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technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 1 of 16 april 21, 2003 - revision a (preliminary) alq50 single output open - frame dc - dc converter module industry standard ? brick: 36v - 75v input / 50a output current the alq50 series is astec's next generation single output, high - density standard quarter brick offering. it operates from a 36v to 75v d c bus and comes in different isolated logic output voltages (ilo) well suited for dpa applications. it?s designed to conservatively handle 50a of output current for 2.5v and below at high levels of efficiency (3.3v @ 90.5%). it provides tight r egulation and exhibits clean and monotonic output start up characteristics. the alq50?s come with industry standard features such as input uvlo, ocp, ovp, otp, output trim, differential output sense pins. with its 0.36? low profile and open frame construct ion, it offers optimum board mounting flexibility. special features industry standard ? brick footprint positive and negative enable options regulation to zero load high capac itive load start - up fixed switching frequency at 480khz output trim input under - voltage lockout low profile / open - frame environmental specifications - 40oc to 85oc operating temperature - 40oc to 125oc storage temperature mtbf > 1 million hours electrical parameters input input range 36 - 75 vdc input surge 100v / 100ms efficiency 3.3v @ 90.5% (typ) 2.5v @ 90.0% 1.8v @ 89.0% 1.2v @ 86.5% control enable ttl compatible (positive and negative ena ble options) output load current 2.5v @ 50a max line/load regulation < 1% v o ripple and noise 60mv pk - pk max output voltage adjust range 10% v o transient response 5 % v o deviation (typ) 50% to 75% load change 250 m sec settling time (typ) remote sense + 10% v o over current protection 1 2 0% i o,max safety ul + cul 60950, recognized (pending) en60950 through tuv - ps (pending) prelimin ary
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 2 of 16 april 21, 2003 - revision a (preliminary) alq50 series this specification covers the requirements for a new ? - brick size 50a single output high efficiency dc/dc converter. model name construction v out / i out alq40f48 open frame; low profile 3.3v / 40a alq50g48 open frame; low profile 2.5v / 50a alq50y48 open frame; low profile 1.8v / 50a alq50k48 open frame; low profile 1.2v / 50a options: suffix negative enable: "n" positive enable: no suffix
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 3 of 16 april 21, 2003 - revision a (preliminary) electrical specifications standard test condition on a single module unless otherwise specified. t a 25 c (ambient air) airflow refer to figures 21 to 24 +v in pi n 1 return pin for +v in enable pin 2 dependent on model series - v in pin 3 48v 2v - v out pin 4 connected to load - sense pin 5 connected to +v out trim pin 6 open +sense pin 7 connected to - v out +vout pin 8 connected to load (return) abso lute maximum ratings stresses in excess of the absolute maximum ratings can cause permanent damage to the converter. functional operation of the device is converter is not implied at these or any other conditions in excess of those given in the operationa l section of the specs. exposure to absolute maximum ratings for extended period can adversely affect device reliability. parameter device symbol min typ max unit input voltage 1 continuous transient (100ms) all all v in v i n, trans 0 0 - - 75 100 vdc vdc isolation voltage input to output all 1500 - - vdc operating ambient temperature all t a - 40 - +85 oc storage temperature all t stg - 40 - 125 oc operating humidity all - - - 85 % maximum enable voltage all 25 vdc max output powe r f (3.3v) p o - - 132 w g (2.5v) p o - - 125 w y (1.8v) p o - - 90 w k (1.2v) p o - - 60 w
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 4 of 16 april 21, 2003 - revision a (preliminary) electrical specifications ( continued) input specification parameter device symbol min typ max un it operating input voltage all v in 36 48 75 v dc input under - voltage lock - out t_on threshold t_off threshold all 33 32 - - 35 34 vdc maximum input current 1 conditions: v in =v in,min i o = i o,max ; t a = 25 oc f (3.3v) g (2.5v) y (1.8v) k (1.2v) i in,max - - - - - - - - 4.4 4.3 3.2 2.3 a max p diss @ i o = 0a (v in = v in,nom ) 3v3 (f) 2v5 (g) 1v8 (y) 1v2 (k) - - - - - - - - 5 5 3.3 2.5 w input reflected ripple current 2 conditions: p o = p o,max ; t a = 25 oc bw: 5hz to 20mhz al l i i1 / i i2 - - 10 ma pk - pk note: 1. an input line fuse is recommended for use. 2. external input capacitance required. see input ripple current test measurement setup on fig 1. output specifications parameter device symbol min typ max unit output voltage set point v in = v in, min to v in, max; i o =i o,max 3v3 (f) 2v5 (g) 1v8 (y) 1v2 (k) v o,set 3.260 2.465 1.770 1.180 3.300 2.500 1.800 1.200 3.340 2.535 1.830 1.220 vdc vdc vdc vdc output regulation line: v in = v in, min to v in, max load: i o = i o, min to i o, max temperature: ta = - 40 oc to +85oc all 1v2 (k) all 1v2 (k) all - - - - - - - - - 0.20 0.30 0.20 0.30 1.00 %vo ripple and noise 4 peak - to - peak: (5hz to 20mhz) 1v2 1v8/2v5 3v3 - - - - 25 35 45 50 75 100 mvp - p mvp - p mvp - p output current 3 3v3 all i o 0 0 - - 40 50 a external load capacitance capacitor esr all - - 4 - - 25,000 - m f m w output current - limit inception v out = 90% v o,set 5 3v3 all i o 41 52 - - 52 68 a
