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technical reference notes (trn) aa10c series 36 vdc to 75 vdc inputs, 10 w _____________________________________________________________ astec power - andover 1 of 12 rev description date approved pr-a preliminary release 3/30/00 pr-b updated efficiency specs 2/12/01 technical reference notes (trn) aa10c series dc-dc converter astec power andover, ma
technical reference notes (trn) aa10c series 36 vdc to 75 vdc inputs, 10 w _____________________________________________________________ astec power - andover 2 of 12 electrical specifications absolute maximum ratings stresses in excess of the absolute maximum ratings can cause permanent damage to the device. these are absolute stress ratings only. functional operation of the device in not implied at these or any other conditions in excess of those given in the operational sections of the trn. exposure to absolute maximum ratings for extended periods can adversely affect device reliability. table 1. absolute maximum ratings parameter device symbol min typ max unit input voltage: continuous: transient (100ms) all all v i v i, trans 0 0 - - 80 100 vdc vdc operating case temperature all tc -40 - 115 oc storage temperature all tstg -55 - 125 oc operating humidity all - - - 95 % i/o isolation all - - - 1500 vdc input specifications table 2. input specifications parameter device symbol min typ max unit operating input voltage all v i 36 48 75 vdc maximum input current (v i = 0 to v i,max : io = io,max) 015s-x 020s-x 025s-x* 033s-x 050s-x 120s-x 150s-x i i,max i i,max i i,max i i,max i i,max i i,max i i,max - - - - - - - - - - - - - - 0.15 0.18 0.22 0.30 0.40 0.37 0.37 a a a a a a input reflected-ripple current ( 5hz to 20mhz: 12uh source impedance: t a = 25 oc.) see figure 12. all i i - - 10 map-p no load input power (v i = v i,nom ) all - - - 0.75 w maximum input capacitance all - - - 1.4 uf caution: this power module is not internally fused. an input line fuse must always be used. output specifications table 3. output specifications parameter device symbol min typ max unit output voltage setpoint (v i = v i,min to v i,max : io = io,max; t a = 25 oc ) 015s-x 020s-x 025s-x* 033s-x 050s-x 120s-x 150s-x vo,set vo,set vo,set vo,set vo,set vo,set vo,set 1.44 1.92 - 3.17 4.85 11.52 14.40 1.5 2.0 2.5 3.3 5.0 12.0 15.0 1.56 2.08 - 3.43 5.20 12.48 15.60 vdc vdc vdc vdc vdc vdc vdc * for a 2.5v output, use the 2v output model (020s-x) with an the output voltage adjustment option.
technical reference notes (trn) aa10c series 36 vdc to 75 vdc inputs, 10 w _____________________________________________________________ astec power - andover 3 of 12 output specifications (continued) table 3. output specifications (continued) parameter device symbol min typ max unit output regulation: line ( v i = v i,min to v i,max ) load( io = io,min to io,max) temperature ( tc = -40 oc to +105 oc) all 120s-x 150s-x all 120s-x 150s-x all 120s-x 150s-x - - - - - - - - - - - - - - - - - - - - - - - - 25 0.5 0.5 5 0.1 0.1 15 0.2 0.2 100 2 2 mv % % mv % % mv % vo % vo output ripple and noise (across 2 x 0.47 uf ceramic capacitors) see figure 13. peak-to-peak (5 hz to 20 mhz) rms all 120s-x 150s-x all 120s-x 150s-x - - - - - - - - - - - - 50 75 75 - - - 100 120 120 30 35 35 mvp-p mvp-p mvp-p mv rms mv rms mv rms external load capacitance all 120s-x 150s-x - - - - - - - - - 1000 200 200 uf uf uf output current 015s-x 020s-x 025s-x* 033s-x 050s-x 120s-x 150s-x io io io io io io io 0.20 0.20 0.20 0.15 0.10 0.08 0.06 - - - - - - - 2.0 2.0 2.0 2.42 2.0 0.83 0.67 a a a a a a a output current-limit inception ( vo = 90% vo,set) 015s-x 020s-x 025s-x* 033s-x 050s-x 120s-x 150s-x io io io io io io io - - - - - - - - - - - - - - 4 4 4 4 4 1.4 1.1 a a a a a a a output short-circuit current ( vo = 250mv) all - - - 190 % io ,max * for a 2.5v output, use the 2v output model (020s-x) with an the output voltage adjustment option.
