MB3882 Datasheet, PDF (20/30 Pages) Fujitsu Component Limited. – 2-channel DC/DC Converter IC with Synchronous Rectifier

MB3882
s PROCESSING WITHOUT USING THE CS TERIMNALS
When the soft start function is not used, the CS1 terminal (pin 4) and CS2 terminal (pin 22) should be left open.
"Open"
4 CS1
CS2 21
"Open"
< 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 1) and a timing
resistor (RT) to the RT terminal (pin 2) .
Oscillator frequency
fosc (kHz) =:
893000
CT (pF) •RT (kΩ)
s OUTPUT VOLTAGE SETTING
VO
FB1
6
R1
5
−INE1
R2
4
CS1
Error
− ^Amp.
+
+
1.25 V
VO = ^{1.25 V}
R2
(R1 + R2)
< CH1, 2 >
20