MB3769A
■ BLOCK DIAGRAM
Fig. 1 - MB3769A Block Diagram
Over Current Detection Comparator
-IN (C)
+IN (C)
15
16
-
S
R
Q
+
-
10
9
VH
+
+
+
+
+
1.85 V
PWM
Comparator
+
OUT
VREF
1.8 V
-
DTC
4
8
STB
VL
STB
FB
3
1
+IN (OP)
+
Error
Amp.
-IN (OP)
OVP
-
2
Over Voltage Detector
13
+
-
S
R
Q
Power
off
2.5 V
1.5 V to 3.5 V
C T
5
6
Triangle Wave
+
-
R T
Oscillator
(2.5 V)
8/10 V
STB
V CC
12
15.4 V
5.0 + 0.1 V
-
Reference
Regulator
V Z
11
7
14
VREF
+
30 kΩ
GND
3