MB3782_1 Datasheet, PDF (4/27 Pages) Fujitsu Component Limited. – ASSP Power Supplies BIPOLAR Switching Regulator Controller

MB3782
s BLOCK DIAGRAM
RT
CT
3
2
1.25 V
VREF
1
2.5 V
VCC
CLT
20
19
Triangular wave
oscillator
+ IN1 4
– IN1 5
FB1 6
DTC1 7
– IN2 13
FB2 ¹²
DTC2 11
– IN3 18
FB3 17
DTC3 16
Error Amp.1
+
–
Error Amp.2
–
+
1.25 V
Error Amp.3
–
+
1.25 V
Reference
voltage
source
PWM Comp.
+
+
–
Power on/off
control
circuit
Ch.1
PWM Comp.
+
+
–
Ch.2
PWM Comp.
+
+
–
Ch.3
SCP Comp.
–
–
–
+
SCP ¹⁴
2.1 V
1 µA
VREF
S
R
Latch
U.V.L.O.
9 _GND
8 _OUT1
10 OUT2
15 OUT3
4