beta dyne q25 25-30w dc/dc c onverter 210.45 low noise, 4 to 1 input range, single & dual models beta dyne inc ? www.beta-dyne.com q25 dc/dc converter ? q25_ds_reva.pdf ? page 1 of 9 typical block diagram key features ? effciency up to 87% ? low output noise ? six-sided shielding ? output synchronous rectifcation ? input-to-output isolation ? soft start ? external synchronization ? short circuit protection ? thermal protection ? industry standard pinout beta dyne is protected under various patents, including but not limited to u.s. patent numbers: 5,777,519; 6,188,276; 6,262,901; 6,452,818; 6,473,3171. functional description the q25 series is a 25-30w low noise isolated converter , consisting of 14 standard single & dual output models from 3.3v dc to 15 v dc and 4:1 input voltage range from 9v to 72v. output synchronous rectifcation followed by a very low dropout linear regulator made possible to achieve up to 87% effciency and less than 5mv output noise with external capacitors. standard features include input undervoltage protection , external synchroniza - tion and thermal protection. the converter is packaged in a 1 x 2 x .45 metal case with six-sided shielding. 1 2 3 4 q25s12/48 m ade in usa 9 8 7 6 5 bet a dyne http:///
beta dyne inc ? www.beta-dyne.com q25 dc/dc converter ? q25_ds_reva.pdf ? page 2 of 9 parameter condition / note min typ max unit voltage see model selection guide vdc output voltage accuracy 1 % output current see model selection guide a output voltage adjustment see figure 15 5 10 % ripple & noise for further reduction see figure 1 & figure 4 40 mv line regulation minimum v in to maximum v in .1 % load regulation nl to fl .1 % t emperature coeffcient @ fl .01 .02 %/c t ransient response t ime 50% fl to fl to 50% fl, see figure 11 & 13 100 s short circuit protection by input current limiting t urn on delay with soft start see figure 12 & 14 output overvoltage protection none (s ee a pp . n o te parameter condition / note min typ max unit effciency (at full power) see model selection guide % isolation voltage (1 min.), input to output all models 1500 vdc isolation resistance 10 9 w isolation capacitance 300 pf switching frequency (f c c) 200 khz external sync frequency (fe) see fgure 9 210 khz parameter condition / note min typ max unit input voltage range see model selection guide vdc input startup voltage 24 v in 8 9 vdc input startup voltage 48 v in 14 17 vdc overvoltage shutdown 24 v in 37 vdc overvoltage shutdown 48 v in 73 vdc input filter lc no load input current see model selection guide ma full load input current see model selection guide a input surge current (20s spike) 10 a short circuit current limit 120% of i in @ full load off state current 150 a remote on/off control supply on pin 1 open (open circuit voltage: 10v max.) supply off 0 0.6 vdc logic input reference logic compatability ttl open collector or cmos open drain general specifications output specifications electrical specifcations input specifications unless otherwise specifed, all parameters are given under typical ambient tem perature of +25c with an airfow rate = 400lfm. with the given power derating, the operating range is -40c to +125c. specifcations subject to change without notice. http:///
parameter condition / note min typ max unit operating temperature range (ambient) industrial, see note 2 -40 +71 c storage temperature range -55 +125 c maximum operating case temperature 1 110 c mtbf per mil-hnbk-217f (ground benign, +25c) 1.110 6 hours shielding connection - v in for 24 v in shielding connection + v in for 48 v in model selection guide beta dyne inc ? www.beta-dyne.com q25 dc/dc converter ? q25_ds_reva.pdf ? page 3 of 9 model number input output voltage (vdc) current (ma) voltage (vdc) current (ma) effciency full load (%) nominal range no load full load q25s3.3/24 24 9-36 52 1273 3.3 7580 82 q25s5/24 24 9-36 73 1240 5 5000 84 q25s12/24 24 9-36 92 1250 12 2080 84 q25s15/24 24 9-36 117 1251 15 1660 84 q25s3.3/48 48 18-72 33 627 3.3 7580 83 q25s5/48 48 18-72 32 607 5 5000 85 q25s12/48 48 18-72 44 605 12 2000 86 q25s15/48 48 18-72 52 600 15 1660 87 q25d5/24 24 9-36 25 1350 5 2500 77 q25d12/24 24 9-36 47 1276 12 1040 82 q25d15/24 24 9-36 50 1226 15 830 85 q25d5/48 48 18-72 16 660 5 2500 78 q25d12/48 48 18-72 97 628 12 1040 84 q25d15/48 48 18-72 41 620 15 830 84 1 when converter enters thermal protection on mode, its duty cycle is reduced momentarily and will resume after its internal temperature (pwm) drops down a few degrees (oc).the converters output behaves similar to hiccup short circuit mode. 2 contact factory for -55 to +85c operating temperature range. 3 the maximum input current at any given input range measured at minimum input voltage is given as 1.6*i nominal . nominal input current is the typical value measured at the input of the converter under full-load room temperature and nominal input voltage ( 24 and 48v in ). 4 adequate insulation is to be provided to the converters at the end usage as per applicable requirements. 5 temperature rise on the case of the converters is to be considered during the end usage as per applicable requirements. q25 / ordering guide insert x for -55c to +85c (optional) insert r for rohs (optional) input voltage power number of outputs ( s = single, d = dual) output voltage ____ _ __ __ _ _ contact factory for custom input and output voltage combinations environmental specifications http:///
