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ampss ? astec modular power supply system series highlights ? high efficiency - up to 88% ? 100c baseplate/ case operating temperature - no derating ? fixed switching frequency ? low output ripple and noise ? high reliability - over 1 million hours mtbf ? designed to meet all telecom specifications am80a performance series dc-dc converter module technical reference manual
am80a performance series rev. 06 mar 03 ampss ? reference manual 2 contents introduction ............................................................................................................ 4 special features ...................................................................................................... 4 ordering information ............................................................................................... 5 safety ..................................................................................................................... 5 electrical specifications ............................................................... 6 absolute maximum ratings ? all models ................................................................. 6 pin connections - all models ................................................................................... 7 insulation - all models .............................................................................................. 8 electrical specifications for 48v input models (am80a-048l-xxxfyy) .................... 9 electrical specifications for 150v input models (am80a-150l-xxxfyy) .................. 11 electrical specifications for 300v input models (am80a-300l-xxxfyy) ................. 12 electrical specifications for 320v input models (am80a-320l-xxxfyy) ................. 14 functional description ............................................................... 15 remote sense (+sense, -sense) ....................................................................... 15 enable control (enable) .................................................................................... 15 output voltage adjustment (v adj) ...................................................................... 16 current limit adjustment (c lim adj) ................................................................. 16 overvoltage protection adjustment (ovp adj) ..................................................... 16 power good/identification (pg/id) ....................................................................... 17 clock signals (clk in, clk out) ...................................................................... 17 current sharing (c share) .................................................................................. 18 current monitoring (c mon) ................................................................................ 18 temperature monitoring (temp mon) ................................................................. 18 design considerations ................................................................ 19 input bulk capacitors ........................................................................................... 19 remote loads ...................................................................................................... 19 thermal data ........................................................................................................ 19 overtemperature protection ................................................................................... 19 parallel connection considerations ........................................................................ 20
rev. 06 mar 03 ampss ? reference manual specifications 3 o utput ripple and noise ....................................................................................... 20 conducted emi .................................................................................................... 20 break regulation ................................................................................................... 20 input undervoltage protection ............................................................................... 21 application examples ................................................................. 22 ac input design ................................................................................................... 22 parallel connection design .................................................................................... 22 mechanical information ............................................................. 23 dimensions ........................................................................................................... 23 recommended pcb layout .................................................................................. 24 heatsink mounting information .............................................................................. 25
am80a performance series rev. 06 mar 03 ampss ? reference manual 4 am80a performance series dc-dc converters introduction the single output am80a is an isolated, single output dc to dc converter module, providing up to 252w output with a maximum baseplate operating temperature of 100c with no derating. the am80a features full safety isolated low voltage secondary side control and astec linear programming (alp?) for convenient adjustment of the module's parameters. the dual output am80a provides two outputs, 3.3v and 5.0v. special features ? high efficiency - up to 88% ? 1mhz fixed switching frequency ? 100c baseplate/ case operating temperature - no derating ? low output ripple and noise ? excellent transient response ? safety isolated low voltage interface with alp tm linear control ? high reliability - over 1 million hours mtbf ? wide input voltage range ? parallelable with accurate current sharing ? current and temperature monitoring outputs
rev. 06 mar 03 ampss ? reference manual specifications 5 ordering information please contact astec for information on other output voltages, power ranges and configurations. safety ul: ul1950 csa: csa c22.2 no.950 vde: vde 0805 en60950 ce: ce mark please contact astec for information on specific module approvals. note: ensure all modules are used according to the installation instructions provided with each module. model number input voltage output voltage output current output power am80a-320l-280f09 320v 28v 9a 252w am80a-300l-022f60 300v 2.2v 60a 132w am80a-300l-033f50 300v 3.3v 50a 165w am80a-300l-050f40 300v 5v 40a 200w am80a-300l-120f18 300v 12v 18a 216w am80a-300l-150f16 300v 15v 16a 240w am80a-300l-065f33 300v 6.5v 33a 214.5w am80a-300l-240f10 300v 24v 10a 240w am80a-300l-280f09 300v 28v 9a 252w am80a-150l-065f33 150v 6.5v 33a 214.5w am80a-048l-012f60 48v 1.2v 60a 72w am80a-048l-022f60 48v 2.2v 60a 132w am80a-048l-033f50 48v 3.3v 50a 165w am80a-048l-050f40 48v 5v 40a 200w am80a-048l-120f18 48v 12v 18a 216w am80a-048l-150f16 48v 15v 16a 240w am80a-048l-240f10 48v 24v 10a 240w all modules are designed to meet the following specifications: ets300-132-2 ets300-386-1 (1) en55022-a (1) en55022-b (1) en41003 iec6100-44 (1) iec6100-45 (1) iec950 vde0871-a (1) vde0878-a (1) btnr2511(5) (1) (1) require additional circuitry for full compliance. please refer to application section of this manual or contact technical support office for further information.
