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technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 1 of 18 october 4, 2002 - revision a1 alq15 dual output open-frame dc-dc converter module industry standard ? brick: 36v-75v input / 60w output power the alq15 series is astec's latest dual output; high-density converter offering that comes in an industry standard ? brick open-frame package. with its independently controlled output rails, the module practically eliminates cross regulation effects which has been an issue to most dual converters available in the market. the alq15 series has been designed to deliver 60w of clean, well-regulated, low noise dc power for today's demanding loads at respectable efficiency levels: 3.3v-2.5v combination @ 87% (60w output power). output combinations currently available are 3.3v/2.5v - 3.3v/1.8v - 2.5v/1.5v, with each output rail able to deliver 15a max. the module comes with standard feature sets such as output enable with positive or negative options; output voltage-adjust; over current, over voltage and over temperature protection. in addition, it is also being offered at both 5mm (std) and 3.7mm pin lengths. special features tightly regulated for a dual output at < 1% low ripple and noise at < 30mv pk-pk industry standard ? brick footprint positive and negative enable options regulation to zero load high capacitive load start-up fixed switching frequency at 350khz output trim input under-voltage lockout 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/2.5v @ 87% (typ at 60w) 3.3v/1.8v @ 86% 2.5v/1.5v @ 83% control enable ttl compatible (positive and negative enable options) output load current 15a max per channel (60w max) regulation < 1% v o ripple and noise 30mv pk-pk max output voltage adjust range 10% v transient response 2% v o deviation (typ) 50% to 75% load change < 300 m m sec settling time (typ) over current protection 135% i o ,max safety ul + cul 60950, recognized (pending) en60950 through tuv-ps (pending)
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 2 of 18 october 4, 2002 - revision a1 alq15 series this specification covers the requirements for a new ?-brick size 15a/channel dual output high efficiency dc/dc converter. model name construction v out / i out alq15fg48 open frame 3.3v-15a / 2.5v-1 5a alq15fy48 open frame 3.3v-15a / 1.8v-15a alq15gm48 open frame 2.5v-15a / 1.5v-15a alq15af48 open frame 5.0v-12a / 3.3v-15a options: suffix negative enable: "n" positive enable: no suffix 3.7mm (nom) pin length: "-6"
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 3 of 18 october 4, 2002 - revision a1 electrical specifications standard test condition on a single module unless otherwise specified. ta: 25oc (ambient air) +v in : pin 1 48v 2v enable: pin 2 open (positive enable) -v in : pin 3 return pin for +vin +v out2 : pin 4 connect to load 2 -v out : pin 5 return pin for load 1 & 2 trim: pin 6 open +v out1 : pin 7 connect to load 1 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: continuous transient(100ms) : all all v in v i n, trans 0 0 - - 75 100 vdc vdc operating ambient temperature 1 all t a -40 - +85 oc storage temperature all t stg -55 - 125 oc operating humidity all - - - 85 % i/o isolation all - 1500 - - vdc maximum enable voltage all tbd vdc note: 1. power must be derated at 85 o c (refer to figures 15 to 17).
