downloaded from: http:///
www.irf.com 19 ahf28xx series part numbering world headquarters: 233 kansas st., el segundo, california 90245, tel: (310) 252-7105 ir san jose: 2520junction avenue, san jose, california 95134, tel: (408) 434-5000 visit us at www.irf.com for sales contact information . data and specifications subject to change without notice. 03/2010 notes: best commercial practice sample tests at low and high temperatures -55c to +105c for ahe, ato, atw device screening requirement mil-std-883 method no suffix es hb ch temperature range -20c to +85c -55c to +125c -55c to +125c -55c to +125c element evaluation mil-prf-38534 n/a n/a n/a class h non-destructive bond pull internal visual 2017 yes yes yes temperature cycle 1010 n/a cond b cond c cond c constant acceleration 2001, y1 axis n/a 500 gs 3000 gs 3000 gs pind 2020 n/a n/a n/a n/a burn-in 1015 n/a 48 hrs@hi temp 160 hrs@125c 160 hrs@125c final electrical mil-prf-38534 25c 25c -55c, +25c, -55c, +25c, ( group a ) & specification +125c +125c pda mil-prf-38534 n/a n/a n/a 10% seal, fine and gross 1014 cond a cond a, c cond a, c cond a, c radiographic 2012 n/a n/a n/a n/a external visual 2009 yes yes yes n/a n/a 2023 n/a n/a ahf 28 05 s f /ch model input voltage nominal 28 = 28v output voltage single C 03r3 = 3.3v 05 = 5v 12 =12v 15 =15v dual C 05 = 5v 12 = 12v 15 = 15v output s = single d = dual package style f = flange blank = non-flanged screening level (please refer to screening table) no suffix, es, hb, ch downloaded from: http:///

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