ap3902p-g1 BCD Semiconductor Manufacturing Limited, ap3902p-g1 Datasheet - Page 3

• Manufacturer Part Number: ap3902p-g1
• Description: Low Power Pwm Switch For Off-line Smps
• Manufacturer: BCD Semiconductor Manufacturing Limited

VCC
VS
Functional Block Diagram
Sep. 2008 Rev. 1.0
LOW POWER PWM SWITCH FOR OFF-LINE SMPS
3
2
(1.2 V)
V
REF
(1.2 V)
V
V
FB
REF
REF
+
Comparator
-
Discharge
Compensation
+
-
-
Comparator
Slope
+
-
PWM
Figure 3. Functional Block Diagram of AP3902
Bias
UVLO
Discharge
Logic
Start-up Current
Source
3
PWM Logic
Short Circuit
Protection
OSC
BCD Semiconductor Manufacturing Limited
Driver
Emitter
Transistor
OUT
NPN
Data Sheet
AP3902
5, 6
4
1
8
GND
C
B
VA