am80a performance series rev. 06 mar 03 ampss ? reference manual 6 electrical specifications absolute maximum ratings ? all models exceeding the specified absolute maximum ratings may severely damage the module. these ratings are intended as guidelines for absolute worst case operating conditions and are not to be interpreted as recommended operating condition notes: * for 300/320v input : all isolation barriers on 300v input modules have been designed and tested to meet 4242vdc as required by iec950 for reinforced insulation. the complete module should not be subjected to a 3000vac input-to-output test because this can result in input- baseplate-output breakdown. ampss dc-dc modules are class i equipment. power supply systems using ampss modules must also be class i equipment. each ampss dc-dc module is fully tested in factory according to the standards. therefore power supply systems need only be subjected to hi-pot test for basic insulation which is 1500vac (ac) input to ground. secondary control pins +sense v o - 0.5 to v o + 0.5 vdc -sense -0.5 to 0.5 vdc temp mon -0.5 to 7 vdc c mon -0.5 to 7 vdc c share -0.5 to 7 vdc clk out -50 to 50 vdc clk in -50 to 50 vdc c lim adj -0.5 to 7 vdc ovp adj -0.5 to 7 vdc v adj -0.5 to 7 vdc pg/id 0.5 to v o + 0.5vdc enable -0.5 to 20 vdc note : v o = module output voltage all voltage referenced to negative output specifications electrical characteristics are guaranteed over the full baseplate/ case temperature range (-20 to 100c) and for the full range of input voltage (v i ) and for the full load range (0 to i o rated). except where indicated , +sense and -sense are connected to the output terminals at the point of measurement, enable is connected to -sense. all other pins are left floating. definitions v i , v o and i o are actual operating conditions, v inom , v onom and i orated are nominal ratings. general 320v input 300v input 150v input 48v input continuous input voltage 400v 400v 200v 72v input surge voltage (1 sec) 425v 425v 225v 75v (continuous) isolation, input to output* 2700vdc 2700vdc 2700vdc 2100vdc isolation input to baseplate* 2121vdc 2121vdc 2121vdc 2100vdc isolation, output to baseplate* 500vdc 500vdc 500vdc 500vdc operating temperature (baseplate) /case -20 to 100c * storage temperature -40 to 105c operating relative humidity (non-condensing) 10% to 95% storage relative humidity (non-condensing) 95% max altitude (operating) < 3000m altitude (storage) < 9000m lead temperature (soldering 5 seconds) 235c
rev. 06 mar 03 ampss ? reference manual specifications 7 pin connections - all models control pins pin no pin name type description recommended connections 1 +sense input used for remote sense function to compensate for load bus resistance if remote sensing is not required connect to +output pins 21-24 of the module 2 temp mon output provides a voltage signal proportional to the internal absolute temperature of the module analog signal output. leave unconnected if not used 3 c mon output provides a current signal proportional to the current being supplied by the module analog signal output. leave unconnected if not used 4 c share input/output allows modules connected in parallel to accurately share current connect to c share pins of other modules. leave unconnected if not used 5 clk out output provides a 1mhz clock output for synchronization with other modules capacitor coupled output. leave unconnected if not used 6 clk in input accepts a 1mhz clock input for synchronization with other modules capacitor coupled input. leave unconnected if not used 7 pg/id output high level output (v pg/id = v o ) indicates module converter is running. can also be used to identify the nominal output voltage of the module by measuring resistance between pg/id and +output id resistance = [v o(nom) ]kw leave unconnected if not use 8 c lim adj