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It provides all the two 431 + PWM functions necessary to monitor and control the output of High Integration with Few External Components the power supply. Remote ON/OFF control, power-good circuitry, and protection features against over-voltage Over-Voltage Protection for 3.3V, 5V, and 12V and over-power are implemented. It directly senses all Under-Voltage Protection for 3.3V, 5V, and 12V the output rails for OVP without the need for external dividers. An innovative AC-signal sampling circuitry Under-Voltage Protection for -12V and/or -5V provides a sufficient power-down warning signal for PG. Over-Power and Short-Circuit Protection A built-in timer generates accurate timing for the control Power-Down Warning Circuitry circuit, including the PS-off delay. The cycle-by-cycle PWM switching prevents the power transformer from Power-Good Circuitry saturation and ensures the fastest response for the Delay Time for PSON and PG Signal short-circuit protection, which greatly reduces stress for power transistors. Two internal precision TL431 shunt Remote ON/OFF Function regulators provide stable reference voltage and a driver On-Chip Oscillator and Error Amplifier for 3.3V and 5V standby regulation. Two Shunt Regulators for 3.3V and 5V-Standby Utilizing minimum external components, the SG6105A includes the functions for push-pull and/or half-bridge Latching PWM for Cycle-by-Cycle Switching topology, decreasing production cost and PCB space, Push-Pull PWM Operation and Totem Pole Outputs and increasing the MTBF for power supply. Soft-Start and Maximum 93% Duty Cycle Applications Switching mode power supply for computers: AT NLX SFX (micro-ATX) Ordering Information Operating Part Temperature Package Packing Method Eco Status Number Range SG6105ADZ -40 to +105C RoHS 20-pin Dual In-Line Package (DIP) Tube SG6105ADY -40 to +105C Green 20-pin Dual In-Line Package (DIP) Tube For Fairchilds definition of Eco Status, please visit: