ds04-27248-1e fujitsu semiconductor data sheet assp for power supply applications (secondary battery) dc/dc converter ic for charging li-ion battery mb39a125/126 description mb39a125/126 is a dc/dc converter ic for charging li-i on battery, which is suitable for down-conversion, and uses pulse width modulation (pwm) for controlling the out put voltage and current inde pendently. this ic integrates the build-in comparator for the voltage detection of the ac adapter, and selects the ac adapter or battery auto- matically for power supply to the system. provides a wide range of power supply voltage, low standb y current, and high efficiency, which makes them ideal as a built-in charging device in products such as notebook pc. features ? high efficiency : 97 % (max) built-in two constant current control circuits analog control of the charging current value ( + ine1, + ine2 terminal) built-in ac adapter voltage detection function (acok, xacok terminal) (continued) packages 24-pin plastic ssop 28-pin plastic qfn (fpt-24p-m03) (lcc-28p-m11) www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 2 (continued) ? external output voltage se tting resistor : mb39a125 built-in output voltage setting resistor : mb39A126 built-in charge stop function at low vcc output voltage setting accuracy : 0.74 % (ta = ? 10 c to + 85 c) : mb39a125 : 12.6 v/16.8 v 0.8 % (ta = ? 10 c to + 85 c) : mb39A126 built-in high accuracy current detection amplifier ( 5 % ) (at input voltage difference 100 mv) , ( 15 % ) (at input voltage difference 20 mv) in ic standby mode (icc = 0 a typ) , make output voltage setting resistor open to prevent inefficient current loss built-in soft-start circuit standby current : 0 a (typ) totem-pole type output for pch mos fet www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 3 pin assignments ? mb39a125 (continued) (top view) (fpt-24p-m03) ? inc2 1 24 + inc2 o utc2 2 23 gnd + ine2 3 22 cs ? ine2 4 21 vcc acok 5 20 out vref 6 19 vh acin 7 18 xaco k ? ine1 8 17 rt + ine1 9 16 ? ine3 o utc1 1 0 15 fb123 outd 11 14 ctl ? inc1 1 2 13 + inc1 www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 4 (continued) (top view) (lcc-28p-m11) note : connect ic?s radiation board at bottom side to potential of gnd. cs vcc out vh xaco k rt ? ine3 28 27 26 25 24 23 22 n.c. 1 21 fb12 3 gnd 2 20 ctl + inc2 3 19 + inc 1 n.c. 4 18 n.c. ? inc2 5 17 ? inc 1 o utc2 6 16 out d + ine2 715 n.c. 8 9 10 11 12 13 14 ? ine2 acok vref acin ? ine1 + ine1 o utc1 www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 5 ? mb39A126 (continued) (top view) (fpt-24p-m03) ? inc2 124 + inc2 o utc2 223 gnd + ine2 322 cs ? ine2 421 vcc acok 520 out vref 619 vh acin 718 xaco k ? ine1 817 rt + ine1 916 ? ine3 o utc1 10 15 fb123 sel 11 14 ctl ? inc1 12 13 + inc1 www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 6 (continued) (top view) (lcc-28p-m11) note : connect ic?s radiation board at bottom side to potential of gnd. cs vcc out vh xaco k rt ? ine3 28 27 26 25 24 23 22 n.c. 121 fb12 3 gnd 220 ctl + inc2 319 + inc 1 n.c. 418 n.c. ? inc2 517 ? inc 1 o utc2 616 sel + ine2 715 n.c. 8 9 10 11 12 13 14 ? ine2 acok vref acin ? ine1 + ine1 o utc1 www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 7 pin descriptions ? mb39a125 : ssop-24 pin no. pin name i/o description 1 ? inc2 i current detection amplifier (cu rrent amp2) inverted input terminal 2 outc2 o current detection amplifier (current amp2) output terminal 3 + ine2 i error amplifier (error amp2) non-inverted input terminal 4 ? ine2 i error amplifier (error amp2) inverted input terminal 5acoko ac adapter voltage detection bl ock (ac comp.) output terminal acok = l when acin = h, acok = hi-z when acin = l, acok = hi-z when ctl = l 6 vref o reference voltage output terminal 7 acin i ac adapter voltage detection block (ac comp.) input terminal 8 ? ine1 i error amplifier (error amp1) inverted input terminal 9 + ine1 i error amplifier (error amp1) non-inverted input terminal 10 outc1 o current detection amplifier (current amp1) output terminal 11 outd o when ic is standby mode, this terminal is set to ?hi-z? to prevent loss of inefficient current through t he output voltage setting resistor. set ctl terminal to ?h? level to output ?l? level. 12 ? inc1 i current detection amplifier (cu rrent amp1) inverted input terminal 13 + inc1 i current detection amplifier (current amp1) non-inverted input terminal 14 ctl i power supply control terminal setting the ctl terminal at ?l? le vel places the ic in the standby mode. 15 fb123 o error amplifier (error amp1, 2, 3) output terminal 16 ? ine3 i error amplifier (error amp3) inverted input terminal 17 rt ? triangular wave oscillation frequency setting resistor connection terminal 18 xacok o ac adapter voltage detection bloc k ( ac comp.) output terminal xacok = hi-z when acin = h, xacok = l when acin = l, xacok = hi-z when ctl = l 19 vh o power supply terminal for fet drive circuit (vh = vcc ? 6 v) 20 out o external fet gate drive terminal 21 vcc ? power supply terminal for reference vo ltage, control circuit, and output cir- cuit 22 cs ? soft-start setting capacitor connection terminal 23 gnd ? ground terminal 24 + inc2 i current detection amplifier (current amp2) non-inverted input terminal www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 8 ? mb39a125 : qfn-28 pin no. pin name i/o description 1n.c. ? no connection 2gnd ? ground terminal 3 + inc2 i current detection amplifier (current amp2) non-inverted input terminal 4n.c. ? no connection 5 ? inc2 i current detection amplifier (cu rrent amp2) inverted input terminal 6 outc2 o current detection amplifier (current amp2) output terminal 7 + ine2 i error amplifier (error amp2) non-inverted input terminal 8 ? ine2 i error amplifier (error amp2) inverted input terminal 9acoko ac adapter voltage detection bl ock (ac comp.) output terminal acok = l when acin = h, acok = hi-z when acin = l, acok = hi-z when ctl = l 10 vref o reference voltage output terminal 11 acin i ac adapter voltage detection block (ac comp.) input terminal 12 ? ine1 i error amplifier (error amp1) inverted input terminal 13 + ine1 i error amplifier (error amp1) non-inverted input terminal 14 outc1 o current detection amplifier (current amp1) output terminal 15 n.c. ? no connection 16 outd o when ic is standby mode, this terminal is set to ?hi-z? to prevent loss of inefficient current through t he output voltage setting resistor. set ctl terminal to ?h? level to output ?l? level. 