technical reference notes (trn) aa10c series 36 vdc to 75 vdc inputs, 10 w _____________________________________________________________ astec power - andover 4 of 12 output specifications (continued) table 3. output specifications (continued) parameter device symbol min typ max unit efficiency ( v i = v i,nom ; io = io,max; t a = 25 oc ) 015s-x 020s-x 025s-x* 033s-x 050s-x 120s-x 150s-x io io io io io io io 64 67 67 73 77 77 77 66 70 70 76 81 81 81 - - - - - - - % % % % % % % switching frequency all - 405 450 495 khz dynamic response: ( d io/ d t = 1a/10us; v i = v i,nom ; t a = 25 oc ) load change from io = 50% to 75% of io, max: peak deviation settling time (to vo,nom) load change from io = 50% to 25% of io, max: peak deviation settling time (to vo,nom) all all - - - - - - - - 2 250 2 250 6 500 6 500 % vo usec % vo usec turn-on time ( io = io,max; vo within 1%) all - - 1 5 msec output voltage overshoot ( io = io,max; t a = 25 oc ) all - - - 5 % vo isolation specifications table 4. isolation specifications parameter device symbol min typ max unit isolation capacitance all - - 260 - pf isolation resistance all - - 1000 - mohm general specifications table 5. general specifications parameter device symbol min typ max unit calculated mtbf (io = io,max; t a = 25 oc ) all - - tbd - hours weight all - - - 18(0.63) g (oz.) * for a 2.5v output, use the 2v output model (020s-x) with an the output voltage adjustment option.
technical reference notes (trn) aa10c series 36 vdc to 75 vdc inputs, 10 w _____________________________________________________________ astec power - andover 5 of 12 feature specifications table 6. feature specifications parameter device symbol min typ max unit remote on/off signal interface: (v i = 0 to v i,max ; open collector or equivalent compatible; signal referenced to v i (-) terminal.) positive logic ?suffix ?-4? low logic ? module off high logic ? module on negative logic ?suffix ?-1? low logic ? module on high logic ? module off module specifications: on/off current ? logic low on/off voltage: logic low logic high (ion/off = 0) open collector switch specifications: leakage current ? logic high (von/off = 10v) output voltage ? logic low (ion/off = 1ma) all all all all all ion/off von/off von/off ion/off von/off - -0.7 - - - - - - - - 1.0 1.2 10 50 1.2 ma v v ua v output voltage adjustment suffix ?-9? voltage adjustment range all 020s-x - - 90 90 - - 110 125 % vo % vo output overvoltage clamp 015s-x 020s-x 025s-x* 033s-x 050s-x 120s-x 150s-x vo,clamp vo,clamp vo,clamp vo,clamp vo,clamp vo,clamp vo,clamp 1.8 3.0 3.0 3.9 5.9 13.5 16.8 - - - - - - - 2.1 3.5 3.5 5.7 7.0 16.0 20.0 v v v v v v v undervoltage lockout turn-on point turn-off point all all - - - 32 34.5 32.5 35 - v v * for a 2.5v output, use the 2v output model (020s-x) with an the output voltage adjustment option.
