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Quasi Resonant Converter Controller
Internal Burst Mode Controller for Stand-by Mode
Pulse by Pulse Current Limiting
Over Current Latch Protection
Over Voltage Protection (Vsync: Min. 11V)
Internal Thermal Shutdown Function
Under Voltage Lockout
Internal High Voltage Sense FET
Auto-Restart Mode
Description
The Fairchild Power Switch(FPS) product family is specially
designed for an off-line SMPS with minimal external
components. The Fairchild Power Switch(FPS) consist of high
voltage power SenseFET and current mode PWM controller IC.
PWM controller features integrated fixed oscillator, under
voltage lock out, leading edge blanking, optimized gate turn-on/
turn-off driver, thermal shut down protection, over voltage
protection, temperature compensated precision current sources
for loop compensation and fault protection circuit. compared to
discrete MOSFET and controller or R
CC
switching converter
solution, a Fairchild Power Switch(FPS) can reduce total
component count, design size, and weight and at the same time
increase & efficiency, productivity, and system reliability. It has
a basic platform well suited for cost-effective design in quasi
resonant converter as C-TV power supply.
TO-220F-5L
TO-3PF-5L
1
1
1. Drain 2. GND 3. V
CC
4. FB 5. Sync
Internal Block Diagram
VCC
DRAIN
3
+
-
32V
+
-
1%
11V on
12V off
Burst Mode
3.5V/1.25V
Internal
BIAS
1
-
+
VREF
+
-
UVLO
15V/9V
-
+
S
Ro
Ron
n
QB
Rof
Roff
f
SYNC
5
Normal Mode
4.6V/2.6V
VREF
+
-
OSC
R
Ifb
LEB
450ns
FEEDBACK
4
2.5R
R
-
+
Idelay
1V
+
-
S
Q
Offset
+
7.5V
Delay
80ns
-
+
-
OLP
Power
on
Reset
OCL
Thermal
Shut Down
Power on Reset
(VCC=6.5V)
+
-
Rsense
1V
R
Q
S
R
Sync
12V
2
SOURCE
OVP
Rev.1.0.3
漏2003 Fairchild Semiconductor Corporation