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 5 of 16 april 21, 2003 - revision a (preliminary) electrical specifications ( continued) output specifications parameter device symbol min typ max un it over voltage prot ection range 7 3v3 (f) 2v5 (g) 1v8 (y) 1v2 (k) 3.9 3.0 2.0 1.4 4.1 3.2 2.4 1.6 4.9 3.9 2.9 2.1 v over temperature range 6 (avg pcb temperature) all 110 - 120 c efficiency v in = v in - nom ; i o = i o,max t a =25 c 3v3 (f) 2v5 (g) 1v8 (y) 1v2 (k) h h h h 89.5 89.0 88.0 85.5 90.5 90.0 89.0 86.5 - - - - % % % % turn - on response time v in = v in - min to v in - max all - - - 15 ms switching frequency all 2v5 - - 440 490 480 540 520 590 khz khz dynamic response: d i o / d t=0.1a / us c o = 0uf loa d change from i o = 50% to 75% of i o, max : peak deviation settling time to v o, nom load change from i o = 50% to 25% of i o, max : peak deviation settling time to v o, nom 1v2/1v8 2v5/3v3 all 1v2/1v8 2v5/3v3 all - - - - - - - - - - - - - - 0.1 100 125 250 100 115 250 - 140 165 500 140 150 500 a/ m s mv m s mv m s output overshoot at t - on / t - off passive resistive full load all - - - 5 %vo note: 3. appropriate t hermal derating applies. see appendix b for the thermal derating curves 4. see figure 2 for ripple and noise test measurement setup. 5 . in an event of an over current condition - the converter will be latched off . restart is possible either by cycling the input voltage or toggling the enable signal for 100ms . consult factory for au to restart option. 6. output of the module will be terminated once the operating temp reaches the otp range. normal operation resumes once the temperature falls below the otp range. 7. th e ovp mode is latching. the converter will be latched of f once the sensed voltage across the output pins exceeds the threshold limits. restart is possible by either cycling the input voltage or toggling the enable signal for 100ms.
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 6 of 16 april 21, 2003 - revision a (preliminary) electrical specifications ( continued) feature specification parameter device symbol min typ max unit output enable on/off 10 negative enable ("n" suffix) enable pin voltage for module on module off n suffix - - 0 2.95 - - 1.2 20.0 v v positive enable (no suffix) enable pin voltage for module on module off no suffix - - 2.95 0 - - 20.0 1.2 v output voltage remote sensing 11,13 all - - - 10 %v o output voltage trim range 12,13 all 90 110 %v o note: 10. see appendix a.3 for the recommended/ appropriate module enable configuration. 11. the sense pins can be used to compensate for any voltage drops (per indicated max limits) that may occur along the connection between the output pins to the load. pin 7 (+sense) and pin 5 ( - sense) should be connected to pin 8 (+vout) and pin 4 (return) respectively at the poin t where regulation is desired. 12. refer to equation (1) and (2) and figures 3 and 4 for the output trim adjust configuration. 13. the combination of remote sense and trim adjust cannot exceed 110% of v o, nom . isolation specification parameter device symbol min typ max unit isolation capacitance all - - 2.70 - nf isolation resistance all - 10 - - m w safety approval the alq50 series have been certified through: ul + cul 60950, third edition - recognized (pending ) en 60950 through tuv - ps (pending) \ basic insulation
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 7 of 16 april 21, 2003 - revision a (preliminary) electrical specifications ( continued) figure 2. peak to peak output noise measurement setup. figure 1. input reflected ripple current measurement setup. vo(+) vo(-) resistive load 10 uf 1 uf scope copper strip note: use a 1 m f 50v x7r ceramic capacitor and a 10 m f 25v tantalum cap. scope measurement should be made using a bnc probe socket positioned about 76mm (3 in.) away from the module?s output terminals. the ext. capacitors should be placed between the bnc socket and the module?s output terminals, with a minimum distance of 51mm (2in.) from the latter. battery cs 220 uf esr < 0.1 ohm @ 20 oc, 100 khz ltest 12 uh 33 uf esr < 0.7 ohm @ 20 oc, 100 khz vi(+) vi(-) to oscilloscope note: measure the input reflected r ipple current with a simulated source inductance (ltest) of 12uh. capacitor cs offsets possible battery/ source impedance. measure current as shown above.