17 ? inc1 i current detection amplifier (cu rrent amp1) inverted input terminal 18 n.c. ? no connection 19 + inc1 i current detection amplifier (cu rrent amp1) non-inverted input terminal 20 ctl i power supply control terminal setting the ctl terminal at ?l? le vel places the ic in the standby mode. 21 fb123 o error amplifier (error amp1, 2, 3) output terminal 22 ? ine3 i error amplifier (error amp3) inverted input terminal 23 rt ? triangular wave oscillation frequency setting resistor connection terminal 24 xacok o ac adapter voltage detection bloc k ( ac comp.) output terminal xacok = hi-z when acin = h, xacok = l when acin = l, xacok = hi-z when ctl = l 25 vh o power supply terminal for fet drive circuit (vh = vcc - 6 v) 26 out o external fet gate drive terminal 27 vcc ? power supply terminal for reference volt age, control circuit, and output cir- cuit 28 cs ? soft-start setting capacitor connection terminal www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 9 ? mb39A126 : ssop-24 pin no. pin name i/o description 1 ? inc2 i current detection amplifier (cu rrent amp2) inverted input terminal 2 outc2 o current detection amplifier (current amp2) output terminal 3 + ine2 i error amplifier (error amp2) non-inverted input terminal 4 ? ine2 i error amplifier (error amp2) inverted input terminal 5acoko ac adapter voltage detection bl ock (ac comp.) output terminal acok = l when acin = h, acok = hi-z when acin = l, acok = hi-z when ctl = l 6 vref o reference voltage output terminal 7 acin i ac adapter voltage detection block (ac comp.) input terminal 8 ? ine1 i error amplifier (error amp1) inverted input terminal 9 + ine1 i error amplifier (error amp1) non-inverted input terminal 10 outc1 o current detection amplifier (current amp1) output terminal 11 sel i charge voltage setting switch terminal (3cells or 4cells) sel terminal ?h? level : char ge voltage setting 16.8 v (4cells) sel terminal ?l? level : char ge voltage setting 12.6 v (3cells) 12 ? inc1 i current detection amplifier (cu rrent amp1) inverted input terminal 13 + inc1 i current detection amplifier (cu rrent amp1) non-inverted input terminal 14 ctl i power supply control terminal setting the ctl terminal at ?l? level places the ic in the standby mode. 15 fb123 o error amplifier (error amp1, 2, 3) output terminal 16 ? ine3 i error amplifier (error amp3) inverted input terminal 17 rt ? triangular wave oscillation frequency setting resistor connection terminal 18 xacok o ac adapter voltage detection bloc k ( ac comp.) output terminal xacok = hi-z when acin = h, xacok = l when acin = l, xacok = hi-z when ctl = l 19 vh o power supply terminal for fet drive circuit (vh = vcc - 6 v) 20 out o external fet gate drive terminal 21 vcc ? power supply terminal for reference volt age, control circuit, and output cir- cuit 22 cs ? soft-start setting capacitor connection terminal 23 gnd ? ground terminal 24 + inc2 i current detection amplifier (cu rrent amp2) non-inverted input terminal www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 10 ? mb39A126 : qfn-28 pin no. pin name i/o description 1n.c. ? no connection 2gnd ? ground terminal 3 + inc2 i current detection amplifier (cu rrent amp2) non-inverted input terminal 4n.c. ? no connection 5 ? inc2 i current detection amplifier (c urrent amp2) inverted input terminal 6 outc2 o current detection amplifie r (current amp2) output terminal 7 + ine2 i error amplifier (error amp2) non-inverted input terminal 8 ? ine2 i error amplifier (error amp2) inverted input terminal 9acoko ac adapter voltage detection bl ock (ac comp.) output terminal acok = l when acin = h, ac ok = hi-z when acin = l, acok = hi-z when ctl = l 10 vref o reference voltage output terminal 11 acin i ac adapter voltage detection block (ac comp.) input terminal 12 ? ine1 i error amplifier (error amp1) inverted input terminal 13 + ine1 i error amplifier (error amp1) non-inverted input terminal 14 outc1 o current detection amplifie r (current amp1) output terminal 15 n.c. ? no connection 16 sel i charge voltage setting switch te rminal (3cells or 4cells) . sel terminal ?h? level : char ge voltage setting 16.8 v (4cells) sel terminal ?l? level : charge voltage setting 12.6 v (3cells) 17 ? inc1 i current detection amplifier (c urrent amp1) inverted input terminal 18 n.c. ? no connection 19 + inc1 i current detection amplifier (cu rrent amp1) non-inverted input terminal 20 ctl i power supply control terminal setting the ctl terminal at ?l? le vel places the ic in the standby mode. 21 fb123 o error amplifier (error amp1, 2, 3) output terminal 22 ? ine3 i error amplifier (error amp3) inverted input terminal 23 rt ? triangular wave oscillation frequency setting resistor connection terminal 24 xacok o ac adapter voltage detection bl ock ( ac comp.) output terminal xacok = hi-z when acin = h, xacok = l when acin = l, xacok = hi-z when ctl = l 25 vh o power supply terminal for fet drive circuit (vh = vcc - 6 v) 26 out o external fet gate drive terminal 27 vcc ? power supply terminal for reference volt age, control circuit, and output cir- cuit 28 cs ? soft-start setting capacitor connection terminal www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 11 block diagrams ? mb39a125 21 20 19 14 23 6 17 22 11 16 15 3 1 24 2 4 9 12 13 10 8 7 5 18 ? ine1 (vcc ? 6 v) 4.2 v < soft> 500 k hz max [ vref 5.0 v 10 a c t (45 pf) 4.2 v bias vref uvlo drive bias voltage vh ? 2.5 v ? 1.5 v vref vref 1.4 v vcc o utc1 + inc1 ? inc1 + ine1 ? ine2 o utc2 + inc2 ? inc2 + ine2 fb123 ? ine3 outd cs rt vref gnd ct l vh ou t vc c acok acin 0.2 v ? inc1 (vo) xacok slope control ? + ? + ? + + ? + ? + ? + ? + ? 20 20 www.datasheet.co.kr datasheet pdf - http://www..net/
