MB3885 Datasheet, PDF (19/29 Pages) Fujitsu Component Limited. – 1-channel DC/DC Converter IC with Synchronous Rectifier

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