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 8 of 16 april 21, 2003 - revision a (preliminary) +vin -vin enable -vout +vout -sense +sense vadj rload radj_up figure 3. external resistor configuration to increase the outputs +vin -vin enable -vout +vout -sense +sense vadj rload radj_down figur e 4. external resistor configuration to increase the outputs basic operation and features input under voltage lockout to prevent any instability to the converter, which may affect the end system, the alq50 series have been designed to turn - on once v in is in the voltage range of 33 - 35 vdc. likewise, it has also been programmed to turn - off when v in drops down to 32 - 34 vdc. output voltage adjust/trim the converter comes with a trim pin (pin 6), which is used to adjust the output by as much as 90% to 110% of its set point. this is achieved by connecting an external resistor as described below. to increase the output, external r adj_up resistor should be connected be tween trim pin (pin6) and +sense pin (pin 7). please refer to equation (1) for the required external resistance and output adjust relationship. 3.3v/2.5v/1.8v equation (1a): 1.2v equation (1b): to decrease the output, external r adj_down resistor sh ould be connected between trim pin (pin 6) and - sense pin (pin 5). please refer to equation (2) for the required external resistance and output adjust relationship. equation (2) radj_up 5.1 vo 100 d % + ( ) 1.225 d % 510 d % - 10.2 - ? ? ? ? k w radj_up 5.1 vo 100 d % + ( ) 0.6 d % 510 d % - 10.2 - ? ? ? ? k w radj_down 510 d % 10.2 - ? ? ? ? k w
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 9 of 16 april 21, 2003 - revision a (preliminary) basic operation and features (continued) output enable the alq50 series comes with an enable pin (pin 2), which is primarily used to turn on/off the converter. both a positive (no part number suffix required) and a negative (suffix ?n? required) enable logic options are being offered. please refer to table 2 for the pa rt numbering scheme. for positive enable, the converter is turned on when the enable pin is at logic high or left open. the unit turns off when the enable pin is at logic low or directly connected to - v in . on the other hand, the negative enable version t urns unit on when the enable pin is at logic low or directly connected to - v in . the unit turns off when the enable pin is at logic high. output over voltage protection (ovp) the over voltage protection circuit com es in latching mode. the converter is latched off if the output voltage exceeds the ovp threshold limit s . the ovp latch is reset either by cycling t he i nput voltage or toggling the enable signal for 100ms . over current protection (ocp) the over current protection circuit comes in latching mode. t he converter is latched off if the load current on the output reaches the ocp threshold limit . the ocp latch can be res e t either by cycling the input voltage or toggling the enable signal for 100ms. consult factory for auto - res tart option . over temperature protection (otp) the over temperatu re protection circuit will shutdown the converter once the average pcb temperature reaches the otp range. this feature prevents the unit from overheating and consequently going into thermal runaway, which may further damage the converter and the end system . such overheating may be an effect of operation outside the given power thermal derating conditions. restart is possible once the temperature of the sensed location drops to less than 110 c.
