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technical reference notes aeh25b48n-6cl series model: aeh25b48x-xcxl sheet 1 of 12 august 4, 2008 rev 03 aeh25b48x-xcxl isolated dc/dc converter module industry standard ? brick ? 36-75v input, 12v / 25a output the aeh25b48n-6cl is a second-generation 12v half brick capable of delivering 25a output current or 300w maximum output power. it comes with industry standard brick features like: on/off enable pin, differential remote sense pins, output trim pin; input uvlo, ocp, ovp, otp and operates from an input line voltage of 36 ? 75 vdc. environmental specifications ? operating temperature: -40c to +85c (ambient) ? storage temperature: -40c to +125c ? dmtbf: > 2.5 mhrs electrical parameters input input range 36-75 vdc input surge 100v / 100ms efficiency 94% (typ) control enable positive & negative logic options output regulation (line, load, temp) <2% ripple and noise 150mv p-p output voltage adjust range 10% of nominal output transient response 180mv typ output deviation 50% to 75% load transient 1a/10s slew rate 300 s recovery over voltage protection 115% nominal special features ? high efficiency ? -40c to 100c baseplate operating temp ? enable on/off ? low output ripple and noise ? high capacitive load limit ? remote sense compensation ? regulation to zero load ? fixed frequency switching (200khz) ? eu directive 2002/95/ec compliant for rohs safety ? ul, cul 60950 recognized ? en 60950 through tuv-ps
technical reference notes (aeh25b48n-6cl) model: aeh25b48x-xcxl sheet 2 of 12 august 4, 2008 rev 03 electrical specifications standard test condition on a single unit, unless otherwise specified. t a : 25c (ambient air) +v in : 48v 2% -v in : return pin for +v in enable: open (positive enable) +v out : connect to load -v out : connect to load (return) trim (v adj ): open +sense: connect to +v out -sense: connect to -v out input cap: 220uf absolute maximum ratings stresses in excess of the absolute maxi mum ratings can cause permanent damage to the device. functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of the specs. exposure to absolute maximum ratings for exte nded periods can adversely affect device reliability. parameter device symbol min typ max unit input voltage: continuous: transient (100ms) all all v i v i, trans 0 0 - - 75 100 vdc vdc operating ambient temperature all t suffix t c -40 0 - 85 55 oc storage temperature all t stg -55 - 125 oc operating humidity all - - - 85 % i/o isolation all - - - 1500 vdc output power all p o,max - - 300 w input specifications parameter device symbol min typ max unit operating input voltage all v in 36 48 75 v dc undervoltage lockout turn-on point turn-off point all all - - 34.0 32.5 34.8 33.5 35.5 34.5 v v maximum input current 1 (v in = 0 to v in,max : i o = i o,max ) all i in,max - - 11.0 a input reflected-ripple current 2 (5hz to 20mhz: 12uh source impedance: t a = 25 oc) all i i - - 15 ma pk-pk no load input power (v in = v in,nom t a = 25 oc) all - - - 7.5 w
technical reference notes (aeh25b48n-6cl) model: aeh25b48x-xcxl sheet 3 of 12 august 4, 2008 rev 03 electrical specifications (continued) output specifications parameter device symbol min typ max unit output voltage setpoint (v in = v in,min to v in,max at i o = i o,max ; t a = 25 oc ) all v o,set 11.80 12.00 12.20 vdc output regulation: line load (i o = i o,min to i o,max ) temp (-40 oc to 100oc) all all all - - - - - - 0.1 0.1 - 0.4 0.4 1.0 % % %vo output ripple and noise 3 (5 hz to 20 mhz) v in = 36v, 48v v in = 75v all - - - - 120 - 150 250 mv pk-pk mv pk-pk external load capacitance all t suffix - - - - - - 10,000 see note 8 f rated output current all io 0 - 25 a output current-limit inception 4 (latching) all io 26 - 32 a efficiency 5 (v i = v in,nom ; i o,max ; t a = 25 c) all - 92 92.7 - % switching frequency all - 160 185 210 khz output rise time (i o = i o,max ; enable to vo within 1%) all - 25 40 60 msec output voltage overshoot (i o = i o,max ; t a = 25 c) all - - 0 4 %vo dynamic response 6 : ( ? i o / ? t = 1a/10 s ; v i = v in,nom ; t a = 25 c) load change from i o = 50% to 75% of i o,max : peak deviation settling time (to v o,set tolerance) all - - - - 180 300 260 500 mv sec load change from i o = 50% to 25% of i o,max : peak deviation settling time (to v o,set tolerance) all - - - - 180 300 260 500 mv sec enable pin voltage : logic low logic high all all -0.7 2.95 - - 1.2 10 v v enable pin current : logic low logic high (i leakage at 10v) all all - - - - 1.0 50 ma a module output voltage @ logic hi module output voltage @ logic low aeh - - 0.2 v
