MB3885 Просмотр технического описания (PDF) - Fujitsu

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MB3885

1-channel DC/DC Converter IC with Synchronous Rectifier

Fujitsu 

MB3885

s PROCESSING WITHOUT USING THE CS TERMINALS

When the soft start function is not used, the CS terminal (pin 6) should be left open.

"Open"

CS

< Operation Without Soft Start Setting >

s OSCILLATOR FREQUENCY SETTING

The oscillator frequency can be set by connecting a timing capacitor (CT) to the CT terminal (pin 4) and a timing

resistor (RT) to the RT terminal (pin 5) .

Oscillator frequency

fosc (kHz) =:

893000

CT (pF) •RT (kΩ)

s OUTPUT VOLTAGE SETTING

VO

FB

7

R1

8

−INE

R2

6

CS

Error

− Amp.

+

+

1.25 V

VO = 1.25 V

R2

(R1 + R2)

19

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