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technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 1 of 15 dec 1, 2003 - revision b alq25 single output open-frame dc-dc converter module industry standard ? brick: 36v-75v input / 5v output the alq25 series is astec's next generation single output, high-density standard quarter brick offering. it operates from a 36v to 75v dc bus and comes in different isolated logic output voltages (ilo) well suited for dpa applications. it?s designed to conservatively handle 25a of output current for 5v and at high levels of efficiency (5v @ 91%). it provides tight regulation and exhibits clean and monotonic output start up characteristics. the alq25?s come with industry standard features such as input uvlo, ocp, ovp, otp, output trim, differential output sense pins. special features industry standard ? brick footprint positive and negative enable options regulation to zero load high capacitive load start-up fixed switching frequency at 200khz output trim input under-voltage lockout low profile / open-frame environmental specifications -40oc to 85oc operating temperature (200lfm) -40oc to 120oc storage temperature mtbf > 1 million hours electrical parameters input input range 36-75 vdc input surge 100v / 100ms efficiency 91% ( typ) control enable ttl compatible (positive and negative enable options) output load current 5.0v @ 25a max line regulation 0.2 % vo load regulation 0.4 % v o ripple and noise 150mv pk-pk max for 5v output voltage adjust range 10% v o transient response 5% v o deviation (typ) 50% to 75% load change 400 m m sec settling time (typ) remote sense +10 %v o over current protection 140% i o ,max safety ul + cul 60950, recognized (pending) en60950 through tuv-ps (pending)
technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 2 of 15 dec 1, 2003 - revision b alq25 series this specification covers the requirements for a new ?-brick size 25a single output high efficiency dc/dc converter. model name v out / i out construction serial no. prefix alq25a48 5.0v/25a b737 alq25a48n 5.0v/25a b742 ALQ25A48-7 5.0v/25a c511 alq25a48n-7 5.0v/25a c 514 options: suffix negative enable: "n" positive enable: no suffix 5.8mm pin option -7
technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 3 of 15 dec 1, 2003 - revision b electrical specifications standard test condition on a single module unless otherwise specified. t a 25 c (ambient air) airflow see derating curve -v in pin 1 48v 2v enable pin 2 dependent on model series +v in pin 3 return pin for +v in -v out pin 4 connected to load (return) -sense pin 5 connected to -v out trim pin 6 open +sense pin 7 connected to +v out + vout pin 8 connected to load absolute 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 operational 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 transie nt (100ms) all all v in v i n, trans 0 0 - - 80 100 vdc vdc isolation voltage input to output all - - 1500 vdc operating ambient temperature (200lfm) all t a -40 - +85 oc storage temperature all t stg -40 - 120 oc operating humidity all - - - 85 % max output power a (5.0v) p o - - 125 w
technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 4 of 15 dec 1, 2003 - revision b input specification parameter device symbol min typ max unit operating input voltage all v in 36 48 75 v dc input under-voltage lock-out t_on thresh old t_off threshold all 31 30 34 33 36 35 vdc maximum input current 1 conditions: v in = v in,min i o = i o,max ; t a = 25 oc a (5.0v) i in,max - - 6 a max p diss @ i o = 0a (v in = v in,nom ) a (5.0v) - - 7.5 w input reflected ripple current 2 conditions: p o = p o,max ; t a = 25 oc bw: 5hz to 20mhz all i i1 / i i2 - - 260 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 a (5.0v) v o,set 4.9 5.0 5.1 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 a (5.0v) a (5.0v) - - - - - - 0.1 0.2 - 0.2 0.4 0.02 % vo % vo % / c ripple and noise 3 peak-to-peak: (5hz to 20mhz) a (5v) - 150 mvp-p output current 4 a (5v) i o 0 - 25 a external load capacitance a (5v) - 470 - 8000 m f output current-limit inception v out = 90% v o,set a (5v) i o 27.5 - 35 a
technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 5 of 15 dec 1, 2003 - revision b output specifications parameter device symbol min typ max unit over voltage protection range a (5.0v) 6 7 v over temperature range (avg pcb temperature) all 110 - 120 c efficiency v in = v in-nom ; i o = i o,max t a =25 c a (5.0v) h 89 91 - - - - % turn-on response time v in = v in-min to v in-max all - - - 20 ms switching frequency all - - 200 khz dynamic response 5 : d i o / d t=0.1a / us load change from i o = 10% to 100% 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 5v 5v - - - - - - - - - - - - - - 0.1 250 400 - 500 250 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. see figure 2 for ripple and noise test measurement setup. 4. appropriate thermal derating applies. see figure 13 for the thermal derating curves 5. the dynamic deviation and recovery time are defined as below
technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 6 of 15 dec 1, 2003 - revision b 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 - - -0.7 3.5 - - 1.2 12 v v positive enable (no suffix) enable pin voltage for module on module off no suffix - - 3.5 -0.7 - - 12 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 basic operation and feature section 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 point 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 - - 1000 - pf isolation resistance all - 10 1000 - m w safety approval the alq25 series have been certified through: ul + cul 60950, third edition - recognized en 60950 through tuv-ps basic insulation
technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 7 of 15 dec 1, 2003 - revision b 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.) a way 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 ripple current with a simulated source inductance (ltest) of 12uh. capacitor cs offsets pos sible battery/ source impedance. measure current as shown above.
technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 8 of 15 dec 1, 2003 - revision b load +vin -vin cnt1 +vout -vout +sense -sense trm f1 cin vin co1 co2 s1 figure 3 . setup for parametric test. f1: fuse*: use external fuse (fast blow type 10a ) for each unit. cin: recommended input capacitor 100 u f/100v high frequency low esr electrolytic type capacitor . (nichicon kme serial or equate.) co1: recommended 1 u f / 25 v ceramic capacitor co2: recommended output capacitor 1000 u f/ 10 v high frequency low esr electrolytic type capacitor. (nichicon lxv serial or equate.)
technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 9 of 15 dec 1, 2003 - revision b +vin -vin enable -vout +vout -sense +sense trim rload radj_up figure 3. external resistor configuration to increase the outputs +vin -vin enable -vout +vout -sense +sense trim rload radj_down figure 4. external resistor configuration to decrease the outputs basic operation and features input under voltage lockout to prevent any instability to the converter, which may affect the end system, the alq25 series have been designed to turn-on once v in is in the voltage range of 34 - 36 vdc. likewise, it has also been programmed to turn-off when v in drops down to 33 - 35 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 between trim pin (pin6) and +sense pin (pin 7). please refer to equation (1) for the required external resistance and output adjust relationship. equation (1): ( ) ) ( 2 . 10 % 510 % 225 . 1 % 100 1 . 5 w - d - d d + = - k v r o up adj to decrease the output, external r adj_down resistor should 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. ) ( 2 . 10 % 510 w - d = - k r down adj
technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 10 of 15 dec 1, 2003 - revision b output enable the alq25 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 part 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 turns 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 consists of circuitry that monitors the voltage on the output terminals. if the output voltage exceeds the over voltage protection threshold limit, module will work on intermittent model. when the over voltage condition is removed, the module will automatically restart. the protection mechanism is such that the unit can continue in this condition until the fault is cleared. over current protection (ocp) the over current protection circuit comes in latching mode. the converter is latched off if the load current on the output reaches the ocp threshold limit. the ocp latch can be reset either by cycling the input voltage or toggling the enable signal for 100ms. consult factory for auto-restart option. the over current protection (ocp) circuit comes in foldback current limit. if output current exceed the ocp threshold limit, or at a short circuit condition, the module will work on intermittent model. when the over current condition is removed, the module will automatically restart. over temperature protection (otp) these modules feature an over-temperature protection circuit to safeguard against thermal damage. t he module will work on intermittent mode when the maximum device reference temperature is exceeded. when the over-temperature condition is removed, the converter will automatically restart
technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 11 of 15 dec 1, 2003 - revision b performance curves alq25a48 (5.0v) series figure 5. efficiency vs. load current curves at t a =25 c for 36vin figure 6. efficciency vs load current curves at t a =25 c for 48vin figure 7. figure 6. efficciency vs load current curves at t a =25 c f or 75 vin efficiency vs. load curve 0 10 20 30 40 50 60 70 80 90 100 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% load [a] efficiency [%] min max ave efficiency vs. load curve 0 10 20 30 40 50 60 70 80 90 100 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% load (a) efficiency (%) min max ave efficiency vs. load curve 0 10 20 30 40 50 60 70 80 90 100 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% load (a) efficiency (%) min max ave
technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 12 of 15 dec 1, 2003 - revision b current vs. temperature curves derating curve of alq25 a48. alq25a48 36v derating curve 0.0 5.0 10.0 15.0 20.0 25.0 25 40 55 70 85 temperature (c) output current (a) 000 lfm 100 lfm 200 lfm 300lfm 400 lfm alq25a48 48v derating curve 0.0 5.0 10.0 15.0 20.0 25.0 25 40 55 70 85 temperature (c) output current (a) 000 lfm 100 lfm 200 lfm 300 lfm 400 lfm
technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 13 of 15 dec 1, 2003 - revision b alq25a48 75v derating curve 0.0 5.0 10.0 15.0 20.0 25.0 25 40 55 70 85 temperature (c) output current (a) 000 lfm 100 lfm 200 lfm 300 lfm 400 lfm
technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 14 of 15 dec 1, 2003 - revision b mechanical specifications figure 15. alq25 series mechanical outline drawing parameter device symbol min typ max unit dimension all l - 2.28 [57.9] - in [ mm ] w - 1.45 [36.8] - in [ mm ] h - 0.43 [9.70] - in [ mm ] weight - g [oz] pin assignment j1 -v in j5 -sense j2 enable j6 trim j3 +v in j7 +sense j4 -v o j8 +v o
technical reference notes alq25 series (open frame single output quarter brick) model: alq25 series sheet 15 of 15 dec 1, 2003 - revision b mechanical specifications (continued) soldering considerations the alq25 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 with cleaning solvent ipa or with water. part numbering scheme for ordering output current output voltage input voltage enable logic alq25 x 48 y a = 5.0v n = negative enable ?blank? = positive enable (default) please call 1-888-41-astec for further inquiries or visit us at www.astecpower.com

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