KA5Q Datasheet, PDF (1/16 Pages) Fairchild Semiconductor – Fairchild Power Switch(FPS)

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KA5Q-SERIES
KA5Q0765RT/KA5Q12656RT/KA5Q1265RF/
KA5Q1565RF
Fairchild Power Switch(FPS)
Features
• 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 RCC 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
Internal Block Diagram
1
1
1. Drain 2. GND 3. VCC 4. FB 5. Sync
VCC DRAIN
31
SYNC 5
FEEDBACK 4
Burst Mode
3.5V/1.25V
Normal Mode
4.6V/2.6V
VREF
Ifb
+
-
32V +_-1%
-
11V on
+
12V off
-
+
+
OSC
-
-
2.5R
R
+
Internal
BIAS
VREF
S _QB
R
LEB
450ns
+
-
UVLO
15V/9V
Rn_Ro_on
Rof
fRoff
7.5V
Sync
12V
Idelay _1V
+
-
OLP
+
-
OVP
+
-
Power
on
Reset
S
Q
R
Offset
Delay
80ns
+
-
OCL
Rsense
1V
Q
S
R
Power on Reset
(VCC=6.5V)
Thermal
Shut Down
2 SOURCE
©2003 Fairchild Semiconductor Corporation
Rev.1.0.3