technical reference notes (trn) aa10c series 36 vdc to 75 vdc inputs, 10 w _____________________________________________________________ astec power - andover 6 of 12 characteristic curves figure 1. typical input current vs input voltage. figure 2. 015s efficiency vs load current. figure 3. 020s efficiency vs load current. figure 4. 033s efficiency vs load current. figure 5. 050s efficiency vs load current. figure 6. 120s efficiency vs load current. figure 7. 150s efficiency vs load current. aa10c-048l-050s input characteristics (worst case) tc = 25 c, iout = 2a 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 vin (volts) aa10c-048l-050s efficiency vs output current tc = tc,max 50.0% 55.0% 60.0% 65.0% 70.0% 75.0% 80.0% 85.0% 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 output current (amps) vin = 36 vdc vin = 48 vdc vin = 75 vdc AA10C-048L-033S efficiency vs output current tc = tc,max 50.0% 55.0% 60.0% 65.0% 70.0% 75.0% 80.0% 0.24 0.48 0.73 0.97 1.21 1.45 1.69 1.94 2.18 2.42 output current (amps) vin = 36 vdc vin = 48 vdc vin = 75 vdc
technical reference notes (trn) aa10c series 36 vdc to 75 vdc inputs, 10 w _____________________________________________________________ astec power - andover 7 of 12 characteristic curves (continued) figure 8. typical output voltage startup figure 9. typical output ripple vi = vi ,nom, io = io,max. vi = vi ,nom, io = io,max. normalized output voltage time (100 us/div) time (100 us/div) figure 10. typical dynamic response figure 11. typical dynamic response step load change from 50% to 75% io ,max step load change from 50% to 25% io,max test configurations note: measure input reflected-ripple current with a simulated source inductance ( ltest) of 12 uh. capacitor cs offsets possible battery impedance. measure current as shown above. figure 12. input reflected-ripple test 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
technical reference notes (trn) aa10c series 36 vdc to 75 vdc inputs, 10 w _____________________________________________________________ astec power - andover 8 of 12 note: use a 2 x 0.47 uf ceramic capacitors. 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. figure 13. peak-to-peak output noise measurement test setup. feature descriptions output overvoltage clamp the output overvoltage clamp consists of a separate control loop, independent of the primary control loop. this control loop has a higher voltage setpoint than the primary loop. in a fault condition the converter goes into ?hiccup mode?, and the output overvoltage clamp ensures that the output voltage does not exceed vo ,clamp,max . this secondary control loop provides a redundant voltage-control that reduces the risk of output overvoltage. output current protection to provide protection in an output overload or short circuit condition, the converter is equipped with current limiting circuitry and can endure the fault condition for an unlimited duration. at the point of current-limit inception, the converter goes into ?hiccup mode?, causing the output current to be limited both in peak and duration .the converter operates normally once the output current is brought back into its specified range. enable (optional) two enable option are available. positive logic enable, suffix ?4?, and negative logic enable, suffix ?1?. positive logic enable turns the converter on during a logic-high voltage on the enable pin, and off during a logic-low. negative logic enable turns the converter of during a logic-high and on during a logic-low. output voltage adjustment (optional) output voltage adjustment is accomplished by connecting an external resistor between the vadj pin and either the + vout or ? vout pins. with an external resistor between the vadj pin and + vout pin ( r adj-down ) the output voltage set point ( vo ,adj) decreases (see figure 14). the following equation determines the required external resistor value to obtain an adjusted output voltage: vo(+) vo(-) resistive load 0.47 uf 0.47uf scope copper strip
