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KA5Q0740 Datasheet

  • KA5Q0740

  • Fairchild Power Switch(FPS)

  • 12頁

  • FAIRCHILD

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KA5Q0740RT
Features
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Fairchild Power Switch(FPS)
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) consists of a
high voltage power SenseFET and a current mode PWM IC.
The integrated PWM controller includes the fixed oscillator,
the under voltage lock out, the leading edge blanking, the
optimized gate turn-on/turn-off driver, the thermal shut down
protection, the over voltage protection, and the temperature
compensated precision current sources for loop compensation
and fault protection circuitry. Compared to a discrete
MOSFET and a controller or a RCC switching converter
solutions, a Fairchild Power Switch(FPS) can reduce the total
number of components, design size, and weight, so it will
improve efficiency, productivity, and system reliability. It has
a basic platform well suited for cost-effective design in a
quasi-resonant converter as a C-TV power supply.
TO-220F-5L
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
1. Drain 2. GND 3. V
CC
4. Feedback 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
SYNC
5
Normal Mode
4.6V/2.6V
VREF
+
-
OSC
R
Roff
f
Rof
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.1.0.4
漏2003 Fairchild Semiconductor Corporation

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