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 4 of 18 october 4, 2002 - revision a1 electrical specifications ( continued) input specification parameter device symbol min typ max unit operating input voltage all v in 36 48 75 v dc maximum input current 2 conditions: v in = between 0 to v in,min i o = i o,max ; t a = 25 oc all i in,max - - 2.25 a input reflected ripple current 3 conditions: p o = p o,max ; t a = 25 oc all i i1 / i i2 - 10 25 ma pk-pk standing loss condition: v in = v in,nom ; t a = 25 oc all - - - 3.5 w note: 2. this power module is not internally fused. an in put line fuse (e.g. little fuse 3ab /322003 or 314003) is recommended. 3. see figure 1 for input reflected ripple current test setup. output specifications parameter device symbol min typ max unit voltage setpoint conditions: v i = v in,nom ; t a = 25 oc; v o1 : i o1 = i o,max ; p o = 60w v o2 : i o2 = i o,max ; p o = 60w fg fy gm af v o1 / v o2 v o1 / v o2 v o1 / v o2 v o1 / v o2 3.25 / 2.46 3.25 / 1.76 2.46 / 1.47 4.93 / 3.25 3.30 / 2.50 3.30 / 1.80 2.50 / 1.50 5.00 / 3.30 3.35 / 2.54 3.35 / 1. 84 2.54 / 1.53 5.08 / 3.35 vdc vdc vdc vdc load current 3.3v 2.5v 1.8v 1.5v 5.0v i o1 /i o2 i o1 /i o2 i o1 /i o2 i o1 /i o2 i o1 /i o2 0 0 0 0 0 - - - - - 15.0 15.0 15.0 15.0 12.0 a a a a a combined output power p o = p o1 + p o2 fg fy gm af p o p o p o p o - - - - - - - - 60 60 60 60 w w w w line regulation: conditions: v in = v in,min to v in,max ; i o1 = i o,max , i o2 = i o,min v i = v in,min to v in,max ; i o1 = i o,min , i o2 = i o,max all - - 0.1 %vo
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 5 of 18 october 4, 2002 - revision a1 electrical specifications ( continued) output specifications parameter device symbol min typ max unit regulation load 4 conditions: i o = 1a to i o,max ; v in =v in,nom all - - 1.0 %vo temperature conditions: t a = -40 oc to +65 oc; v in = v in,nom ; i o = i o,max all - - 2 %vo output ripple and noise: peak-to-peak 5 conditions: i o = i o,max ; v in =v in,nom ; bw = 20 mhz; t a =25 o c 3.3 2.5 1.8 1.5 5.0 - - - - - - - - - - 30 30 30 30 30 mv pk-pk mv pk-pk mv pk-pk mv pk-pk mv pk-pk external load capacitance 6 all - - 10000 m f over current limit inception conditions: vo = 90% v o,nom ; i o2 = i o,min; v in = v in,nom characteristics: hiccup mode, auto-recovery all 5.0v i o,ocp i o,ocp 16.5 13.2 - - 25 20 a a output short circuit conditions: v in = v in,nom ; i o2 = 0a t a = 25 oc all i opk i orms i odc i ins - - 28 5 1 150 a p k a rms a ma efficiency conditions: v in = v in,nom ; t a = 25 oc p o = p o,max , balanced current loading fg fy gm af h h h h 85.0 84.0 81.0 87.5 87.0 86.0 83.0 88.5 % % % % switching frequency note: can be determined from output ripple waveform all - 225 250 275 khz note: 4. channel under test shall follow the specified conditions while the other channel is set to min load, 0a. 5. channel under test shall be set to full load with the other channel set to i o, min - see fig 2. 6. refer to ysc plots on fig 18 and 19 to determine loop stability at various output load impedance.
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 6 of 18 october 4, 2002 - revision a1 electrical specifications ( continued) output specifications parameter device symbol min typ max unit dynamic response 7 conditions: d i o / d t = 1a/10 m s ; v in = v in,nom ; t a = 25 c peak voltage deviation load change: i o = 50% to 75% i o,max all - - 2 4 %vo transient settling time note: v o,nom (ref.) (from ref. to 0.1 d v pk ) all - - - 500 m sec peak voltage deviation load change: i o = 50% to 25% i o,max all - - 2 4 %v o transient settling time note: v o,nom (ref.) (from ref. to 0.1 d v pk ) all - - - 500 m sec turn-on time conditions: v in = v in,min; i o1 = i o,max , i o2 = i o,min ; t a = 25 c note: v o1 within 1% all - - 6 32 msec output voltage overshoot conditions: v in = v in,nom ; t a = 25 c; p o = 0w all - - - 4 %v o note: 7. dynamic response tested with 10uf-aluminum and 1uf-tantalum capacitors across the load. feature specification parameter device symbol min typ max unit undervoltage lockout turn-on point turn-off point all all - - - 32 34.5 33.5 36.0 - v v output voltage adjustment range conditions: v in = v in,nom ; t a = 25 c v o1 : i o1 = i o,max , i o2 = i o,min v o2: i o1 = i o,min ; i o2 = i o,max note: tolerance = 1% all - 90 - 110 %v o
