MB3883(1998) Ver la hoja de datos (PDF) - Fujitsu

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MB3883
(Rev.:1998)

6-ch DC/DC Converter IC with Synchronous Rectifier for Voltage Step-up and Step-down

Fujitsu 

MB3883

• Block diagram (Expansion 2/2)

FB5 7

−IN5 8

DTC5 6

Error

− Amp.5

+

+

1.25 VSCP

− Comp.5

+

+

1.0 V

PWM

Comp.

5-1

+

+

−

PWM

Comp.

VB1 5-2

+

−

CH5

Drive

5-1

45 OUT5-1

Drive

5-2

46 OUT5-2

FB6 3

−IN6

(VB : 2 V) Error

Amp.6

4

−

37.5 kΩ +

62.5 kΩ

1.26 V

C+IN6 5

SCP

Comp.6

+

−

0.9 V

(VB : 2 V)

63 kΩ

PWM

Comp.6

+

0.74 V

+

−

37 kΩ

Power

Comp.

+

−

0.9V

CH6

Drive

6

47 OUT6

48 RB6

CTL1, 2 21

CTL3 22

CTL4 23

CS CTL

Logic

1.8 V− CT1

1.1 V−

1.8 V− CT2

1.1 V−

0.8 V− CT

0.3 V−

CTL5 24

OSC

2V

15

27 25 26

CS

VB RT CT

UVLO

SCP

18

CSCP

SW

Drive

1 SWOUT

44 GND (O)

2 SWIN

19 VCC

Power

Ref ON/OFF

CTL

20 CTL H : ON (Power/CH6)

2.49 V

16 17

L : OFF (Standby mode)

VREF GND

(48 Pin)

8

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