input used to adjust the current limit set point internal 1ma current source. leave unconnected if not used 9 ovp adj input used to adjust module output overvoltage threshold internal 1ma current source. leave unconnected if not used 10 v adj input used to adjust module output voltage internal 1ma current source. leave unconnected if not used 11 enable input enables or disables the output of the module must be connected to -sense pin or driven to <0.7v to enable the output of the module 12 -sense input/ reference used for remote sense function to compensate for load bus resistance if remote sensing is not required connect to -output pins 26-29 of the module input pins pin no pin name type description recommended connections 31 +input input power input - positive a 220f electrolytic capacitor connected between the +input and -input pins is recommended 32 -input input power input - negative (return) see + input for recommendations output pins pin no pin name type description recommended connections 21-24 +output output power output - positive ensure good electrical connection and sufficient copper on pcb layouts 26-29 -output output power output - negative see +output for recommendations
am80a performance series rev. 06 mar 03 ampss ? reference manual 8 control signals control function conditions parameter min typ max units temp mon - temperature v t mon sensitivity 9.8 10 10.2 mv/c monitor signal source impedence 1 kw c mon - current monitor i o = i orated i c mon 0.9 1 1.1 ma signal measured range 20 100 %i orated c share - current share c share pins of modules in c share accuracy 3% 10 %i o rated function parallel connected max no. of units 10 clk out - clock output v clk out 3.3 5.5 vp-p clk in open clock freq. 0.98 1 1.02 mhz max fan out 2 clk in - clock input v clk in 3.3 5.5 vp-p clock freq 0.9 1 1.1 mhz pg/id power good converter running : v pg/id 100 %v o / identification function i o 3 5%i orated for i orated 3 20a i o > 1a for i orated <20a converter not running 320v, 300v & 150v input v pg/id 0.2 v converter not running 48v input v pg/id 1.0 v 5v output 5.00 5.1 6.12 k w 6.5v output resistance; pg/id to 6.66 6.8 7.82 k w 12v output positive output terminal 11.76 12 13.02 k w 15v output 14.70 15 16.02 k w 24v output 23.52 24 25.02 k w 28v output 26.46 27 28.02 k w c lim adj - current limit v c lim adj = 0.8v c lim set point 20 %i omax adjustment v c lim adj = 4.0v c lim set point 100 %i omax v c lim adj = 1v c lim current source 0.95 1 1.05 ma ovp adj 1 - output v ovp adj = 0v ovp set point 150 %v onom overvoltage protection v ovp adj >= 1v ovp set point 110 %v onom adjustment v ovp adj = 1v ovp adj current source 0.95 1 1.05 ma v adj - voltage adjust v vadj = 0v v o 78 80 82 %v onom v vadj = 2v v o 118 120 122 %v onom v vadj = 1v v adj current source 0.95 1 1.05 ma enable - module enable module enabled v enable 0 0.7 v module disabled v enable 2 10 v v enable = 0.7v enable current source 100 150 a notes : 1. ovp trip point must be adjusted to accomodate maximum remote sense compensation all models
rev. 06 mar 03 ampss ? reference manual specifications 9 electrical specifications for 48v input models (am80a-048l-xxxfyy) transient characteristics parameter conditions min typ max units turn-on time v i = 0 to v inom 1 10 msec transient response step-load excursion (25% to 75% load change @ am80a-048l-012f60 36 60 mv 0.1a/s, recovery to 1% v o ) am80a-048l-022f60 66 110 mv am80a-048l-033f50 100 165 mv am80a-048l-050f40 150 250 mv am80a-048l-120f18 360 600 mv am80a-048l-150f16 450 750 mv am80a-048l-240f10 720 1200 mv step-load response am80a-048l-012f60 400 s am80a-048l-022f60 400 s am80a-048l-033f50 400 s am80a-048l-050f40 400 s am80a-048l-120f18 300 s am80a-048l-150f16 250 s am80a-048l-240f10 300 s input characteristics parameter conditions min typ max units input voltage 36 48 72 v input surge voltage (continuous) 75 v input low line power on voltage module power on 30 35 v input low line power off voltage module shutdown 24 31.5 v no load input power v i = v inom 5 w input capacitance 5 f input current low line, nom v o , max i o am80a-048l-012f60 3.3 a am80a-048l-022f60 5.3 a am80a-048l-033f50 6.2 a am80a-048l-050f40 7.0 a am80a-048l-120f18 7.5 a am80a-048l-150f16 8.3 a am80a-048l-240f10 8.2 a