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 7 of 18 october 4, 2002 - revision a1 electrical specifications ( continued) feature specification parameter device symbol min typ max unit enable pin voltage positive logic logic low: module off logic high: module on w/o n- suffix v enable v enable 0 1.8 - - 2.5 5.0 v v neg ative logic logic low: module on logic high: module off n- suffix v enable v enable 0 1.8 - - 2.5 5.0 v v enable pin current logic low logic high: (i lkg at v enable = 5v) all all i enable i enable - - - - 1.0 50 ma m a module output voltage at logic high (negative enable) at logic low (positive enable) n- suffix w/o n- suffix v o v o - - - - 1.2 1.2 v v output over voltage clamp conditions: v in = v in,nom ; t a = 25 c characteristics: latching mode; auto-tracking wrt vout trim 3.3v 2.5v 1.8v 1.5v 5.0v v o,clamp v o,clamp v o,clamp v o,clamp v o,clamp 3.8 2.8 2.0 1.7 5.7 3.9 2.9 2.1 1.8 6.0 4.5 3.5 2.5 2.2 6.3 v v v v v over-temperature shutdown note: 1. t comp(max) < 140 c 2 . measured in the vicinity of pin 3 and r29 all t b 110 115 120 c isolation specification parameter device symbol min typ max unit isolation capacitance all - - 680 - pf isolation resistance all - 10 - - m w
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 8 of 18 october 4, 2002 - revision a1 safety approval the alq15 series have been certified through: ul + cul 60950, third edition - recognized (pending) en 60950 through tuv-ps (pending) basic insulation figure 2. peak to peak output noise measurement setup. figure 1. input reflected ripple current measurement setup. 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. ca pacitor cs offsets possible battery/ source impedance. measure current as shown above. 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 bet ween the bnc socket and the module?s output terminals, with a minimum distance of 51mm (2in.) from the latter.
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 9 of 18 october 4, 2002 - revision a1 basic operation and features input under voltage lockout to prevent any instability to the converter that may affect and consequently damage the end system, the alq15 series have been designed to turn-on once v in is in the voltage range of 34.5-36 vdc. likewise, it has also been programmed to turn-off when v in drops down to 32-33.5 vdc. output voltage adjust/trim the converter comes with a trim pin (pin 6) which is used to adjust both outputs simultaneously 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 voltages, external r trim-up resistor should be connected between trim pin (pin6) and rtn pin (pin 5). please refer to figure 3 for the resistor configuration and table 1 for the required resistor value in attaining the desired output adjustment to decrease the output voltages, external r trim-down resistor should be connected between trim pin (pin 6) and v out1 (pin 7). please refer to figure 4 for the resistor configuration and table 1 for the required resistor value in attaining the desired output adjustment. table 1. external trim resistor values to adjust the output voltages (in k w w ) alq15fg48 (3.3v / 2.5v) alq15fy48 (3.3v / 1.8v) alq15gm48 (2.5v / 1.5v) trim up trim down trim up trim down trim up trim down d d [%] r trim-up r trim-dowm r trim-up r trim-dowm r trim-up r trim-dowm 1 46.84 49.64 55.34 67.64 58.48 58.57 2 20.82 23.11 24.59 30.06 24.64 27.26 3 12.14 13.69 14.35 17.54 14.13 16.16 4 7.81 8.88 9.22 11.27 9.00 10.47 5 5.21 5.95 6.15 7.52 5.97 7.02 6 3.47 3.98 4.10 5.01 3.97 4.69 7 2.23 2.56 2.64 3.22 2.55 3.02 8 1.30 1.49 1.54 1.88 1.48 1.77 9 0.58 0.67 0.68 0.84 0.66 0.79 10 0.00 0.00 0.00 0.00 0.00 0.00 figure 3. external trim resistor setup to increase output. figure 4. external trim resistor setup to decrease output.
