SG6108 データシートの表示（PDF） - Fairchild Semiconductor
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SG6108 Datasheet PDF : 16 Pages
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Power Supply Supervisor + PWM
Product Specification
SG6108
FEATURES
PC half-bridge (or 494) power supply supervisor +
PWM
Highly Integrated and Few external components
required
Over voltage protection 3.3V/5V/12V (two 12V)
Under voltage protection 3.3V/5V/12V (two 12V)
Under voltage protection for –12V and/or –5V
Over current protection 3.3V/5V/12V (two 12V)
Over power protection
Short circuit protection
Power-down warning circuitry
Power good circuitry
Delay time for PSON and PG signals
Remote ON/OFF function
On-Chip oscillator and Error amplifier
Latching PWM for cycle-by-cycle switching
Soft-start
Maximum 48% duty cycle
APPLICATIONS
Switching mode power supplies for computers such
as ATX, NLX, and SFX (micro-ATX).
DESCRIPTION
The SG6108 controller is designed for desktop PC
switching mode power supplies. It provides everything
necessary to monitor and control the output of the power
supply. Remote ON/OFF control, power good circuitry,
over-voltage protection, over-power protection, and
over-current protection are all included. The SG6108
directly senses all the output rails for over voltage
conditions without requiring external dividers. An
innovative AC-signal sampling circuit provides an
adequate power-down warning signal for PG. A built-in
timer generates accurate timing for the control circuit.
Cycle-by-cycle PWM switching protects the power
transformer from saturation and ensures a rapid response
for short-circuit protection. This greatly reduces the stress
on the power transistors. The SG6108 utilizes a minimum
number of external components while including all the
functions needed for push-pull and/or half-bridge
topologies. This decreases production costs and PCB
space while increasing the power supply’s MTBF.
TYPICAL APPLICATION
Main Transformer
5Vsb
Pok
Pson
Vdd
+
+
+
+
SG6108
UVAC IS12
IS5
Vcc
IS33
V33
V5
PG
V12
Pson
VS12B
OP1
NVP
RI
GND
IN
COMP
OP2
SS
OPP
+
12V
-12V
+
12V
+
5V
+
3.3V
-12V
-5V
5V
12V
© System General Corp.
Version 1.0.1 (IAO33.0048.B0)
-1-
www.sg.com.tw • www.fairchildsemi.com
September 26, 2007
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