am80a performance series rev. 06 mar 03 ampss ? reference manual 10 electrical specifications for 48v input models (cont'd) output characteristics parameter conditions min typ max units nominal (factory set) output voltage am80a-048l-012f60 1.2 v am80a-048l-022f60 2.2 v am80a-048l-033f50 3.3 v am80a-048l-050f40 5.0 v am80a-048l-120f18 12.0 v am80a-048l-150f16 15.0 v am80a-048l-240f10 24.0 v output voltage set point accuracy t c = +25c, v i = v inom , i o = i orated -1 1 %v onom remote sense compensation v i = v imin 0.5 v output voltage adjust 80 120 %v onom nominal (factory set) output overvoltage protection trip point 110 115 120 %v o overvoltage protection trim range 110 150 %v o line regulation v imin to v imax ; all models 0.2 %v onom except : am80a-048l-012f60 10 mv am80a-048l-022f60 10 mv am80a-048l-033f50 10 mv load regulation i omin to i omax ; all models 0.2 %v onom except : am80a-048l-012f60 10 mv am80a-048l-022f60 10 mv am80a-048l-033f50 10 mv noise and ripple 20mhz bandwidth am80a-048l-012f60 50 100 mv am80a-048l-022f60 50 100 mv am80a-048l-033f50 50 100 mv am80a-048l-050f40 50 100 mv am80a-048l-120f18 120 240 mv am80a-048l-150f16 240 300 mv am80a-048l-240f10 240 480 mv output current am80a-048l-012f60 0 60 a am80a-048l-022f60 0 60 a am80a-048l-033f50 0 50 a am80a-048l-050f40 0 40 a am80a-048l-120f18 0 18 a am80a-048l-150f16 0 16 a am80a-048l-240f10 0 10 a output current limit v o dropped to 90% of v onom 105 110 115 %i omax short circuit current am80a-048l-012f60 160 %i omax am80a-048l-022f60 160 %i omax am80a-048l-033f50 160 %i omax am80a-048l-050f40 160 %i omax am80a-048l-120f18 200 %i omax am80a-048l-150f16 200 %i omax am80a-048l-240f10 200 %i omax temperature coefficient per c baseplate temperature 0.02 %v o /c overtemperature shutdown all models 105 110 120 c efficiency v o = v onom , v i = v inom, i o = i orated am80a-048l-012f60 60 64 % am80a-048l-022f60 70 72 % am80a-048l-033f50 75 80 % am80a-048l-050f40 83 84 % am80a-048l-120f18 85 87 % am80a-048l-150f16 84 87 % am80a-048l-240f10 85 88 %
rev. 06 mar 03 ampss ? reference manual specifications 11 electrical specifications for 150v input models (am80a-150l-xxxfyy) output characteristics parameter conditions min typ max units nominal (factory set) output voltage am80a-150l-065f33 6.5 v output voltage set point accuracy t c = +25c, v i = v inom , i o = i orated -1 1 %v onom remote sense compensation 1 v i = v imin 0.5 v output voltage adjust 80 120 %v onom nominal (factory set) output overvoltage protection trip point 110 115 120 %v o overvoltage protection trim range 110 150 %v onom line regulation v imin to v imax 0.2 %v onom load regulation 0 to i omax 0.2 %v onom noise and ripple 20mhz bandwidth am80a-150l-065f33 65 130 mv output current am80a-150l-065f33 0 33 a output current limit v o dropped to 90% of v onom 105 110 115 %i omax short circuit current am80a-150l-065f33 160 %i omax temperature coefficient per c baseplate temperature 0.02 %v o /c overtemperature shutdown baseplate temperature 105 110 120 c efficiency v o = v onom , v i = v inom , i o = i orated am80a-150l-065f33 80 83 % input characteristics parameter conditions min typ max units input voltage 90 150 200 v input surge voltage (1 second) 220 v input low line power on voltage module power on 75 88 v input low line power off voltage module shutdown 60 79 v no load input power v i = v inom 5 w input capacitance 1.2 f input current low line, nom v o , max i o am80a-150l-065f33 3 a input current nom line, max v o , max i o am80a-150l-065f33 2.1 a transient characteristics parameter conditions min typ max units turn-on time v i = 0 to v inom 1 10 msec transient response step-load excursion (25% to 75% load change @ am80a-150l-065f33 195 325 mv 0.1a/s, recovery to 1% vo) step-load response 250 s
