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 with 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)