KA5M0765RQC
Fairchild Power Switch(SPS)
www.fairchildsemi.com
Features
• Precision fixed operating frequency (70KHz)
• Low start-up current (Typ. 100µA)
• Pulse by pulse current limiting
• Over load protection
• Over current protection
• Over voltage protection (Min. 25V)
• Internal thermal shutdown function
• Under voltage lockout
• Internal high voltage sense FET
• Auto-restart mode
Description
The SPS product family is specially designed for an off-line
SMPS with minimal external components. The SPS consist of
high voltage power SenseFET and current mode PWM IC.
Included PWM controller features integrated fixed frequency
oscillator, under voltage lock-out, leading edge blanking, opti-
mized gate turn-on/turn-off driver, thermal shutdown protec-
tion, over voltage protection, and temperature compensated
precision current sources for loop compensation and fault pro-
tection circuitry. Compared to discrete MOSFET and PWM
controller or RCC solution, a SPS can reduce total component
count, design size, weight and at the same time increase effi-
ciency, productivity, and system reliability.
It has a basic platform well suited for cost-effective design in
either a flyback converter or a forward converter.
TO-220-5L
1
1. DRAIN 2. GND 3. VCC 4. FB 5. S/S
Internal Block Diagram
Vcc Drain
31
OVP
+
OVP - ou t
27V -
VCC VREF 15V/9V
5uA 1mA
Feedback 4
Soft Start 5
2.5R
+ 5V
7.5V
- OLP
TSD
(TJ=150℃)
OVP - ou t
( VC C =2 7V)
OCL
( VS= 1 .4 V)
R
UVL O
Vref
OSC
CLK
INTERNAL
BIA S
Good Logic
SQ
-
LEB R
+
VO F FSE T
VOLTAG E
LIMIT Sense
CIRCUIT
FET
14V
VS
Power-on Reset
/Auto-restart
S
Q
R
Sh utd o wn
L at ch
Rsen se
2 GND
※ LEB : Leading Edge Blanking
※ OCL : Over Current Limit
©2001 Fairchild Semiconductor Corporation
Rev.1.0.1