am80a performance series rev. 06 mar 03 ampss ? reference manual 12 electrical specifications for 300v input models (am80a-300l-xxxfyy) transient characteristics parameter conditions min typ max units turn-on time v i = 0 to v inom 1 10 msec transient response - step-load excursion (25% to 75% load change @ am80a-300l-022f60 66 110 mv 0.1a/s, recovery to 1% vo) am80a-300l-033f50 100 165 mv am80a-300l-050f40 150 250 mv am80a-300l-065f33 195 325 mv am80a-300l-120f18 360 600 mv am80a-300l-150f16 450 750 mv am80a-300l-240f10 720 1200 mv am80a-300l-280f09 700 1400 mv step load response 250 sec input characteristics parameter conditions min typ max units input voltage all models - 180 300 400 v except : am80a-300l-065f33 240 300 400 v am80a-300l-280f09 200 300 400 v input surge voltage (1 second) 425 v input low line power on voltage module power on 150 175 v input low line power off voltage module shutdown 120 157.5 v no load input power v i = v inom 5 w input capacitance 0.5 f input current low line, nom v o , max i o am80a-300l-022f60 1.1 a am80a-300l-033f50 1.3 a am80a-300l-050f40 1.4 a am80a-300l-065f33 1.5 a am80a-300l-120f18 1.5 a am80a-300l-150f16 1.6 a am80a-300l-240f10 1.6 a am80a-300l-280f09 1.6 a
rev. 06 mar 03 ampss ? reference manual specifications 13 electrical specifications for 300v input models (cont'd) output characteristics parameter conditions min typ max units nominal (factory set) output voltage am80a-300l-022f60 2.2 v am80a-300l-033f50 3.3 v am80a-300l-050f40 5.0 v am80a-300l-065f33 6.5 v am80a-300l-120f18 12.0 v am80a-300l-150f16 15.0 v am80a-300l-240f10 24.0 v am80a-300l-280f09 28.0 v output voltage set point accuracy t c = +25c, v i = v inom , i o = i orated -1 1 %v onom remote sense compensation v i = v imin 0.5 v output voltage adjust 80 120 %v onom nominal (factory set) output overvoltage protection trip point 110 115 120 %v o overvoltage protection trim range 110 150 %v o line regulation v imin to v imax ; all models 0.2 %v onom except : am80a-300l-022f60 10 mv am80a-300l-033f50 10 mv load regulation i omin to i omax ; all models 0.2 %v onom except : am80a-300l-022f60 10 mv am80a-300l-033f50 10 mv noise and ripple 20mhz bandwidth am80a-300l-022f60 50 100 mv am80a-300l-033f50 50 100 mv am80a-300l-050f40 50 100 mv am80a-300l-065f33 65 130 mv am80a-300l-120f18 120 240 mv am80a-300l-150f16 240 300 mv am80a-300l-240f10 240 480 mv am80a-300l-280f09 280 560 mv output current am80a-300l-022f60 0 60 a am80a-300l-033f50 0 50 a am80a-300l-050f40 0 40 a am80a-300l-065f33 0 33 a am80a-300l-120f18 0 18 a am80a-300l-150f16 0 16 a am80a-300l-240f10 0 10 a am80a-300l-280f09 0 9 a output current limit v o dropped to 90% of v onom 105 110 115 %i omax short circuit current am80a-300l-022f60 160 %i omax am80a-300l-033f50 160 %i omax am80a-300l-050f40 160 %i omax am80a-300l-065f33 165 %i omax am80a-300l-120f18 200 %i omax am80a-300l-150f16 200 %i omax am80a-300l-240f10 200 %i omax am80a-300l-280f09 200 %i omax temperature coefficient per c baseplate temperature 0.02 %v o /c overtemperature shutdown baseplate temperature 105 110 120 c efficiency v o = v onom , v i = v inom , i o = i orated am80a-300l-022f60 70 74 % am80a-300l-033f50 75 78 % am80a-300l-050f40 82 83 % am80a-300l-065f33 83 85 % am80a-300l-120f18 84 86 % am80a-300l-150f16 82 86 % am80a-300l-240f10 84 87 % am80a-300l-280f09 85 87 %