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mb39a125/126 12 ? mb39A126 ? ine1 4.2 v/3.15 v < soft> 500 k hz max [ vref 5.0 v 10 a c t (45 pf) 4.2 v bias vref uvlo drive bias voltage vh vref vref 1.4 v vcc outc1 + inc1 ? inc1 + ine1 ? ine2 outc2 + inc2 ? inc2 + ine2 fb123 ? ine3 sel cs rt vref gnd ct l vh ou t vc c acok acin 0.2 v ? inc1 (vo) xacok slope control ? + ? + ? + + ? + ? + ? + ? + ? 20 20 r1 r2 21 20 19 14 23 6 17 22 11 16 15 3 1 24 2 4 9 12 13 10 8 7 5 18 (vcc ? 6 v) ? 2.5 v ? 1.5 v h i : 4 cells l o : 3 cells www.datasheet.co.kr datasheet pdf - http://www..net/
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mb39a125/126 13 absolute maximum ratings *1 : when mounted on a 10cm square epoxy double-sided. *2 : the packages are mounted on the dual-sided epoxy board (10 cm 10 cm) . connect ic?s radiation board at bottom side to potential of gnd. warning: semiconductor devices can be permanently dam aged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. do not exceed these ratings. parameter symbol condition rating unit min max power supply voltage v cc vcc terminal ? 28 v output current i out ?? 60 ma peak output current i out duty 5 % (t = 1 / fosc duty) ? 700 ma power dissipation p d ta + 25 c (ssop-24) ? 740* 1 mw ta + 25 c (qfn-28) ? 3700* 2 mw storage temperature t stg ?? 55 + 125 c www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 14 recommended operation conditions note : the terminal number which has been described in the text is the on e of the ssop-24p package after this. warning: the recommended operating conditions are require d in order to ensure the normal operation of the semiconductor device. all of the device?s electric al characteristics are warranted when the device is operated within these ranges. always use semiconductor devices within their recommended operating cond ition ranges. operation outside these ranges may adversely affect re liability and could result in device failure. no warranty is made with respect to uses, operat ing conditions, or combinations not represented on the data sheet. users considering application outside the listed conditions are advised to contact their fujitsu representatives beforehand. parameter symbol condition value unit min typ max power supply voltage v cc vcc terminal 8 ? 25 v reference voltage output current i ref ?? 1 ? 0ma vh terminal output current i vh ? 0 ? 30 ma input voltage v ine + ine, ? ine terminal 0 ? 5v v inc + inc, ? inc terminal 0 ? v cc v ctl terminal input voltage v ctl ? 0 ? 25 v output current i out ?? 45 ? +45 ma peak output current i out duty 5 % (t = 1 / fosc duty) ? 600 ? +600 ma acin terminal input voltage v acin ? 0 ? v cc v acok terminal output voltage v acok ? 0 ? 25 v acok terminal output current i acok ? 0 ? 1ma xacok terminal output voltage v xacok ? 0 ? 25 v xacok terminal output current i xacok ? 0 ? 1ma outd terminal output voltage : mb39a125 v outd ? 0 ? 17 v outd terminal output current : mb39a125 i outd ? 0 ? 2ma sel terminal input voltage : mb39A126 v sel ? 0 ? 25 v oscillation frequency f osc ? 100 300 500 khz timing resistor r t ? 27 47 130 k ? soft-start capacitor c s ?? 0.22 1.0 f vh terminal capacitor c vh ?? 0.1 1.0 f reference voltage output capacitor c ref ?? 0.22 1.0 f operating ambient temperature ta ?? 30 + 25 + 85 c www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 15 electrical characteristics (vcc = 19 v, vref = 0 ma, ta = + 25 c) * : standard design value (continued) parameter sym- bol pin no. condition value unit remarks min typ max 1. reference voltage block [ref] output voltage v ref1 6ta = + 25 c 4.963 5.000 5.037 v mb39a125 v ref2 6ta = ? 10 c to + 85 c 4.95 5.000 5.05 v mb39a125 v ref1 6ta = + 25 c 4.943 4.980 5.017 v mb39A126 v ref2 6ta = ? 10 c to + 85 c 4.930 4.980 5.030 v mb39A126 input stability line 6 vcc = 8 v to 25 v ? 310mv load stability load 6 vref = 0 ma to ? 1 ma ? 110mv output current at short circuit ios 6 vref = 1 v ? 50 ? 25 ? 12 ma 2. under voltage lockout protection circuit block [uvlo] threshold voltage v tlh 6vref = 2.6 2.8 3.0 v v thl 6vref = 2.4 2.6 2.8 v hysteresis width v h 6 ?? 0.2* ? v 3. soft start block [soft] charge current i cs 22 ?? 14 ? 10 ? 6 a 4. triangular wave oscillator block [osc] oscillation frequency f osc 20 rt = 47 k ? 270 300 330 khz frequency temperature stability ? f/fdt 20 ta = ? 30 c to + 85 c ? 1* ?% 5-1. error amplifier block [error amp1, error amp2] input offset voltage v io 3, 4, 8, 9 fb123 = 2 v ? 15mv input bias current i b 3, 4, 8, 9 ?? 100 ? 30 ? na common mode input voltage range v cm 3, 4, 8, 9 ? 0 ? 5v voltage gain av 15 dc ? 100* ? db frequency bandwidth bw 15 av = 0 db ? 1.3* ? mhz output voltage v fbh 15 ? 4.8 5.0 ? v v fbl 15 ?? 0.8 0.9 v output source current i source 15 fb123 = 2 v ?? 120 ? 60 a output sink current i sink 15 fb123 = 2 v 2.0 4.0 ? ma www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 16 (vcc = 19 v, vref = 0 ma, ta = + 25 c) * : standard design value (continued) parameter sym- bol pin no. condition value unit remarks min typ max 5-2. error amplifier block [error amp3] input current i ine 16 ? ine3 = 0 v ? 100 ? 30 ? na mb39a125 voltage gain av 15 dc ? 100* ? db frequency bandwidth bw 15 av = 0 db ? 1.3* ? mhz output voltage v fbh 15 ? 4.8 5.0 ? v v fbl 15 ?? 0.8 0.9 v output source current i source 15 fb123 = 2 v ?? 120 ? 60 a output sink current i sink 15 fb123 = 2 v 2.0 4.0 ? ma threshold voltage v th1 16 fb123 = 2 v, ta = + 25 c 4.179 4.200 4.220 v mb39a125 v th2 16 fb123 = 2 v, ta = ? 10 c to + 85 c 4.169 4.200 4.231 v mb39a125 v th3 12 sel = 5 v, fb123 = 2 v, ta = + 25 c 16.700 16.800 16.900 v mb39A126 v th4 12 sel = 5 v, fb123 = 2 v, ta = ? 10 c to + 85 c 16.666 16.800 16.934 v mb39A126 v th5 12 sel = 0 v, fb123 = 2 v, ta = + 25 c 12.525 12.600 12.675 v mb39A126 v th6 12 sel = 0 v, fb123 = 2 v, ta = ? 10 c to + 85 c 12.500 12.600 12.700 v mb39A126 outd terminal output leak current i leak 11 outd = 17 v ? 01 a mb39a125 outd terminal output on resistance r on 11 outd = 1 ma ? 35 50 ? mb39a125 input current i in 12 ? inc1 = 16.8 v ? 84 150 a mb39A126 input resistance r1 12, 16 ? 105 150 195 k ? mb39A126 r2 16 ? 35 50 65 k ? mb39A126 www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 17 (vcc = 19 v, vref = 0 ma, ta = + 25 c) (continued) parameter sym- bol pin no. condition value unit remarks min typ max 5-2. error amplifier block [error amp3] sel input voltage v on 11 error amp3 reference voltage = 4.2 v (4-cell setting) 2 ? 25 v mb39A126 v off 11 error amp3 reference voltage = 3.15 v (3-cell setting) 0 ? 0.8 v mb39A126 input current i selh 11 sel = 5 v ? 50 100 a mb39A126 i sell 11 sel = 0 v ? 01 a mb39A126 6. current detection amplifier b l o c k [current amp1, current amp2] input offset voltage v io 1, 12, 13, 24 + inc1 = + inc2 = ? inc1 = ? inc2 = 3 v to vcc ? 3 ? +3 mv input current i + inch 13, 24 + inc1 = + inc2 = 3 v to vcc, ? v in = ? 100 mv ? 20 30 a i- inch 1, 12 + inc1 = + inc2 = 3 v to vcc, ? v in = ? 100 mv ? 0.1 0.2 a mb39a125 1 + inc1 = + inc2 = 3 v to vcc, ? v in = ? 100 mv ? 0.1 0.2 a mb39A126 i + incl 13, 24 + inc1 = + inc2 = 0 v, ? v in = ? 100 mv ? 180 ? 120 ? a i- incl 1, 12 + inc1 = + inc2 = 0 v, ? v in = ? 100 mv ? 195 ? 130 ? a current detection voltage v outc1 2, 10 + inc1 = + inc2 = 3 v to vcc, ? v in = ? 100 mv 1.9 2.0 2.1 v v outc2 2, 10 + inc1 = + inc2 = 3 v to vcc, ? v in = ? 20 mv 0.34 0.40 0.46 v v outc3 2, 10 + inc1 = + inc2 = 0 v, ? v in = ? 100 mv 1.8 2.0 2.2 v v outc4 2, 10 + inc1 = + inc2 = 0 v, ? v in = ? 20 mv 0.2 0.4 0.6 v common mode input voltage range v cm 1, 12, 13, 24 ? 0 ? v cc v voltage gain av 2, 10 + inc1 = + inc2 = 3 v to vcc, ? v in = ? 100 mv 19 20 21 v/v www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 18 (vcc = 19 v, vref = 0 ma, ta = + 25 c) * : standard design value (continued) parameter sym- bol pin no. condition value unit re- marks min typ max 6. current detection amplifier block [current amp1, current amp2] frequency bandwidth bw 2, 10 av = 0 db ? 2* ? mhz output voltage v outch 2, 10 ? 4.7 4.9 ? v v outcl 2, 10 ?? 20 200 mv output source cur- rent i source 2, 10 outc1 = outc2 = 2 v ?? 2 ? 1ma output sink current i sink 2, 10 outc1 = outc2 = 2 v 150 300 ? a 7. pwm comp. block [pwm comp.] threshold voltage v tl 15 duty cycle = 0 % 1.4 1.5 ? v v th 15 duty cycle = 100 %? 2.5 2.6 v 8. output block [out] output source cur- rent i source 20 out = 13 v, duty 5 % (t = 1 / fosc duty) ?? 400* ? ma output sink current i sink 20 out = 19 v, duty 5 % (t = 1 / fosc duty) ? 400* ? ma output on resistance r oh 20 out = ? 45 ma ? 6.5 9.8 ? r ol 20 out = 45 ma ? 5.0 7.5 ? rise time tr1 20 out = 3300 pf ? 50* ? ns fall time tf1 20 out = 3300 pf ? 50* ? ns 9. low input voltage detection block [uv comp.] threshold voltage v tlh 21 vcc = , ? inc1 = 16.8 v 17.2 17.4 17.6 v v thl 21 vcc = , ? inc1 = 16.8 v 16.8 17.0 17.2 v hysteresis width v h 21 ?? 0.4* ? v 10. ac adapter voltage detection block [ac comp.] threshold voltage v tlh 7 acin = 1.3 1.4 1.5 v v thl 7 acin = 1.2 1.3 1.4 v hysteresis width v h 7 ?? 0.1* ? v www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 19 (continued) (vcc = 19 v, vref = 0 ma, ta = + 25 c) * : standard design value parameter sym- bol pin no. condition value unit re- marks min typ max 10. ac adapter voltage detection block [ac comp.] acok terminal output leak current i leak 5acok = 25 v ? 01 a acok terminal output on resistance r on 5acok = 1 ma ? 200 400 ? xacok terminal output leak current i leak 18 xacok = 25 v ? 01 a xacok terminal output on resistance r on 18 xacok = 1 ma ? 200 400 ? 11. power supply control block [ctl] ctl input voltage v on 14 ic operation mode 2 ? 25 v v off 14 ic standby mode 0 ? 0.8 v input current i ctlh 14 ctl = 5 v ? 100 150 a i ctll 14 ctl = 0 v ? 01 a 12. bias voltage block [vh] output voltage v h 19 vcc = 8 v to 25 v, vh = 0 ma to 30 ma v cc ? 6.5 v cc ? 6.0 v cc ? 5.5 v 13. general standby current i ccs 21 ctl = 0 v ? 010 a power supply current i cc 21 ctl = 5 v ? 57.5ma www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 20 typical characteristics (continued) 6 5 4 3 2 1 0 0 5 10 15 20 2 5 ta = + 25 c ctl = 5 v 0 100 200 300 400 500 600 700 800 900 1 000 0 5 10 15 20 25 0 1 2 3 4 5 6 7 8 9 1 0 ta = + 25 c vcc = 19 v vref = 0 ma v ref i ctl 6 5 4 3 2 1 0 0 5 10 15 20 2 5 ta = + 25 c ctl = 5 v vref = 0 ma 0 1 2 3 4 5 6 0 5 10 15 20 25 30 3 5 ta = + 25 c vcc = 19 v ctl = 5 v 4 .92 4 .94 4 .96 4 .98 5 .00 5 .02 5 .04 5 .06 5 .08 ? 40 ? 20 0 20 40 60 80 10 0 vcc = 19 v ctl = 5 v vref = 0 ma 2 60 2 70 2 80 2 90 3 00 3 10 3 20 3 30 3 40 0 5 10 15 20 2 5 ta = + 25 c ctl = 5 v rt = 47 k ? power supply current vs. power supply voltage power supply voltage v cc (v) power supply current icc (ma) ctl terminal input current, reference voltage vs. ctl terminal input voltage ctl terminal input voltage v ctl (v) ctl terminal input current i ctl ( a) reference voltage v ref (v) reference voltage vs. power supply voltage power supply voltage v cc (v) reference voltage v ref (v) reference voltage vs. load current load current i ref (ma) reference voltage v ref (v) reference voltage vs. operating ambient temperature operating ambient temperature ta ( c) reference voltage v ref (v) triangular wave oscillation frequency vs. power supply voltage power supply voltage v cc (v) triangular wave oscillation frequency fosc (khz) www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 21 (continued) 2 60 2 70 2 80 2 90 3 00 3 10 3 20 3 30 3 40 ? 40 ? 20 0 20 40 60 80 10 0 vcc = 19 v ctl = 5 v rt = 47 k ? 10 100 1 000 10 100 100 0 ta = + 25 c vcc = 19 v ctl = 5 v ? 40 4 .12 4 .14 4 .16 4 .18 4 .20 4 .22 4 .24 4 .26 4 .28 ? 20 0 20 40 60 80 10 0 vcc = 19 v ctl = 5 v vref = 0 ma 1 6.70 1 6.75 1 6.80 1 6.85 1 6.90 ? 