FAN7687 Datasheet | Fairchild Semiconductor

.fairchildsemi. FAN7685/FAN7686/FAN7687 PC Power Supply Output Monitoring IC Features - - - - - - - - - - - - - PC Power Supply Outputs Supervisory Circuitry Few External ponents 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 plete 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 ponents and greatly reduces PCB board space for power supply. 14DIP Typical Application - PC Switching Mode Power Supply 14SOP Rev. 1.1.0 ©2004 Fairchild Semiconductor Corporation FAN7685/FAN7686/FAN7687 Internal Block Diagrams Vcc 13 Vcc REF. Start-up POR 3.6V Vref PSON clr Delay 2.3ms Oscillator Reset VS12 10 VS5 12 VS33...