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 10 of 18 october 4, 2002 - revision a1 basic operation and features (continued) output enable the alq15 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 option is 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. on the other hand, the negative enable version turns 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 will shut down the entire converter if any of the two output voltages exceeds the ovp threshold limits. it will remain latched (shut down) until the ovp fault condition is removed and the input voltage is recycled. over current protection (ocp) the over current protection circuit will shutdown the converter if any of the load current of either output reaches the ocp threshold limits. the unit will automatically recover once the over current condition is removed. see figure 12 for typical output characteristic under an over current condition. over temperature protection (otp) the over temperature protection circuit will shutdown the converter once the sensed location 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.
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 11 of 18 october 4, 2002 - revision a1 performance curves 3.3v / 2.5v (fg series) figure 7. efficiency at v in = 48v vs. balanced load current (i o1 = i o2 ) at various ambient temperatures and with 100lfm airflow (total power = 60w) figure 8. load regulation vs. ambient temperature at v in = 48v. 3v3/2v5 efficiency (i o1 = i o2) ) 60 65 70 75 80 85 90 1 2 3 4 5 6 7 8 9 10 output current on each channel [adc] efficiency [%] vin = 36v vin = 48v vin = 75v figure 5. efficiency for balanced output power (p o1 = p o2 ) at various input voltages (p o1 + p o2 = 60w). taken w/ module mounted vertically w/ 300lfm airflow from pin 3 to 1 at t a = 25 c. figure 6. efficiency vs. balanced output current (i o1 = i o2 ) at various input voltages (total power = 60w). load regulation vs. ambient temp 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -40 25 55 ambient temperature [ oc] regulation (%) 3.3v load regulation 2.5v load regulation 48v in efficiency vs. balanced load current 60 65 70 75 80 85 90 0 2 4 6 8 10 output current [a] efficiency [%] -40 oc 25 oc 55 oc 3v3/2v5 efficiency (p o1 = p o2 ) 60 65 70 75 80 85 90 5 10 15 20 25 30 35 40 45 50 55 60 output power(balanced load) efficiency [%] 36 48 75
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 12 of 18 october 4, 2002 - revision a1 performance curves (continued) 3.3v / 2.5v (fg series) figure 12. typical output current waveform under an over current condition. output current scale at 0.5a/ mv. figure 9. line regulation vs. ambient temperature. line regulation vs. ambient temp 0.000 0.010 0.020 0.030 0.040 0.050 -40 25 55 ambient temperature [oc] line regulation [%] 3.3v line regulation 2.5v line regulation figure 11. over current trip point vs. input voltage at 25 c ambient temperature with 100lfm airflow. figure 10. start-up characteristic of vo1 (ch1) and vo2 (ch2) at balanced load current ; v in = 48v. over current trip point 0 5 10 15 20 25 36 40 44 48 52 56 60 64 68 72 76 input voltage [vdc] output current [adc] 2.5v 3.3v
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 13 of 18 october 4, 2002 - revision a1 performance curves (continued) 3.3v / 2.5v (fg series) 2.5v/1v5 (gm series) 3v3/1v8 efficiency (p o1 = p o2 ) 60 65 70 75 80 85 90 5 10 15 20 25 30 35 40 45 50 55 60 output power (balanced load) efficiency [%] 36 48 75 figure 13. efficiency for balanced output power (p o1 = p o2 ) at various input voltages (p o1 + p o2 = 60w). taken w/ module mounted vertically w/ 300lfm airflow from pin 3 to 1 at t a = 25 c. 2v5/1v5 efficiency (p o1 = p o2 ) 60 65 70 75 80 85 90 5 10 15 20 25 30 35 40 45 50 55 60 output power(balanced load) efficiency [%] 36 48 75 additional curves to be provided on next release. additional curves to be provided on next release. figure 14. efficiency for balanced output power (p o1 = p o2 ) at various input voltages (p o1 + p o2 = 60w). taken w/ module mounted vertically w/ 300lfm airflow from pin 3 to 1 at t a = 25 c.
