FSD1000 Datasheet, PDF (1/20 Pages) Fairchild Semiconductor – Combo Fairchild Power Switch (FPS)

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FSD1000
Combo Fairchild Power Switch (FPS^TM)
Features
• Current Mode Control for Main Power
• Voltage Mode Control for Auxiliary Power
• Synchronized switching of Main and Auxiliary Power
(70kHz)
• Internal Start-up Circuit
• Internal Soft Start for Auxiliary Power
• User Defined Soft Start for Main Power
• Pulse by Pulse Current Limiting
• Over Load Protection (Main : Latch Mode, Aux : Auto
Restart Mode)
• Internal Over Temperature Protection
• Vcc Under Voltage Lockout
• Line Under voltage/ Over Voltage Lockout
• Burst Mode Operation for auxiliary power to reduce the
Power Consumption in the Standby Mode
• Internal High Voltage SenseFET for auxiliary power
Application
• SMPS for PC power
• LCD TV Power Supply
Description
FSD1000 is a Fairchild Power Switch (FPS) that is specially
designed for SMPS of personal computer. This device is a
high voltage power SenseFET combined with two PWM
controllers in a single monolithic device; One is for main power
and the other is for auxiliary power. The PWM controllers
feature integrated oscillator, under voltage lockout,
optimized gate driver and temperature compensated precise
current sources for the loop compensation. This device also
includes various fault protection circuits such as line under/
over voltage lock out, over voltage protection, over load
protection and over temperature protection. Compared with
discrete MOSFET and PWM controller solution, FSD1000
can reduce total cost, component count, size and weight
simultaneously increasing efficiency, productivity and
system reliability
Typical Circuit
Main Output
V_STR
AC
IN
Output
LS2
Main
PWM
I_sense
LS1
S/S
V_FB.aux
Aux
PWM
V_FB.main
Drain
GND
I_LIM
Vcc
Main Off
Aux Output
Figure 1. Typical Application circuit
©2004 Fairchild Semiconductor Corporation
Rev.1.0.2