STC6105 Datasheet, PDF (1/10 Pages) Suntac Electronic Corp. – Power Supply Supervisor + Regulator + PWM

STC6105 Power Supply Supervisor + Regulator + PWM
Product Specification
FEATURES
„ 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)
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.
MARKING DIAGRAMS
PIN CONFIGURATION
20
STC6105
1
PSON 1
20
VCC
V33
2
19
RI
V5
3
18
SS
OPP
4
UVAC ⁵
17
IN
16
COMP
NVP
6
15
GND
V12
7
14
FB1
OP2
8
13
VREF1
OP1
9
12
VREF2
PG
10
11
FB2
-1-