am80a performance series rev. 06 mar 03 ampss ? reference manual 14 electrical specifications for 320v input models (am80a-320l-xxxfyy) output characteristics parameter conditions min typ max units nominal (factory set) output voltage am80a-320l-280f09 28 v output voltage set point accuracy t c = +25c, v i = v inom , i o = i orated -1 1 %v onom remote sense compensation v i = v imin 0.5 v output voltage adjust 80 120 %v onom nominal (factory set) output overvoltage protection trip point 110 115 120 %v o overvoltage protection trim range 110 150 %v onom line regulation v imin to v imax 56 mv load regulation 0 to i omax 56 mv noise and ripple 20mhz bandwidth am80a-320l-280f09 375 mv output current am80a-320l-280f09 0 9 a output current limit v o dropped to 90% of v onom 105 110 115 %i omax short circuit current am80a-320l-280f09 200 %i omax temperature coefficient per c baseplate temperature 0.02 %v o /c overtemperature shutdown baseplate temperature 102 105 108 c efficiency v o = v onom , v i = v inom , i o = i orated am80a-320l-280f09 86 88 % input characteristics parameter conditions min typ max units input voltage 256 320 400 v input surge voltage (1 second) 425 v input low line power on voltage module power on 200 230 v input low line power off voltage module shutdown 160 205 v no load input power v i = v inom 5 w input capacitance 0.5 f input current low line, nom v o , max i o am80a-320l-280f09 1.2 a transient characteristics parameter conditions min typ max units turn-on time v i = 0 to v inom 1 10 msec transient response step-load excursion (25% to 75% load change @ am80a-320l-280f09 700 1400 mv 0.1a/s, recovery to 1% vo) step-load response 800 s
rev. 06 mar 03 ampss ? reference manual specifications 15 functional description this section explains how to implement the functions found on the am80a performance series. remote sense (+sense, -sense) connect the +sense and -sense pins of the am80a directly to the load to allow the module to compensate for the voltage drop across the conductors carrying the load current. if remote sensing is not required (for example if the load is close to the module) the sense pins should be connected directly to the module?s output pins to ensure accurate regulation. note: if the sense leads fail open circuit, the module will revert to local sense at the output pins. incorrect connection of sense leads may damage the module enable control (enable) the enable pin is a ttl compatible input used to turn the output of the module on or off. the module output is enabled when the enable pin is connected to - sense or driven to a logic low of <0.7v (but not negative). the output is disabled when the enable pin is open or driven to a logic high >2v. all monitoring and house- keeping functions (including clock signals) continue to operate normally.
am80a performance series rev. 06 mar 03 ampss ? reference manual 16 output voltage adjustment (v adj) the output voltage of the module may be accurately adjusted by up to 20% of the nominal factory set output. adjustment is carried out using either an external voltage source (0 to 2v, capable of sinking 1ma) or a resistor (0 to 2k) connected between v?adj and -sense. current limit adjustment (c lim adj) a constant current limiting circuit protects the module under overload or short circuit conditions. with the c lim adj pin left unconnected the current limit is factory set to 115% of the module's rated output, but may be adjusted across the range from 20% to 100% using an external voltage source (0.8 to 4v, capable of sinking 1ma) or a resistor (800r to 4k) connected between c lim adj and -sense. overvoltage protection adjustment (ovp adj) an independent overvoltage circuit monitors the module's output pins and will shut the module down in the event of an internal or external fault which causes the output voltage to rise above the preset limit. the module is reset by removing and re-applying the input power or toggle the enable off/on.
