Product Specification
STC6105
FEATURES
Power Supply Supervisor + Regulator + PWM
DESCRIPTION
STC6105
controller is designed for switching
mode power supply for desktop PCs. It provides all the
functions necessary to monitor and control the output of
the power supply. Remote ON/OFF control, power good
circuitry, some protection features against over-voltage
and over-power are implemented. It directly senses all the
output rails for OVP without the need of external dividers.
An innovated AC-signal sampling circuitry provides a
sufficient power-down warning signal for PG. A built-in
timer generates accuracy timing for control circuit
including the PS-off delay. The cycle-by-cycle PWM
switching prevents the power transformer from the
saturation and ensures the fastest response for the
short-circuit protection which greatly reduce the stress for
power transistors. Two internal precision TL431 shunt
regulators provide stable reference voltage and driver for
3.3V and 5V-standby regulation. Utilizing minimum
number of external components, the STC6105 includes
all of the functions for push-pull and/or half-bridge
topology, decreasing the production cost and PCB space,
and increasing the MTBF for power supply.
PC half-bridge (or 494) power supply supervisor +
two 431 + PWM
High integration & few external components
Over-voltage protection for 3.3V, 5V and 12V
Under-voltage protection for 3.3V, 5V and 12V
Under-voltage protection for –12V and/or –5V
Over-power and short-circuit protection
Power-down warning circuitry
Power good circuitry
Delay time for PSON and PG signal
Remote ON/OFF function
On-chip oscillator and error amplifier
Two shunt regulator for 3.3V and 5V-Standby
Latching PWM for cycle-by-cycle switching
Push-pull PWM operation and totem pole outputs
Soft-start and maximum 93% duty cycle
APPLICATIONS
Switching mode power supply for Computers, such
as:
ATX
NLX
SFX (micro-ATX)
MARKING DIAGRAMS
PIN CONFIGURATION
20
PSON
V33
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VCC
RI
SS
IN
COMP
GND
FB1
VREF1
VREF2
FB2
STC6105
1
V5
OPP
UVAC
NVP
V12
OP2
OP1
PG
-1-
SUNTAC [ SUNTAC ELECTRONIC CORP. ]