beta dyne inc ? www.beta-dyne.com q25 dc/dc converter ? q25_ds_reva.pdf ? page 4 of 9 parameter condition / note min typ max unit dimensions (lwh) 2.001.000.450 in. (50.8025.4011.43mm) weight 1.3 oz. (37g) physical characteristics figure 1. typical connection diagram for q25s5/24. part list for figure 1: l1= 2.2h c3= 50f@100v electrolytic c4=50f@100v electrolytic c5= 10f ceramic capacitors c6,c7=22f@35v low esr tantalum figure 2: output ripple of q25s5/24 as shown in fgure1. figure 2: figure 3: figure 3: output ripple of q25s5/24 with another external cap of nippon chemi-con 180 f@16v on the output. the part number is 16ps180mh11. cmc*=typically not used,common mode capacitor cmc= .01f@vcmc vcmc >= than required isolation, voltage can be up to 1500v dc max. http:///
beta dyne inc ? www.beta-dyne.com q25 dc/dc converter ? q25_ds_reva.pdf ? page 5 of 9 part list for figure 4: l1= 2.2h c3= 50f@100v electrolytic c4=50f@100v electrolytic c5,c6=47f@20v low esr tantalum c7,c8=2.2f@25v ceramic capacitor figure 5: output ripple of q25d15/24 on +vout as shown in figure 4. figure 5: figure 6: figure 6: output ripple of q25d15/24 on +vout with another external cap of nippon chemi-con 180 f@16v on the +vout. the p art number is 16ps180mh11. figure 4. typical connection diagram for q25d15/24. cmc*= typically not used, common mode capacitor, cmc= .01f@vcmc vcmc >= required isolation, voltage can be up to 1500vdc max http:///
beta dyne inc ? www.beta-dyne.com q25 dc/dc converter ? q25_ds_reva.pdf ? page 6 of 9 ex ternal s ynchroni z ation the sync pin can be used to synchronize the internal os - cilllator to external clock. an open drain output is the recommended interface between the external clock to the q25 sync pin as shown in fgure 7. the clock pulse width must be greater than 15ns. the external clock frequency must be greater than the frequency of the q25. multiple q25 converters can be synchronized together simply by connecting the converters sync pins together as shown in fgure 8. care should be taken to ensure the ground potential differences between the converters are minimized. in this confguration all the converters will be synchronized to the highest frequeny device. the sync pin is a cmos buffer with pull-up current limited to 200micro amps. if the external device forces the sync pin low before the internal oscillator ramp completes its charging cycle, the ramp will reset and another cycle begins. if the sync pins of multiple q25 converters are connected together, the frst sync pin that pulls low will reset the oscillator ramp of all the other converters. all converters will operate in phase when synchronized using the sync feature. up to fve devices can be synchronized using this method. figure 9. sync from external clock figure 10. sync of multiple devices figure 7: output ripple of q25d15/24 on -vout as shown in figure 4. figure 8: output ripple of q25d15/24 on -vout with another external cap of nippon chemi-con 180 f@16v on the -vout. the p art number is 16ps180mh11. figure 8: figure 7: 2 sync q25 q25 2 sync 3 g n d 3 g n d 2n7002 http:///
beta dyne inc ? www.beta-dyne.com q25 dc/dc converter ? q25_ds_reva.pdf ? page 7 of 9 figure 12. output voltage delay and rise time at vin=24, iout=5a using on/off pin on the q25s5/24. figure 11. transient response at vin=24, iout changing from full load to half load on a q25s5/24. http:///
beta dyne inc ? www.beta-dyne.com q25 dc/dc converter ? q25_ds_reva.pdf ? page 8 of 9 figure 14. output voltage delay and rise time at vin=24, iout at full load using on/off pin on the q25d15/24. figure 13. transient response at vin=24, iout changing from full load to half load on a q25d15/24. http:///
beta dyne inc ? www.beta-dyne.com q25 dc/dc converter ? q25_ds_reva.pdf ? page 9 of 9 6 bottom view ?0.040 [1.02] (7pl) 0.10 [2.54] min case header .xxx .01(.254) to le r a n c e : . x x . 02 ( . 508) d i m e n s i o n a r e i n i n c h ( m m ) 5 7 8 9 4 3 2 1 0.200 [5.08] 0.400 [10.16] 0.600 [15.24] 0.800 [20.32] 1.000 [25.40] 0.100 [2.54] 1.900 [48.26] 2.000 [50.80] 0.100 [2.54] 0.300 [7.62] 0 . 500 [12.70] 0 . 700 [17.78] 0 . 900 [22.86] 0.450 [11.42] max 6 b ottom v i e w ?0.040 [1.02] (7pl) 0.10 [2.54] min case header . x x x . 01 ( . 254) tolerance: .xx .02(.508) d i m e n s i o n a r e i n i n c h ( m m ) 5 7 8 9 4 3 2 1 0.200 [5.08] 0 . 400 [ 10. 16] 0.600 [15.24] 0.800 [20.32] 1.000 [25.40] 0.100 [2.54] 1.900 [48.26] 2.000 [50.80] 0.100 [2.54] 0.300 [7.62] 0.500 [12.70] 0.700 [17.78] 0.900 [22.86] 0.450 [11.42] max mechanical specifications pin function single input 1 on/off 2 sync in 3 -v in 4 +v in output 5 v adj 6 +s 7 +v out 8 -v out 9 -s dual input 1 on/off 2 sync in 3 -v in 4 +v in output 5 v adj 6 no pin 7 +v out 8 common 9 -v out (vo-vref)r1*r2 vref(r1+r2) -vor1 rt vor1-vref(r1 + r2) rl= in k rh= vref(r1*r2) rt in k vo vref r2 r1 rtrim 3.3v 1.225 4.22k 2.49k 15k 5v 2.5 2.49k 2.49k 9.53k 12v 2.5 9.53k 2.49k 20k 15v 2.5 15k 3.01k 23.7k figure 15. single output adjustment equations. note: vo is the adjusted output voltage http:///
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