KA3S0680RF - Fairchild Semiconductor
Description
www.
fairchildsemi.
com
KA3S0680RB/KA3S0680RFB
Fairchild Power Switch(FPS)
Features
• Wide operatimg frequency range up to (150kHz) • Pulse by pulse over current limiting • Over load protection • Over voltage protecton (Min.
23V) • Internal thermal shutdown function • Under voltage lockout • Internal high voltage sense FET • External sync terminal • 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.
controller IC features a trimmed 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, weight and at the same time increase & efficiency, productivity, and system reliability.
It has a basic platform well suited for cost effective C-TV power supply.
TO-3P-5L
TO-3PF-5L
1
1
1.
DRAIN 2.
GND 3.
VCC 4.
FB 5.
Sync
Internal Block Diagram
#3 VCC #5 Sync
#4 FB
32V
−
5V
+
6.
4V
2µA 1mA 2.
5R 9V 1R
+
5V
Internal
Vref
bias
Good logic
OSC
− +
S Q
R
L.
E.
B
0.
1V
7.
5V − +
Thermal S/D
S Q
R
25V − OVER VOLTAGE S/D
Power on reset
©2001 Fairchild Semiconductor Corporation
SFET
#1 DRAIN
#2 GND
Rev.
1.
0.
2
KA3S0680RB/KA3S0680RFB
Absolute Maximum Ratings
Characteristic Maximum Drain voltage (1) Drain Gate voltage (RGS=1MΩ) Gate source (GND) voltage Drain current pulsed (2) Single pulsed avalanche energy (3) Continuous drain current (TC=25°C) Continuous drain current (TC=100°C) Maximum supply voltage Input voltage range
Total power dissipation
Symbol VD,MAX VDGR
VGS IDM EAS ID ID VCC,MAX VFB PD (watt H/S) Derating
...
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