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 10 of 16 april 21, 2003 - revision a (preliminary) performance curves alq40f48 (3.3v) series efficiency vs. load current, t a =25c 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 0 10 20 30 40 output current (amps) efficiency vin = 36vdc vin = 48vdc vin = 75vdc power dissipation vs output current, t a =25c 0 4 8 12 16 20 0 10 20 30 40 output current (amps) power dissipation (watts) vin = 36 vdc vin = 48 vdc vin = 75 vdc efficiency vs load current, t a =85c 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 0 10 20 30 40 output current (amps) efficiency vin = 36v vin = 48v vin = 75v power dissipation vs output current, t a =85c 0 4 8 12 16 20 0 10 20 30 40 output current (amps) power dissipation (watts) vin = 36 vdc vin = 48 vdc vin = 75 vdc figure 5. efficiency vs. load current curves at t a =25 c for different input voltages with 300 lfm airflow directed from pins 3 to 1. figure 6. power dissipation vs. load current at t a =25 c for diff erent input voltages with 300lfm airflow directed from pins 3 to 1. figure 7. efficiency vs. load current curves at t a =85 c for different input voltages with 300 lfm airflow directed from pins 3 to 1. figure 8. power dissipation vs. load current at t a =85 c for different input voltages with 300lfm airflow directed from pins 3 to 1.
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 11 of 16 april 21, 2003 - revision a (preliminary) performance curves (continued) alq50g48 (2.5v) series efficiency vs output current, t a = 25c 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 0 10 20 30 40 50 output current (amps) efficiency vin = 36vdc vin = 48vdc vin = 75vdc power dissipation vs output current, t a = 25c 0 4 8 12 16 20 0 10 20 30 40 50 output current (amps) power dissipation (watts) vin = 36 vdc vin = 48 vdc vin = 75 vdc efficiency vs output current, t a = 85c 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 0 10 20 30 40 50 output current (amps) efficiency vin = 36 vdc vin = 48 vdc vin = 75 vdc dissipation vs output current, t a = 85c 0 4 8 12 16 20 0 10 20 30 40 50 output current (amps) power dissipation (watts) vin = 36 vdc vin = 48 vdc vin = 75 vdc figure 9. efficiency vs. load current curves at t a =25 c for different input voltages with 300 lfm airflow directed from pins 3 to 1. figure 10. power dissipat ion vs. load current at t a =25 c for different input voltages with 300 lfm airflow directed from pins 3 to 1. figure 11. efficiency vs. load current curves at t a =85 c for different input voltages with 300 lfm airflow directed from pins 3 to 1. figure 12. p ower dissipation vs. load current at t a =85 c for different input voltages with 300 lfm airflow directed from pins 3 to 1.
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 12 of 16 april 21, 2003 - revision a (preliminary) performance curves (continued) alq50y48 (1.8v) series efficiency vs. load current, t a =25c 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 0 10 20 30 40 50 output current (amps) efficiency vin = 36vdc vin = 48vdc vin = 75vdc power dissipation vs output current, t a =25c 0 4 8 12 16 20 0 10 20 30 40 50 output current (amps) power dissipation (watts) vin = 36 vdc vin = 48 vdc vin = 75 vdc efficiency vs output current t a = 85c 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 0 10 20 30 40 50 output current (amps) efficiency vin = 36 vdc vin = 48 vdc vin = 75 vdc dissipation vs output current, t a = 85c 0 4 8 12 16 20 0 10 20 30 40 50 output current (amps) power dissipation (watts) vin = 36 vdc vin = 48 vdc vin = 75 vdc figure 13. efficiency vs. load current curves at t a =25 c for different input voltages with 300 lfm airflow directed from pins 3 to 1. figure 14. power dissipation vs. load current at t a =2 5 c for different input voltages with 300 lfm airflow directed from pins 3 to 1. figure 15. efficiency vs. load current curves at t a =85 c for different input voltages with 300 lfm airflow directed from pins 3 to 1. figure 16. power dissipation vs. load c urrent at t a =85 c for different input voltages with 300 lfm airflow directed from pins 3 to 1.