rev. 06 mar 03 ampss ? reference manual specifications 17 clock signals (clk in, clk out) the module's internal clock is accurate and stable over its full operating range and synchronization is not normally required, but it can reduce noise in paralleled systems. clock signals can be wired in series (the clk out pin of one module to the clk in pin of the next etc) in which case all the modules will be synchronized with the first module in the chain. alternatively, an external clock signal of 5vpk-pk at 1mhz10% can be connected to the clk in pins of all the modules. if the clock input to any module fails, the module will automatically switch back to its internal clock and will continue to operate normally. the clk in and clk out signals are ac coupled, so any module can clock another module regardless of polarity. the resistance between the pg/id pin and the +ve output of the module can be used to determine the output voltage of the module with no power applied according to the table: output voltage (v) resistance (k w w ) 1.2 1.2 2.2 2.2 6.5 6.8 3.3 3.3 5 5.1 12 12 15 15 24 24 28 27 power good/identification (pg/id) this pin provides an indication that the module's converters are working, and can also be used to identify the factory set output voltage of the module. the pg/id pin goes high to the level of the output voltage (v o ) to indicate that the module is operating and delivering power. the output goes low if the converters stop operating due to a fault such as an overtemperature or overvoltage condition. the pg/id pin will also go low if the module is disabled via the enable pin or under light load condition (seespecification). t he overvoltage set point may be adjusted between 10% and 50% above the output voltage (v o ), and automatically tracks adjustments made to the output voltage using v adj. ovp adj should be used to increase the ovp margin if the voltage drop between power output pins and remote sense is more than 0.2v
am80a performance series rev. 06 mar 03 ampss ? reference manual 18 current sharing (c share) to ensure that all modules in a parallel system accurately share current, the c share pins on each module should be connected together. the voltage on the c share pins represents the average load current per module. each module compares this average with its own current and adjusts its output voltage to correct the error. in this way the module maintains accurate current sharing. note: the -sense and +sense pins of each module must also be connected together to ensure accurate current sharing. current monitoring (c mon) the c mon pin provides an indication of the amount of current supplied by the module. the output of the c mon pin is a current source proportional to the temperature monitoring (temp mon) the temp mon pin provides an indication of the module's internal temperature.the voltage at the temp mon pin is proportional to the temperature of the module baseplate at 10mv per c, where: module temperature (c) = (v temp mon x 100) - 273 the temperature monitor signal can be used by thermal management systems (e.g. to control a variable speed fan). it can also be used for overtemperature warning circuits and for thermal design verification of prototype power supplies and heatsinks. output current of the module, where 0.2 to 1ma = 20 to 100% i o rated . the c mon output can be paralleled with c mon outputs from other modules to indicate the total current supplied in a paralleled system.
rev. 06 mar 03 ampss ? reference manual specifications 19 design considerations input bulk capacitors electrolytic bulk reservoir capacitors placed close to the module input pins are recommended to ensure the module is fed with a low source impedance. for the am80a performance series module typical values are 220f/100v for 48v modules and 220f/450v for 300/320v modules. input fusing ampss modules do not have an in-line fuse fitted internally. in order to comply with csa, vde and ul safety regulations it is recommended that a fuse of the following rating be fitted at the module's input. remote loads if the sensed load is some distance from the module, the module's output voltage may rise sufficiently to trigger the ovp protection circuit during a step load change due to bus inductance. for this reason the ovp margin should be increased in extreme cases. fitting a decoupling capacitor at the load can reduce this effect. it should be noted that a distributed power solution, using ampss tm modules placed close to their loads, will optimize transient response. thermal data natural convection thermal impedance of the am80a package without a heatsink is approximately 4c/w. the below characteristic is for a standard horizontal fin heatsink available from astec (part number apa501-80- 002) with 11mm fins and 8mm pitch. the heatsink will reduce module thermal impedance to 1c /w with a forced air flow of 250 lfm when mounted with a thermal pad (astec p/n apa502-80-001) between heatsink and module. overtemperature protection if the module's baseplate temperature exceeds 110c, the module will latch off. to reset the module the input supply or the enable pin of the module must be cycled off and then on again, allowing a period of time for the module to cool down. overtemperature shutdown can also be programmed to occur at lower temperatures by using the temp mon output to control the enable pin. 0 0.2 0.4 0.6 0.8 1 1.2 0 200 400 600 800 1000 vair (lfm) thermal resistance baseplate to ambient (c/w) forced convection for apa501-80-002 at 200w output input fuse rating 300v/320v 10a / 250v 150v 10a / 250v 48v 10a / 250v
am80a performance series rev. 06 mar 03 ampss ? reference manual 20 parallel connection considerations a master-slave configuration is not required for ampss tm modules. am80a modules may be connected in parallel using a simple, single wire connection. current sharing in multi-module paralleled systems, all modules will share current to within ?3% (typical) of the rated load current per module when the c share pins of each module are connected together. the +sense and -sense pins of each module should be connected to common points as close as possible to the load. synchronization modules are synchronized by connecting the clk out pin of one module to the clk in pin of the next. consecu- tively connected modules operate out of phase with each other, resulting in ripple cancellation at the inputs and outputs of paralleled modules. if the clock input to a module fails, it will automatically revert to its internal clock and continue to operate normally. conducted emi although ampss modules contain both common mode and differential mode input emi filtering, power supply systems using these modules will require additional emi filtering to enable the system to meet relevant emi standards. am80a modules have an effective input to ground (baseplate) capacitance of 700pf for 300v input models and 580pf for 48v input models. this should be accounted for when calculating the maximum emi ?y? capacitance to meet ground leakage current specifications. break regulation am80a performance series modules are designed to deliver full rated output current at up to 0.5v above v o nom at the minimum specified input voltage. output ripple and noise am80a performance series modules are designed to generate very low ripple and noise. when mounted on logic boards, for example, sufficient decoupling is normally provided by the components used to decouple the logic ics, and no additional decoupling is required.