technical reference notes (trn) aa10c series 36 vdc to 75 vdc inputs, 10 w _____________________________________________________________ astec power - andover 9 of 12 feature descriptions (continued) where r adj-down is the resistance value and g, h, and l are defined in table 7. with an external resistor between the vadj pin and - vout pin ( r adj-up ) the output voltage set point ( vo ,adj) increases (see figure 15). the following equation determines the required external resistor value to obtain an adjusted output voltage: where r adj-up is the resistance value and g, h, k, and l are defined in table 7: table 7 output adjustment variables. model g h k l 015s 5110 2050 0.26 1.24 020s 5110 2050 0.76 1.24 033s 5110 2050 0.80 2.5 050s 5110 2050 2.5 2.5 120s 10,000 5110 9.5 2.5 150s 10,000 5110 12.5 2.5 figure 14 . circuit configuration to decrease output voltage. figure 15 . circuit configuration to increase output voltage. radj_down . . ( ) , vo adj l g ( ) , , vo nom vo adj h ohm +vin -vin +vout -vout vadj enable radj-down rload radj_up . . g l ( ) ( ) , vo adj l k h ohm +vin -vin +vout -vout vadj enable radj-up rload
technical reference notes (trn) aa10c series 36 vdc to 75 vdc inputs, 10 w _____________________________________________________________ astec power - andover 10 of 12 thermal considerations the power converter operates in a variety of thermal environments: however, sufficient cooling should be provided to help ensure reliable operation of the converter. heat-dissipating components are thermally coupled to the pcb. heat is removed by conduction, convection, and radiation to the surrounding environment. proper cooling can be verified by measuring the pcb temperature. see figure 23 for pcb temperature measurement location. heat transfer characteristics increasing airflow over the converter enhances the heat transfer via convection. figure 16 shows the maximum power that can be dissipated by the converter without exceeding the maximum case temperature versus local ambient temperature (t a ) for natural convection through 3.0 m/s (600 ft/min). systems in which these converters are used generate airflow rates of 0.25 m/s (50 ft/min) due to other heat dissipating components in the system. therefore, the natural convection condition represents airflow rates of approximately 0.25 m/s (50 ft/min). use of figure 16 is shown in the following example. example what is the minimum airflow required for an 050s operating at 48 v, an output current of 2.0 a, and maximum ambient temperature of 95 oc. solution: given: vi = 48 v, io = 3.0 a, t a = 95 oc. determine p d (figure 20): p d = 2.2 w. determine airflow (figure 16): v = 1.0 m/s (200 ft/min) figure 16. forced convection power derating aa10c series power derating curve 0 0.5 1 1.5 2 2.5 3 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 ambient temperature (oc) nat. conv. 1.0 m/s (200 ft/min) 2.0 m/s (400 ft/min) 3.0 m/s (600 ft/min)
technical reference notes (trn) aa10c series 36 vdc to 75 vdc inputs, 10 w _____________________________________________________________ astec power - andover 11 of 12 thermal considerations (continued) figure 17. 015s pwr . diss . vs load current. figure 18. 020s pwr . diss . vs load current. figure 19. 033s pwr . diss . vs load current. figure 20. 050s pwr . diss . vs load current. figure 21. 120s pwr . diss . vs load current. figure 22. 150s pwr . diss . vs load current. figure 23. pcb temperature measurement location aa10c-048l-050s power dissipation vs output current tc = tc,max 0.00 0.50 1.00 1.50 2.00 2.50 3.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 output current (amps) vin = 36 vdc vin =48 vdc vin = 75 vdc AA10C-048L-033S power dissipation vs output current tc = tc,max 0.00 0.50 1.00 1.50 2.00 2.50 3.00 0.24 0.48 0.73 0.97 1.21 1.45 1.69 1.94 2.18 2.42 output current (amps) vin = 36 vdc vin =48 vdc vin = 75 vdc rectifier inductor transformer fet measurement location
technical reference notes (trn) aa10c series 36 vdc to 75 vdc inputs, 10 w _____________________________________________________________ astec power - andover 12 of 12 outline drawing dimensions are in inches (millimeters) tolerances: x.xx +/- 0.02 in ( x.x +/- 0.5mm) x.xx +/- 010 in ( x.xx +/- 0.25mm) pin assignment 1. +vin 2. - vin 3. + output 4. trim 5. - output 6. enable (on/off) ordering information table 8 part numbers. input voltage output voltage output power part number 36 v ? 75 v 1.5 v 3 w aa10c-048l-015s 36 v ? 75 v 2.0 v 4 w aa10c-048l-020s 36 v ? 75 v 3.3 v 8 w AA10C-048L-033S 36 v ? 75 v 5.0 v 10 w aa10c-048l-050s 36 v ? 75 v 12.0 v 10 w aa10c-048l-120s 36 v ? 75 v 15.0v 10 w aa10c-048l-150s table 9 option codes. suffix option -1 negative logic enable -4 positive logic enable -6 3.7 mm pin length -8 2.8 mm pin length -9 output voltage adjustment

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