MB3886 Ver la hoja de datos (PDF) - Fujitsu

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fabricante

MB3886

2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type

Fujitsu 

MB3886

s BLOCK DIAGRAM

FB1 9

10 µA

−INE1 8

CS1 7

VREF

10 µA 3.8

kΩ

+INC1 10

CTL1 2

PSIG1 1

VCC

26

5 V Reg.

Error Amp.1

−

+

+

1.25 V

OVP Comp.1

+

−

Latch1-1

1.47 V CTL1 R

SQ

PWM Comp.1

+

−

< CH1 >

Drive1-1

Dead Time

Modulation1

CTL1

Latch2-1

Drive2-1

R Current

−

Q S Protection

Logic

+

16 VB

13 CB1

11 OUT1-1

12 VS1

14 OUT2-1

3 ILIM1

FB2 22

10 µA

−INE2 23

CS2 24

VREF

10 µA 3.8

kΩ

+INC2 21

CTL2 29

Error Amp.2

−

+

+

1.25 V

OVP Comp.2

+

−

Latch1-2

1.47 V CTL2 R

SQ

PSIG2 30

PWM Comp.2

+

−

< CH2 >

Drive1-2

Dead Time

Modulation2

CTL2

Latch2-2

Drive2-2

R Current

Protect-

−

Q S ion

Logic

+

18 CB2

20 OUT1-2

19 VS2

17 OUT2-2

15 PGND

28 ILIM2

CSCP 25

SCP Comp.

−

10 µA

−

+

2.3 V

CTL1 and CTL2

SR

Latch

Latch3

UVLO

CT1 CT2

2.1 V

1.3 V

2.1 V

1.3 V

bias VCC

OSC

Ref

(3.5 V) Power

45

CT RT

27 6

VREF SGND

4

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