technical reference notes (aeh25b48n-6cl) model: aeh25b48x-xcxl sheet 4 of 12 august 4, 2008 rev 03 electrical specifications (continued) output specifications parameter device symbol min typ max unit output voltage adjustment range 7 all - 90 - 110 %vo output overvoltage clamp 4 (latching) all v o,clamp 13.35 13.60 14.00 v note: 1. the power module is not internally fused. an input line fuse (e.g. 15a , 250v fast blow) is recommended. 2. refer to figure 1 for the input reflected ripple current test setup. 3. refer to figure 2 for the output ripple test setup. 4. ocp and ovp protection modes are latching. 5. refer to figure 5 for the efficiency curves. 6. refer to the output transient characteristics on figures 10. for 100% to 0% step load deviation ? a min of 660uf capacitor on the output is required to prevent the module into going ovp. 7. for output voltage adjustment setup, refer to figures 3 and 4. for vin < 39v, the output can only be trimmed up 5% and the minimum ovp clamp is reduced to 12.75v. 8. ?t? suffix is a custom module tuned to operate with around 5,760 uf of output capacitance (15pcs oscon 16svp330m caps and 3pcs oscon 16sp270m connected in parallel). safety agency / material rating / isolation device safety approval all ul/cul 60950-1 first edition en 60950 through tuv material flammability rating all ul94v-0 parameter device symbol min typical max unit input to output capacitance all - 2700 - pf input to output resistance all - 10 - mohms input to output insulation type all - basic - -
technical reference notes (aeh25b48n-6cl) model: aeh25b48x-xcxl sheet 5 of 12 august 4, 2008 rev 03 electrical specifications (continued) figure 1. input reflected -ripple test setup. figure 2. peak to peak output noise and rippl e test measurement setup. vo(+) vo(-) resistive load 10 uf 0.1 uf scope copper strip note: use a 0.1 f @50v x7r ceramic capacitor and a 10 f @ 25v tantalum capacitor. scope measurement should be made using a bnc socket . position the load between 51 mm and 76 mm (2 in. and 3 in.) from module. 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 curre nt with a simulated source inductance (l test ) of 12uh. capacitor c s offsets possible battery impedance. measur e current as shown above. on 12v unit, a minimum 220uf <0.1 ohm esr capacitor is require d across input terminals for proper operation (same as capacitor on battery side of ltest) cs 220 uf esr < 0.1 ohm
technical reference notes (aeh25b48n-6cl) model: aeh25b48x-xcxl sheet 6 of 12 august 4, 2008 rev 03 basic operation and features aeh converters were designed specifically to address applications where ultra high power density is required. these modules provide basic insulation a nd 1500v isolation with very high output current capability in an industry standard half size module. operating from 36 to 75v input, they have st andard features such as remote sense, trim, ovp, ocp and otp. aeh series devices will accept industry standard heat sinks to enhance thermal perfo rmance in applications with conductive cooling. remote sense connect the + sense and ? sense pins close to the load to allow the module to compensate for the voltage drop across conductors carrying high load current. if remote sense is not re quired (for example if the load is close to the module) the se nse pins should be connected to the corresponding output pins. maxi mum voltage drop compensation is 10% vout. it is important to avoid introducing lumped inductance or capacitance into the remote path. do not connect remote sense lines ?beyond? any external output filter stages used with the module. output overcurrent protection to provide protection in an out put overload or short circuit c ondition, the converter is equippe d with current limiting circuit ry and can endure fault conditions for an unlimited duration. at th e point of current-limit inception, the converter latches as default protection mode, causing the output current to be limited bot h in peak and duration. the ocp latch is reset either by cycling the input voltage or toggling the enable signal for 100ms. output overvoltage protection the output over voltage system consists of a separate control loop, independent of the primary feedback path. this control loop has a higher voltage set point than the main circuit. in a fault condition, the converter latches off as default protectio n mode which ensures that the output voltage does not exceed v o,clamp,max . the converter will operate back normally once the fault is removed and the input voltage is cycled or the enable signal is toggled for 100ms. enable function the aeh25 series comes with an enable pin (pin 2), which is primarily used to turn on/o ff the converter. both a positive (no part number suffix required) and a negative (suffix ?n ? required) enable logic options are being offered. 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 lo w or directly connected to -v in . the unit turns off when the en able pin is at logic high. over temperature protection the over temperature protection circu it will shutdown the converter once the av erage pcb temperature reaches the otp range (105oc to 120oc baseplate). this feature prevents th e unit from overheating and consequently going into thermal runaway, which may further damage the c onverter and the end system. such overheati ng may be an effect of operation outside the given power thermal derating conditions. restart is possible once the temperature of the sensed location drops below the otp range.