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 13 of 16 april 21, 2003 - revision a (preliminary) performance curves (conti nued) alq50k48 (1.2v) series efficiency vs output current, t a = 25c 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 0 10 20 30 40 50 output current (amps) efficiency vin = 36vdc vin = 48vdc vin = 75vdc power dissipation vs output current, t a = 25c 0 4 8 12 16 20 0 10 20 30 40 50 output current (amps) power dissipation (watts) vin = 36 vdc vin = 48 vdc vin = 75 vdc efficiency vs output current, t a = 85c 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 0 10 20 30 40 50 output current (amps) efficiency vin = 36 vdc vin = 48 vdc vin = 75 vdc dissipation vs output current, t a = 85c 0 4 8 12 16 20 0 10 20 30 40 50 output current (amps) power dissipation (watts) vin = 36 vdc vin = 48 vdc vin = 75 vdc figure 17. efficiency vs. load current curves at t a =25 c for different input voltages with 300 lfm airflow directed fro m pins 3 to 1 . figure 18. power dissipation vs. load current at t a =25 c for different input voltages with 300 lfm airflow directed from pins 3 to 1 . figure 19. efficiency vs. load current curves at t a =85 c for different input voltages with 300 lfm airflo w directed from pins 3 to 1 . figure 20. power dissipation vs. load current at t a =85 c for different input voltages with 300 lfm airflow directed from pins 3 to 1 .
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 14 of 16 april 21, 2003 - revision a (preliminary) performance curves (continued) current vs. temperature curves 3.3v derating, 48v input 0 5 10 15 20 25 30 35 40 25 35 45 55 65 75 85 ambient temperature (c) output current (a) 0 lfm (0 m/s) 100 lfm (0.5m/s) 200 lfm (1.0 m/s) 400 lfm (2.0 m/s) 2.5v derating, 48v input 10 15 20 25 30 35 40 45 50 25 35 45 55 65 75 85 ambient temperature (c) output current (a) 0 lfm (0 m/s) 100 lfm (0.5m/s) 200 lfm (1 m/s) 400 lfm (2 m/s) 1.8v derating, 48v input 10 15 20 25 30 35 40 45 50 25 35 45 55 65 75 85 ambient temperature (c) output current (a) 0 lfm (0 m/s) 100 lfm (0.5m/s) 200 lfm (1.0 m/s) 400 lfm (2.0 m/s) 1.2v derating, 48v input 10 15 20 25 30 35 40 45 50 25 35 45 55 65 75 85 ambient temperature (c) output current (a) 0 lfm (0 m/s) 100 lfm (0.5m/s) 200 lfm (1.0 m/s) 400 lfm (2.0 m/s) figure 21. alq40f48 (3.3v) output derating curves at various airflow conditions directed across p in 3 to 1 with the module mounted vertically. figure 22. alq50g48 (2.5v) output derating curves at various airflow conditions directed across pin 3 to 1 with the module mounted vertically. figure 23. alq50y48 (1.8v) output derating curves at various airflow conditions directed across pin 3 to 1 wi th the module mounted vertically. figure 24. alq50k48 (1.2v) output derating curves at various airflow conditions directed across pin 3 to 1 with the module mounted vertically.
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 15 of 16 april 21, 2003 - revision a (preliminary) mechanical specifications parameter device symbol min typ max unit dimension all l - 2.30 [58.42] - in [ mm ] w - 1.48 [37.59] - in [ mm ] h - 0.36 [9.10] - in [ mm ] weight - g [oz] pin assignment 1 +v in 5 - sense 2 enable 6 trim 3 - v in 7 +sense 4 - v o 8 +v o 0.15 [3.8] 2.00 [50.8] 1.04 [26.4] 0.44 [11.2] l c 0.74 [18.8] 1.04 [26.5] 0.89 [22.7] 0.74 [18.9] 0.59 [15.0] 0.44 [11.2] 1 +vin 2 enable 3 -vin 4 -vout 5 -sense 6 trim 7 +sense 8 +vout pin side down [58.4] 3 2 1 1.48 [37.6] side view 0.36 [9.1] 8 7 6 5 4 pin assignment 0.20 min [5.0] [6.0] 0.24 max 0.06? 0.04? [1.5?] 2 places [1.0?] 6 places figure 25. alq50 series mechanical outline drawing
technica l reference notes alq40/50 series (open frame single output quarter brick) model: alq50 series sheet 16 of 16 april 21, 2003 - revision a (preliminary) mechanical specifications (continued) soldering considerations the alq50 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 260 c for less than 10 seconds. when hand soldering, the iron temperature should be maintained at 425 c and applied to the converter pins for less than 5 seconds. longer exposure can cause internal damage to the converter. cleaning can be performed wi th cleaning solvent ipa or with water. part numbering scheme for ordering output voltage enable logic alq40 / 50 x 48 y f = 3.3v n = negative enable g = 2.5v ?blank? = positive enable (default) y = 1.8v k = 1.2v please call 1 - 888 - 41 - astec for further inquiries or visit us at www.astecpower.com

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