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 14 of 18 october 4, 2002 - revision a1 performance curves (continued) current vs. temperature curves output power vs. ambient temperature (3v3/2v5) 5 15 25 35 45 55 65 25 35 45 55 65 75 85 ambient temperature [oc] output power [w] 0 lfm 100 lfm 200 lfm 300 lfm 400 lfm 500 lfm output power vs. ambient temperature (3v3/1v8) 5 15 25 35 45 55 65 25 35 45 55 65 75 85 ambient temperature [oc] output power [w] 0 lfm 100 lfm 200 lfm 300 lfm 400 lfm 500 lfm output power vs. ambient temperature (2v5/1v5) 5 15 25 35 45 55 65 25 35 45 55 65 75 85 ambient temperature [oc] output power [w] 0 lfm 100 lfm 200 lfm 300 lfm 400 lfm 500 lfm figure 15. combined output power (balanced load: i o1 = i o2 ) vs. ambient temperature curves for alq15fg48 version taken at various airflow conditions (converter mounted vertically with airflow direction from pin? to pin ?; v in = 48v nominal). figure 16. combined output power (balanced load: i o1 = i o2 ) vs. ambient temperature curves for alq15fy48 version taken at various airflow conditions (converter mounted vertically with airflow direction from pin? to pin ?; v in = 48v nominal). figure 17. combined output power (balanced load: i o1 = i o2 ) vs. ambient temperature curves for alq15fy48 version taken at various airflow conditions (converter mounted vertically with airflow direction from pin? to pin ?; v in = 48v nominal).
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 15 of 18 october 4, 2002 - revision a1 young?s stability curves alq15 3.3 volt channel 100 1 . 10 3 1 . 10 4 1 . 10 5 1 . 10 3 0.01 0.1 1 impedance magnitude ohms 100 1 . 10 3 1 . 10 4 1 . 10 5 100 0 100 frequency hz phase angle deg alq15 2v5 volt channel 100 1 . 10 3 1 . 10 4 1 . 10 5 1 . 10 4 1 . 10 3 0.01 0.1 1 frequency hz impedance magnitude ohms 100 1 . 10 3 1 . 10 4 1 . 10 5 100 0 100 frequency hz phase deg _______ 15 _______ 30 _______ 45 _______ 60 _______ 75 _______90 figure 18. ysc plots of 3v3 and 2v5 output channels.
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 16 of 18 october 4, 2002 - revision a1 young?s stability curves (continued) alq15 1v8 volt channel 100 1 . 10 3 1 . 10 4 1 . 10 5 1 . 10 3 0.01 0.1 1 frequency hz impedance magnitude ohms 100 1 . 10 3 1 . 10 4 1 . 10 5 100 0 100 frequency hz pahse deg 100 1 . 10 3 1 . 10 4 1 . 10 5 1 . 10 3 0.01 0.1 1 frequency hz impedance magnitude ohms alq15 1v5 volt channel 100 1 . 10 3 1 . 10 4 1 . 10 5 100 0 100 frequency hz phase deg _______ 15 _______ 30 _______ 45 _______ 60 _______ 75 _______90 figure 19. ysc plots of 1v8 and 1v5 output channels.
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 17 of 18 october 4, 2002 - revision a1 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 - 0.544 [13.82] - in [ mm ] weight - tbd g [oz] pin assignment 1 +v in 5 rtn 2 enable 6 trim 3 -v in 7 +v out1 4 +v out2 note: pin diameters at ? = 0.04" [ 1.02 mm] nominal. figure 20. alq15 series mechanical outline ( inches [(mm ]).
technical reference notes alq15xx48x series (open frame dual output quarter brick) model: alq15 series sheet 18 of 18 october 4, 2002 - revision a1 mechanical specifications (continued) soldering considerations the alq15 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 voltage 1 output voltage 2 enable logic pin length option alq15 w x 48 y z f = 3.3v g = 2.5v ?blank? = positive ?blank? = 5mm (standard) f = 3.3v y = 1.8v "n" = negative ?-6? = 3.7mm g = 2.5v m = 1.5v a = 5.0v f = 3.3v table 2. part numbering information. please call 1-888-41-astec for further inquiries or visit us at www.astecpower.com

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