FAN7687

www.fairchildsemi.com FAN7685/FAN7686/FAN7687 PC Power Supply Output Monitoring IC Features PC Power Supply Outputs Supervisory Circuitry Few External Components Over Voltage Protection for 3.3V, 5V and 12V Outputs Under Voltage Protection for 3.3V, 5V and 12V Outputs Over Current Protection for 3.3V, 5V and 12V Outputs Dual Over Current Portection for 12V Outputs(FAN7687) Fault Protection Output With Open Drain Output Open Drain Power Good Output 300ms Power Good Delay 38ms PSON On/Off Delay 73us Debounce 2.3ms PSON to FPO Turn Off Delay Latch Function Controlled by PSON Description The FAN7685/FAN7686/FAN7687 is a complete output supervisory circuitry intended for use in the secondary side of the switched mode power supply. It provides overvoltage protection (OVP), undervoltage protection(UVP), overcurrent protection (OCP), and power good signal generator to monitor and control the outputs of the switching power supply system. Remote on/off(PSON) control and some precision protection features are also implemented. It directly senses all the output rails for OVP, UVP, and OCP without external divider resistors. As for output control, power good output(PGO) and fault protection output(FPO) are included. The FAN7685/FAN7686/FAN7687 offers a simple and cost effective solution with minimum number of external components and greatly reduces PCB board space for power supply. 14DIP Typical Application PC Switching Mode Power Supply 1 14SOP 1 Rev. 1...