40 ? 20 0 20 40 60 80 10 0 vcc = 19 v ctl = 5 v sel = 5 v 1 2.50 1 2.55 1 2.60 1 2.65 1 2.70 ? 40 ? 20 0 20 40 60 80 10 0 vcc = 19 v ctl = 5 v sel = 0 v triangular wave oscillation frequency vs. operating ambient temperature operating ambient temperature ta ( c) triangular wave oscillation frequency fosc (khz) triangular wave oscillation frequency vs. timing resistor timing resistor r t (k ? ) triangular wave oscillation frequency fosc (khz) error amplifier threshold voltage vs. operating ambient temperature operating ambient temperature ta ( c) error amplifier threshold voltage v th (v) 39A126> error amplifier threshold voltage vs. operating ambient temperature operating ambient temperature ta ( c) error amplifier threshold voltage v th (v) error amplifier threshold voltage vs. operating ambient temperature operating ambient temperature ta ( c) error amplifier threshold voltage v th (v) www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 22 (continued) ? + vcc = 19 v 100 1k 10k 100k 1m 10m ? 180 ? 90 0 90 180 40 30 20 10 ? 10 ? 20 ? 30 ? 40 0 av ta = + 25 c vcc = 19 v error amp1 (error amp2) in ou t 1 f + 10 k ? 10 k ? 10 k ? 10 k ? 2.4 k ? 240 k ? 4.2 v (4) (3) 8 9 15 fb123 ? ine1, 2 + ine1, 2 ? + ? 180 ? 90 0 90 180 40 30 20 10 ? 10 ? 20 ? 30 ? 40 0 10 k ? 10 k ? 100 1k 10k 100k 1m 10m av in ou t 1 f + 2.4 k ? 240 k ? 4.2 v error amp3 16 15 ta = + 25 c vcc = 19 v fb123 ? ine3 + ? 40 30 20 10 ? 10 ? 20 ? 30 ? 40 0 ? 180 ? 90 0 90 180 100 1k 10k 100k 1m 10m av current amp1 12.6 v 12.55 v ou t vcc = 19 v + inc ? inc outc (24) (1) (2) (current amp2) 20 13 12 10 error amplifier, gain, phase vs. frequency frequency f (hz) gain av (db) phase (deg) error amplifier, gain, phase vs. frequency frequency f (hz) gain av (db) phase (deg) current detection amplifier, gain, phase vs. frequency frequency f (hz) gain av (db) phase (deg) www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 23 (continued) 0 1 00 2 00 3 00 4 00 5 00 6 00 7 00 8 00 ? 40 ? 20 0 20 40 60 80 10 0 7 40 0 500 1 000 1 500 2 000 2 500 3 000 3 500 4 000 ? 40 ? 200 2040608010 0 3 700 power dissipation vs. operating ambient temperature (ssop) operating ambient temperature ta ( c) power dissipation p d (mw) power dissipation vs. operating ambient temperature (qfn) operating ambient temperature ta ( c) power dissipation p d (mw) www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 24 functional description 1. dc/dc converter block (1) reference voltage block (ref) the reference voltage circuit uses the voltage supplied from the vcc terminal (pin 21) to generate a temperature compensated, stable voltage (5.0 v typ) used as the refe rence power supply voltage for the ic?s internal circuitry. this block can also be used to obtain a load current to a maximum of 1 ma from the reference voltage vref terminal (pin 6) . (2) triangular wave oscillator block (osc) the triangular wave oscillator block has built-in capac itor for frequency setting into and generates the triangular wave oscillation waveform by connecting the frequency se tting resistor with the rt terminal (pin 17) . the triangular wave is input to th e pwm comparator circuits on the ic. (3) error amplifier block (error amp1) this amplifier detects the output signal from the current detection amplifier (current amp1) , compares this to the + ine1 terminal (pin 9) , and outputs a pwm control signal to be used in c ontrolling the charge current. in addition, an arbitrary loop gain can be set up by co nnecting a feedback resistor and capacitor between the fb123 terminal (pin 15) and ? ine1 terminal (pin 8) , providing st able phase compensation to the system. (4) error amplifier block (error amp2) this amplifier detects the output signal from the current detection amplifier (current amp2) , compares this to the + ine2 terminal (pin 3) , and outputs a pwm control signal to be used in c ontrolling the charge current. in addition, an arbitrary loop gain can be set up by co nnecting a feedback resistor and capacitor between the fb123 terminal (pin 15) and ? ine2 terminal (pin 4) , providing st able phase compensation to the system. (5) error amplifier block (error amp3) this error amplifier (error amp3) detects the output vo ltage from the dc/dc converter and outputs the pwm control signal. mb39a125 can set the desired level of output voltage from 1 cell to 4 cells by connecting external output voltage setting resistors to the error amplifier in verted input terminal. mb39A126 can set the output voltage for 3 cells or 4 cells by sel terminal (pin 11) input. in addition, an arbitrary loop gain can be set by connecting a feedback resistor and capacitor from the fb123 terminal (pin 15) to the ? ine3 terminal (pin 16) , enabling stab le phase compensation to the system. (6) current detection amplifier block (current amp1) the current detection amplifier (current amp1) detects a voltage drop which occurs between both ends of the output sense resistor (rs2) due to the flow of the charge current, using the + inc1 terminal (pin 13) and ? inc1 terminal (pin 12) . the signal amplified to 20 ti mes is output to the outc1 terminal (pin 10) . www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 25 (7) current detection amplifier block (current amp2) the current detection amplifier (current amp2) detects a voltage drop which occurs between both ends of the output sense resistor (rs1) due to the flow of the ac adapter current, using the + inc2 terminal (pin 24) and ? inc2 terminal (pin 1) . the signal amplified to 20 times is output to the ou tc2 terminal (pin 2) . (8) pwm comparator block (pwm comp.) the pwm comparator circuit is a voltage-pulse width co nverter for controlling the output duty of the error amplifiers (error amp1 to error amp3) depending on their output voltage. the pwm comparator circuit compares the triangular wa ve voltage the lowest generated by the triangular wave oscillator to the error amplifier output voltage and turns on the external output transi stor, during the interval in which the triangular wave voltage is lowe r than the error amplifier output voltage. (9) output block (out) the output circuit uses a totem-pole configurati on capable of driving an external pch mos fet. the output ?l? level sets the output amplitude to 6 v (typ ) using the voltage generated by the bias voltage block (vh) . this results in increasing conversion efficiency and s uppressing the withstand volt age of the connected external transistor in a wide range of input voltages. (10) power supply control block (ctl) setting the ctl terminal (pin 14) low places the ic in the standby mode. (the power supply current is 10 a at maximum in the standby mode.) ctl function table : mb39a125 ctl function table : mb39A126 (11) bias voltage block (vh) the bias voltage circuit outputs v cc ? 