MB3881 View Datasheet(PDF) - Fujitsu

Part Name

Description

Manufacturer

MB3881

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

Fujitsu 

MB3881

4. Soft Start Operation

(1) Description

• When the CTL-1 to CTL-4 pins are driven high (“H” level)

The channel-8 output voltage is soft-started by the capacitor (C+IN8) connected to the +IN8 terminal (pin 6).

The capacitor (Cs) connected to the CS terminal (pin 32) starts being charged and the output voltages of channels

1 to 4 and channel 8 are soft-started by the error amplifier in proportion to the CS pin voltage.

Input

CTL-1 ( pin 28 )

CTL-2 ( pin 29 )

CTL-3 ( pin 30 )

CTL-4 ( pin 31 )

Output

2V

VB ( pin 36)

FB8 ( pin 4)

0.3 V

CH8 output voltage

VO8

VREF ( pin 24)

2.5 V

CS ( pin 32)

1.25 V

CH1 to CH4, CH7

output voltage

VO1 to VO4, VO7

CH5, CH6 output

voltage VO5, VO6

t

(1) (2)

(3) (4)

(1) to (4) : CH1 to CH4, CH7 soft start interval

(2) to (3) : CH8 soft start interval

19

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