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)