MB3785 データシートの表示（PDF） - Fujitsu

部品番号

コンポーネント説明

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MB3785

Switching Regulator Controller (4 Channels plus High-Precision, High-Frequency Capabilities)

Fujitsu 

MB3785A

s BLOCK DIAGRAM

+IN1 (E) 7

−IN1 (E) 6

FB1 5

−IN1 (C) 8

DTC1 4

CH 1

Error Amp 1

+

−

+

VREF

+

Comparator 1

DTC

−

2V

−

Comparator 1

−

−

+

VREF

PWM comparator 1

OFF Current

Setting

2.5 V

+IN2 (E) 12

−IN2 (E) 11

FB2 10

−IN2 (C) 13

DTC2 9

CH 2

Error Amp 2

+

−

VREF

Comparator 2

+

−

+

−

DTC 2 V

Comparator 2

−

−

+

VREF

PWM comparator 2

OFF Current

Setting

2.5 V

+IN3 (E) 25

−IN3 (E) 26

FB3 27

−IN3 (C) 24

DTC3 28

CH 3

Error Amp 3

+

−

Comparator 3

+

0.6 V

−

PWM comparator 3

+

+

−

100 Ω

OFF Current

Setting

2.5 V

CH 4

Error Amp 4

+IN4 (E) 30

+

−IN4 (E) 31

−

FB4 32

−IN4 (C) 29

Comparator 4

+

0.6 V

−

DTC4 33

SCP

Comparator

−−−−+

2.1 V

SCP

23

1 µA

PWM comparator 4

+

+

−

100 Ω

OFF Current

Setting

2.5 V

−

−

DTC

+

Comparator 3

VREF

1.2 V

−1.9 V

−1.3 V

SR

SR Latch

Under Voltage

Lock-out

Protection Circuit

Triangular-Wave

Oscillator Circuit

Ref. Power Supply

Vol. Circuit & Channel

Circuit

Control

14

OSCIN

2.5 V

15 16 17

19

RT CT

VREF

42

GND

Ca1

1

48 Cb1

45 VCC2

46 OUT1

47

VE1

3

2 Ca2

Cb2

44 OUT2

43

VE2

34

33 Ca3

Cb3

40 OUT3

41

VE3

Ca4

36

37

Cb4

39 OUT4

38

VE4

21 CTL2

22 CTL3

18 VCC1

20 CTL1

OSCOUT

Ceramic Resonator

5

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