6 v (typ) as the minimum potential of the output circuit. in the standby mode, this circuit outputs the potential equal to v cc . ctl power outd l off (standby) hi-z hon (active) l ctl power l off (standby) hon (active) www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 26 2. protection functions (1) under voltage lockout protection circuit block (uvlo) the transient state or a momentary decrease in power su pply voltage or internal reference voltage (vref) , which occurs when the power supply (vcc) is turned on, may cause malfunctions in the control ic, resulting in breakdown or deterioration of the system. to prevent such malfunction, the under voltage lockout protection circuit detects internal reference voltage drop and fixes the out terminal (pin 20) to the ?h? level. the system restores voltage supply when the internal reference voltage reaches the th reshold voltage of the under vo ltage lockout protection circuit. protection circuit (uvlo) operation function table : mb39a125 when uvlo is operating (vref voltage is lower than uvlo threshold voltage, the logic of the following terminal is fixed.) protection circuit (uvlo) operation function table : mb39A126 when uvlo is operating (vref voltage is lower than uvlo threshold voltage, the logic of the following terminal is fixed.) (2) low input voltage detection block (uv comp.) uv comp. detects that power supply voltage (vcc) is lower than the battery voltage + 0.2 v (typ) and fixes the out terminal (pin 20) to the ?h? level. the system restores voltage supply when the power su pply voltage reaches the threshold voltage of the ac adapter detection block. protection circuit (uv comp.) op eration function table : mb39a125 when uv comp. is operating (vcc voltage is lower than uv comp. threshold voltage, the logic of the following terminal is fixed.) protection circuit (uv comp.) op eration function table : mb39A126 when uv comp. is operating (vcc voltage is lower than uv comp. threshold voltage, the logic of the following terminal is fixed.) outd out cs acok xacok hi-zhlhl out cs acok xacok hlhl outd out cs lhl out cs hl www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 27 3. detection function (1) ac adapter voltage detection block (ac comp.) when acin terminal (pin 7) voltage is lower than 1.3 v (typ) , ac adapter voltage detection block (ac comp.) outputs ?hi-z? level to the acok terminal (pin 5) a nd outputs ?l? level to the xacok terminal (pin 18) . when ctl terminal (pin 14) is set to ?l? leve l, acok terminal (pin 5) and xacok terminal (pin 18) are fixed to ?hi-z? level. 4. switch function : mb39A126 the charge voltage can be set to 16.8 v/12.6 v with the sel terminal (pin 11) . sel function table acin acok xacok hlhi-z lhi-zl sel dc/dc output setting voltage h16.8 v l12.6 v www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 28 constant charging voltage and current operation mb39a125/126 is dc/dc converter with the pulse width modulation (pwm) . mb39a125 is in the output voltage control loop, the error amp3 compares internal voltage reference voltage 4.2 v and dc/dc converter output to output the pwm controlled signal. mb39A126 is in the output voltage control loop, the error amp3 compares internal voltage reference voltage 4.2 v/3.15 v and dc/dc converter out put to output the pwm controlled signal. in the charging current control loop, the voltage drop generated at both ends of charging current sense resistor (rs2) is sensed by + inc1 terminal (pin 13) , ? inc1 terminal (pin 12) of curr ent amp1, and the signal is output to outc1 terminal (pin 10) , which is amplified by 20 times. error amp1 compares the outc1 terminal (pin 10) voltage, which is the output of current amp1, and + ine1 terminal (pin 9) to output the pwm control signal and regulates the charging current. in the ac adapter current control loop, the voltage dr op generated at both ends of ac adapter current sense resistor (rs1) is sensed by + inc2 terminal (pin 24) , ? inc2 terminal (pin 1) of current amp2, and the signal is output to outc2 terminal (pin 2) , which is amplified by 20 times. error amp2 compares outc2 terminal (pin 2) voltage, which is output of current amp2, and + ine2 terminal (pin 3) volt age and outputs pwm controlled signal, and it limits the charging current due to the ac adapter current not to exceed the setting value. the pwm comparator compares the triangular wave to the smallest terminal voltage among the error amp1, error amp2 and error amp3. and the triangular wave vo ltage generated by the triangular wave oscillator. when the triangular wave voltage is smaller than the error amplifier output voltage, the main side output transistor is turned on. www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 29 setting the charge voltage mb39a125 the charging voltage (dc/dc output voltage) can be set by connecting external output voltage setting resistors (r3, r4) to the ? ine3 terminal (pin 16) . be sure to select a resistor value that allows you to ignore the on- resistance (35 ? , 1 ma) of the internal fet connected to the outd terminal (pin 11) . battery charging voltage : vo vo (v) = (r3 + r4) / r4 4.2 (v) ? + b outd ? ine3 vo r 3 r 4 4.2 v 11 16 www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 30 mb39A126 the setting of the charge voltage is switched to 3cells or 4cells by the sel terminal (pin 11) . charge voltage is set to 16.8 v when sel terminal is ?h? level, and charge voltage is set to 12.6 v when sel terminal is ?l? level. battery charging voltage : vo vo (v) = (150 k ? + 50 k ? ) / 50 k ? 