MB3821 Datasheet, PDF (4/24 Pages) Fujitsu Component Limited. – 2-ch DC/DC Converter IC With Synchronous Rectifier

MB3821
s BLOCK DIAGRAM
1 µΑ 1 µΑ
13 VB
FB1 6
−IN1 5
CS1 4
Error Amp.
−
+
+
1.26 V
< CH1 >
PWM Comp.1
+
−
PWM Comp.2
(40 mV)
+
−
FB2 19
−IN2 20
CS2 21
Error Amp.
−
+
+
1.26 V
< CH2 >
SCP Comp. _−
−
+
1 µΑ
CSCP 22
2.1 V
bias
SR
Latch
PWM Comp.1
+
−
PWM Comp.2
(40 mV)
+
−
UVLO
OSC
Drive
Drive
10 CB1
23 VCC
8 OUT1−1
9 VS1
11 OUT2−1
15 CB2
Drive
17 OUT1−2
16 VS2
Drive
14 OUT2−2
12 GND (0)
1.9 V
1.3 V
bias
Ref Power
(2.5 V) ON/OFF
18 CTL
7
1
2
SEL CT RT
24
VREF
3
GND
4