MB3877 데이터 시트보기 (PDF) - Fujitsu

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MB3877

DC/DC Converter IC for Charging

Fujitsu 

MB3875/3877

s BLOCK DIAGRAM

−INE1

11

OUTC1

10

+INC1

<Current Amp.1>

13

+

−INC1

12

× 25

−

+INE1

8

FB1

9

−INE2 6

OUTC2 4

+INC2

<Current Amp.2>

24

+

−INC2

1

× 25

−

+INE2

7

<Error

Amp.1>

VREF

−

+

<Error

Amp.2>

VREF

−

+

FB2

3

<PWM

Comp.>

+++−

<OUT>

Drive

VCC (O)

21

OUT

20

VCC

Bias voltage

block

VH

19

<VH>

(VCC − 5 V)

IN3

2

−INE3

16

R1

∗

R2

50 kΩ

FB3

15

<SOFT>

VREF

1 µA

CS

22

<Error

Amp.3>

VREF

−

+

+

VREF

(4.2 V)

<UVLO>

VCC

(VCC UVLO) 215 kΩ

35 kΩ

0.91 V

(0.77 V)

VREF

ULVO

2.5 V

1.5 V

<OSC>

(45 pF)

VCC

bias

<REF> <CTL>

17

5

23

RT VREF

GND

∗ :MB3875 100 kΩ

MB3877 150 kΩ

VCC

18

CTL

14

4

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