4.2 (v) = 16.8 (v) (sel = h) vo (v) = (150 k ? + 50 k ? ) / 50 k ? 3.15 (v) = 12.6 (v) (sel = l) ? + s el ? inc1 r3 r4 4.2 v 3.15 v 150 k ? 50 k ? ? ine3 11 16 12 www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 31 setting the charge current the charge current value can be set at the analog voltage value of the + ine1 terminal (pin 9) . charge current formula : ichg (a) = v +ine1 (v) / (20 r s1 ( ? ) ) charge current setting voltage : v +ine1 (v) = 20 ichg (a) r s1 ( ? ) setting the input current the input limit current value can be se t at the analog voltage value of the + ine2 terminal (pin 3) . input current formula : i in (a) = v +ine2 (v) / (20 r s2 ( ? ) ) input current setting voltage : v +ine2 (v) = 20 i in (a) r s2 ( ? ) setting the triangular wave oscillation frequency the triangular wave oscillation frequency can be set by the timing resistor (r t ) connected to the rt terminal (pin 17) . triangular wave oscillation frequency fosc fosc (khz) : = 14100 / r t (k ? ) www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 32 setting the soft-start time soft-start function prevents rush current at start-up of ic when the soft-start capacitor (cs) is connected to the cs terminal (pin 22) . this ic charges ex ternal soft-start capacitor (cs) with 10 a after ctl terminal (pin 14) voltage level becomes high and ic starts (when v cc uvlo threshold voltage) . output on duty depends on pwm comp arator, which compares the fb123 te rminal (pin 15) voltage with the triangular wave oscillator output voltage. during soft start, fb123 terminal (pin 15) voltage increases with sum volt age of cs terminal and diode voltage. therefore, the output voltage of the dc/dc converte r and current increase can be set by output on duty in proportion to rise of cs terminal (pin 22) voltage. the on duty is affected by the ramp voltage of fb123 terminal (pin 15) until an output voltage of one error amp r eaches the dc/dc converter loop controlled voltage. soft-start time is obtained from the following formula : soft-start time : ts (time to output on duty 80 % ) ts (s) : = 0.13 cs ( f) ct cs 0 v 0 v 0 v 0 a i o v o o ut c t c s fb12 3 out vo io error amp3 threshold voltage f b123 soft - start timing chart www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 33 transient response at load-step the constant voltage control loop a nd the constant current control loop are independent. with the load-step, these two control loops change. the battery voltage and current overshoot are generated by the delay time of the control loop when the mode changes. the delay time is determined by phase compensation constant. wh en the battery is removed if the charge control is switched from the constant current c ontrol to the constant volta ge control, and the charging voltage does overshoot by generating t he period controlled with high duty by output setting voltage. the excessive voltage is not applied to the battery because the battery is not connected. when the battery is connected if the char ge control is switched from the cons tant voltage control to the constant current control, and the charging cu rrent does overshoot by generating the period controlled with high duty by charge current setting. the battery pack manufacturer in japan thinks it is not the problem the current ov ershoot of 10 ms or less. 10 ms constant current battery voltage error amp3 output error amp1 output e rror amp3 output constant current constant voltage error amp1 output battery current when charge co ntrol switches from the constant current control to the constant voltage control, the voltage does overshoot by gener- ating the period controlled with high duty by output setting voltage. the battery pack manufac- turer in japan thinks it is not the problem the current overshoot of 10 ms or less. timing chart at load - step www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 34 ac adapter detection function when acin terminal (pin 7) voltage is lower than 1.3 v (typ) , ac adapter voltage detection block (ac comp.) outputs ?hi-z? level to the acok terminal (pin 5) and outputs ?l? level to the xaco k terminal (pin 18) . when ctl terminal (pin 14) is set to ?l? leve l, acok terminal (pin 5) and xacok terminal (pin 18) are fixed to ?hi-z? level. (1) ac adapter presence if you connect as shown in the figure below the pres ence of ac adapter can be ea sily detected because the signal is output from the acok terminal (pin 5) to microc omputer etc. in this case, if the ctl terminal is set to ?l? level, ic becomes the standby state (i cc = 0 a typ). + ? micon acin acok xacok a c adapter 7 518 connection example of detect ing ac adapter presence www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 35 (2) automatic changing system power supply between ac adapter and battery the ac adapter voltage is detected and external switch at input side and battery side can be changed automat- ically with the connection as follows. connect ctl terminal (pin 14) to vcc terminal (pin 21) for this function. off duty cycle becomes 100 % when cs terminal (pin 22) voltage is made to be 0 v, if it is needed after full charge. + ? acin acok xacok syste m a c adapter batte ry vcc ctl cs vref 10 a micon < soft> 7 518 21 14 22 connection example of automati c changing system power supply between ac adapter and battery www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 36 (3) battery selector function when control signal from microcomputer etc. is input to ac in terminal (pin 