rev. 06 mar 03 ampss ? reference manual specifications 21 input undervoltage protection an input undervoltage protection circuit protects the module under low input voltage conditions. hysteresis is built into the am80a performance series module to allow for high levels of ripple on the input supply voltage without causing the module to cycle on and off. typically 320v modules will turn on when the input exceeds 220v and turn off below 180v. 300v modules will turn on when the input exceeds 160v and turn off below 140v. 48v modules will turn on above 33v and turn off below 28v (see electrical specifications for exact figures).
am80a performance series rev. 06 mar 03 ampss ? reference manual 22 application examples ac input design parallel connection design
rev. 06 mar 03 ampss ? reference manual specifications 23 mechanical information dimensions the dimensions are given in mm (inches). note that the baseplate must be connected to protective earth before power is supplied to the module.
control pins are tin plated phospher-bronze. input and output pins are tin plated copper. the am80a performance series module may be mounted to a board either by soldering or by using spring sockets. materials : recommended pcb layout
heatsink mounting information heatsinks for ampss tm modules are available in a variety of sizes and fin orientation. mounting kits and thermal pads are also available. the table below shows the options available for am80a performance series. a heatsink mounting kit provides the most convenient way to mount the heatsink to the module and then mount the assembly onto a circuit board 1 2 description model number dimensions free air thermal inches mm resistance heatsink, "80" size, vertical fin. apa501-80-001 4.53x2.32x0.6 115x59x15 2.7c/w heatsink, "80" size, horizontal fin apa501-80-002 4.53x2.32x0.6 115x59x15 2.4c/w heatsink, "80" size, vertical fin. apa501-80-003 4.53x2.32x0.9 115x59x22.5 2.2c/w heatsink, "80" size, horizontal fin apa501-80-004 4.53x2.32x0.9 115x59x22.5 2.0c/w heatsink, "80" size, vertical fin. apa501-80-005 4.53x2.32x1.5 115x59x37 2.0c/w heatsink, "80" size, horizontal fin apa501-80-006 4.53x2.32x1.5 115x59x37 1.7c/w heatsink, "80" size, low profile apa501-80-007 4.55x3.50x0.5 115.6x89x12 2.2c/w thermal pad, "80" size apa502-80-001 mounting kit, tapped studs apa503-00-001 mounting kit, solder studs apa503-00-002 mounting kit, tapped studs apa503-00-007 for low profile heatsink mounting kit, solder studs apa503-00-008 for low profile heatsink spring sockets (20 cont. 15pwr) apa504-00-001 to provide optimal thermal contact between heatsink and module, it is recommended that the mating surface of the heatsink should have a surface flatness of no greater than 0.1mm. the use of a thermal pad or thermal grease is also recommended. ampss tm modules may be retained by their in put and output pins only, or may be fixed to the board th cases the studs provide clearance between the module and the circuit board to facilitate pcb cleaning operations. note: 1) baseplate and heatsink must be connected to protective earth. 2) mechanical support must not induce twist in the module baseplate and must incorporate strain relief, e.g. spring washers.
the recommended torque of using ampss mounting kit for module/heatsink is: torque sequence: it is assumed that all four mounting screws are being torqued to a common surface. other thermal management schemes are at customer discretion as long as the maximum thermal rating of the specific module is not exceeded. screw size torque m3 4-6kg-cm (3.5-5.2 lb-in) m3.5 6-8kg-cm (5.2-6.9 lb-in)
europe astec europe ltd. astec house, unit 9, waterfront business park, merry hill, dudley dy5 1lx u.k. tel : 01384-842211 fax : 01384-843355 north america astec america, inc,. 5810 van allen way, carlsbad ca 92008, usa. tel : 760-930-4600 fax : 760-930-0698 for further information contact : asia astec agencies limited unit 2111-2116, level 21 223, hing fong raod kwai fong n.t. hong kong tel : 852 2437-9662 fax : 852 2402-4426 apa701-am80 rev. 06 mar03

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