technical reference notes (aeh25b48n-6cl) model: aeh25b48x-xcxl sheet 7 of 12 august 4, 2008 rev 03 figure 3. radj_up setup to increase output voltage. figure 4. radj_down setup to decrease output voltage. basic operation and features (continued) trim function output voltage adjustment is accomplished by connecting an external resistor between the trim pin and either the +sense or ? sense pins. to adjust vo to a higher value , please refer to figure 3. an external resistor, radj_up should be connected between the trim pin and the +sense pin. from equation (1), radj_up resistor can be determined for the required output voltage increment. equation (1) where: radj_up - in k ? ? % - percent change in output voltage to adjust vo to a lower value , please refer to figure 4. an external resistor, radj_down should be connected between the trim pin and the -sense pin. from equation (2), radj_down resistor can be determined for the required output voltage change. equation (2) where: radj_down - in k ? ? % - percent change in output voltage radj_up vo 100 ? % + () 1.225 ? % ? 100 ? % ? 2 ? ? ? ? ? ? k ? ? radj_down 100 ? % 2 ? ? ? ? ? ? k ? ?
technical reference notes (aeh25b48n-6cl) model: aeh25b48x-xcxl sheet 8 of 12 august 4, 2008 rev 03 performance curves figure 5: efficiency curves at t a = 25 c. figure 6: derating curve with forced air (vin = 48 vdc) figure 7: output start-up characteristic at v in = 48 vdc; c o = 10,000 f; i o = i o,min, figure 8: output turn-off at v in = 48 vdc; c o = 10,000f; i o = i o,min figure 9: output ripple at v in = 48 vdc; i o = i o,max figure 10: output transient performance at 50% to 75% step load, v in = 48 vdc. efficiency vs. load current 75% 80% 85% 90% 95% 100% 0 5 10 15 20 25 load current [a] efficiency [%] vin = 36 v vin = 48 v vin = 75 v
technical reference notes (aeh25b48n-6cl) model: aeh25b48x-xcxl sheet 9 of 12 august 4, 2008 rev 03 input filter for fcc class b conducted noise a reference design for an input filter that can provide fcc class b conducted noise levels is shown below (see figure 11). two common mode connected inductors are used in the circu it along with balanced bypass capacitors to shunt common mode currents into the ground plane. shunting noise current back to the converter reduces the amount of energy reaching the input lisn for measurement. the application circuit shown has an earth ground (frame ground) connected to the converter output (-) terminal. such a configuration is common practice to accommoda te safety agency requireme nts. grounding an output te rminal results in much higher conducted emissions as measured at th e input lisn because a hard path for co mmon mode current back to the lisn is created by the frame ground. ?floating? loads generally result in much lower measured emissions. the electrical equivalent of a floating load, for emi measurement purposes, can be created by grounding the converter output (load) through a suitably sized inductor(s) while maintaini ng the necessary safety bonding. also shown is a sketch of a pcb layout used to achieve class b conducted noise levels (see figure 12). it is important to avoid extending the ground plane or any othe r conductors under the inductors (particul arly l2) because cap acitive coupling to that track or plane can effectivel y bypass the inductor and degrade high frequency performance of the filter. parts list circuit code description l1, l2 pulse engineering p0353 / 590uh c1, c3, c4, c5, c6, c11, c12 0.01uf / 2000v c2, c7, c9 100uf / 100v aluminum c13, c14 470pf / 100v ceramic c8, c10 2.2uf / 100v film figure 11: class b filter circuit c1 c2 c5 c6 c7 c8 c14 c13 c9 l1a l1b l2a l2b c10 c12 ++ + vin - vin converter + 48 vdc input - + c11 + vout - vout c4 c3
technical reference notes (aeh25b48n-6cl) model: aeh25b48x-xcxl sheet 10 of 12 august 4, 2008 rev 03 input filter for fcc class b conducted noise (continued) figure 12: recommended pcb layout for class b filter mechanical specifications parameter device symbol min typ max unit dimension all l - 2.40 [60.96] - in [mm] all w - 2.30 [58.42] - in [mm] all h - 0.50 [12.70] - in [mm] weight all - 90 [3.18] - g [oz] note: (1) nominal diameter for pins 5 & 9 = 0.08", remaining pins at 0.04" diameter. (2) recommended torque setting for baseplate mounting holes is between 6 to 8 kg.cm. - vin + vin c2 c1 c7 c5 c6 c12 c9 c10 c8 gnd plane gnd plane c o n v e r t e r 11 22 3 4 3 4 top view +48 vdc 48 v return l1 a / b l2 a / b c3 c4 c11 c13 c14
technical reference notes (aeh25b48n-6cl) model: aeh25b48x-xcxl sheet 11 of 12 august 4, 2008 rev 03 mechanical outline drawing figure 13. aeh - baseplate outline drawing. see note 2
technical reference notes (aeh25b48n-6cl) model: aeh25b48x-xcxl sheet 12 of 12 august 4, 2008 rev 03 table 1. part number coding scheme for ordering enable logic - pin length generation special rohs w - x y z l aeh25b48 n = negative logic - 5 = 4.6mm nom 6 = 3.7mm nom blank = 5mm nom (default) c = second gen. product blank = first gen. product t = tuned part for custom application l = for rohs 6 please call 1-888-41-astec for further inquiries or visit us at www.powerconversion.com

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