DESCRIPTION
SG6105A controller is designed for switching-mode power supplies 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, and protection features against over-voltage and over-power are implemented. It directly senses all the output rails for OVP without the need for external dividers. An innovative AC-signal sampling circuitry provides a sufficient power-down warning signal for PG.
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 regulators 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:
AT
NLX
SFX (micro-ATX)