7) as shown in the following diagram, acok terminal (pin 5) output voltage and xacok term inal (pin 18) output voltage are controlled to select one of the two batteries for charge. connec t ctl terminal (pin 14) to vcc termin al (pin 21) for this function. off duty cycle becomes 100 % when cs terminal (pin 22) voltage is made to be 0 v, if it is needed after full charge. + ? acin acok xacok system a c adapter battery1 vcc ctl cs vref < soft> 10 a micon i chg rs1 ab battery 2 7 518 21 14 22 connection example of battery selector function www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 37 (4) when ac comp. is not used when ac comp. (acin (pin 7) , acok (pin 5) , and xa cok (pin 18) terminals) is not used as follows, connect the acin (pin 7) , acok (pin 5) , and xacok (pin 18) terminals to gnd terminal (pin 23) . and connect vcc terminal (pin 21) to system, as follows , to avoid the reverse current from the battery to the vcc terminal (pin 21) . + ? acin acok xacok system a c adapter batte ry vcc i chg rs1 ab 7 518 21 connection example when ac comp. is not used www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 38 phase compensation + ? ? + ? ? ? ? ? ? lo : inductance rl : equivalent series resistance of inductance co : capacity of condenser esr : equivalent series resistance of condenser ro : load resistance example circuit ? 90 ? 80 ? 70 ? 60 ? 50 ? 40 ? 30 ? 20 ? 10 0 10 20 30 40 50 60 70 80 90 1 10 100 1k 10k 100k 1m 10m ? 180 ? 160 ? 140 ? 120 ? 100 ? 80 ? 60 ? 40 ? 20 0 20 40 60 80 100 120 140 160 180 gain phase phase gain phase [deg] gain [db] frequency characteristic of power output lc filter (dc gain is included.) frequency [hz] (ro (ro 2 1 rl) esr ) co lo f1 (hz) = + + lo = 15 h co = 14.1 f ro = 4.2 ? rl = 30 m ? esr = 100 m ? cut-off frequency frequency characteristics of lc filter www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 39 notes : 1) please review the error amp frequency char acteristics, when lc filt er parameter is modified. 2) when the ceramic capacitor is used as smoothi ng capacitor co, phase margin is reduced because esr of the ceramic capacitor is extremely small as shown in ?frequency characteristics of lc filter which is using low esr?. therefore, change phase compensati on of error amp or create resist ance equivalent to esr using pattern. ? 90 ? 80 ? 70 ? 60 ? 50 ? 40 ? 30 ? 20 ? 10 0 10 20 30 40 50 60 70 80 90 ? 180 ? 160 ? 140 ? 120 ? 100 ? 80 ? 60 ? 40 ? 20 0 20 40 60 80 100 120 140 160 180 1 10 100 1k 10k 100k 1m total gain amp open loop gain total phase phase phase [deg] gain [db] gain c c rc f2(hz) = 2 1 total frequency characteristic frequency [hz] rc = 150 k ? cc = 3300 pf cut-off frequency frequency characteristics of error amp ? 90 ? 80 ? 70 ? 60 ? 50 ? 40 ? 30 ? 20 ? 10 0 10 20 30 40 50 60 70 80 90 ? 180 ? 160 ? 140 ? 120 ? 100 ? 80 ? 60 ? 40 ? 20 0 20 40 60 80 100 120 140 160 180 1 10 100 1k 10k 100k 1m phase gain total gain amp open loop gain total phase phase [deg] gain [db] total frequency characteristic frequency [hz] triangular wave frequency the overview of frequency characteristic for dc/dc converter can be obtained in combination between ?frequency characteristics of lc filter? and ?frequency characteristics of error amp ? as mentioned above. please note the following point in order to stabilize the frequency characteristics of dc/dc converter . cut-off frequency of dc/dc converter should be set to half or less of the triangular wave oscillator frequency. frequency characteristics of dc/dc converter www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 40 ? 90 ? 80 ? 70 ? 60 ? 50 ? 40 ? 30 ? 20 ? 10 0 10 20 30 40 50 60 70 80 90 1 10 100 1k 10k 100k 1m 10m ? 180 ? 160 ? 140 ? 120 ? 100 ? 80 ? 60 ? 40 ? 20 0 20 40 60 80 100 120 140 160 180 gain phase phase gain phase [deg] gain [db] frequency characteristic of power output lc filter (dc gain is included.) frequency [hz] (ro (ro 2 1 rl) esr ) co lo f1 (hz) = + + board pattern or connected resistor ? + lo = 15 h co = 14.1 f ro = 4.2 ? rl = 30 m ? esr = 100 m ? cut-off frequency <3pole2zero> dc/dc output < additional esr> frequency characteristics of lc filter which is using low esr www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 41 processing without using of the current amp1 and amp2 when current amp is not used, connect the + inc1 terminal (pin 13) , + inc2 terminal (pin 24) , ? inc1 terminal (pin 12) , and ? inc2 terminal (pin 1) to vref terminal (pin 6) , and then leave outc1 terminal (pin 10) and outc2 terminal (pin 2) open. processing without using of the error amp1 and amp2 when error amp is not used, leave fb123 terminal (pin 15) open, connect the ? ine1 terminal (pin 8) and ? ine2 terminal (pin 4) to gnd, and connect + ine1 terminal (pin 9) and + ine2 terminal (pin 3) to vref terminal (pin 6) . 6 2 10 1 12 13 ? inc2 outc2 outc1 vref + inc1 24 + inc2 ? inc1 ?open? connection when current amp is not used 6 16 4 8 3 9 23 + ine2 ? ine2 ? ine1 vref gnd fb123 + ine1 ?open? connection when error amp is not used www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 42 processing without using of the cs terminal when soft-start function is not used, leave the cs terminal (pin 22) open. cs 22 ?open? connection when no soft - start time is specified www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 43 i/o equivalent circuit (continued) 1.235 v vcc ctl gnd vref gnd gnd gnd gnd fb123 vcc vcc cs cs 4.2 v rt ? ine1 + ine1 v ref ( 5.0 v) vref (5.0 v) vref (5.0 v) 37.8 k ? 33.1 k ? 51 k ? 12.35 k ? 14 6 + ? + ? 23 21 22 17 9 8 gnd gnd fb123 outc1 vcc vcc ? ine2 ? inc1 + inc1 + ine2 3 4 gnd vcc 16 15 10 12 13 gnd outc 2 fb12 3 vcc ? inc2 + inc2 2 1 24 ? ? esd protection element ? ? ? ? ? ? ? esd protection element www.datasheet.co.kr datasheet pdf - http://www..net/
mb39a125/126 44 (continued) vcc v cc vcc fb123 ct gnd g nd v cc vh outd sel g nd gnd gnd acin acok xacok gnd vh 20 7 v ref ( 5.0 v ) 5 18 19 11 11 33.1 k ? 51 k ? out ? ? |
