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FAN7680M Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FAN7680M Datasheet(HTML) 1 Page - Fairchild Semiconductor |
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1 / 16 page  ©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.0 Features • PC Power Supply Output Monitor Circuitry • Few External Components • Over Voltage Protection for 3.3V, 5V and 12V(Vcc) Outputs • Under Voltage Protection for 3.3V, 5V and 12V(Vcc) Outputs with Delay Time • Fault Protection Output with Open Drain Output • Open Drain Power Good Output • 300ms Power Good Delay • 38ms PSON On/Off Debounce • 73us Debounce •2.3ms PSON to FPO Turn Off Delay • Latch Function Controlled by PSON and Protection Inputs Typical Application • PC Power Supply OVP The FAN7680 has OVP functions for +3.3V, +5V, +12V(Vcc) outputs. This block is made up of three compara- tors with two inputs and resistor dividers. One input of a comparator is connected to a reference voltage and another input is connected to a resistor divider. UVP The FAN7680 also has UVP functions for +3.3V, +5V, +12V(Vcc) outputs. This block is made up of three compara- tors with two inputs and resistor dividers. One input of a comparator is connected to a reference voltage and another input is connected to a resistor divider. PSON The remote on/off(PSON) section is for controlling the SMPS externally. When a high signal is applied to the PSON input, the FPO signal becomes a high state and all secondary outputs are grounded. The remote on/off signal is transferred with some on/off debounce time. Description The FAN7680 is a complete output supervisory circuitry intended for use in the secondary side of a switched mode power supply. It provides over voltage protection (OVP), under voltage protection (UVP), fault protection output (FPO), remote On/Off (PSON), latch, internal delay circuits and power good signal generator to monitor and control the output of the switching power supply system. As for output control, power good output(PGO) and fault protection out- put(FPO) are included. It directly senses all the output rails for OVP and UVP without external dividers. The FAN7680 offers a simple and cost effective solution with minimum number of external components and greatly reduces PCB board space for power supply. FPO The FPO(Fault Protection Output) is a signal which indicates the system fault condition according to protection signals. When a fault state is occured, the FPO signal becomes high and the PGO signal becomes low and the main power is to be turned off. Normal State; "Low" Fault State; "High" PGO The power good signal generator provides a signal according to output voltage conditions of a power supply for safe oper- ation of a secondary system. The power good output should be low state before the output voltage is out of regulation at turn-off of the input power switch. Normal State ; "High" Fault State ; "Low" 8-DIP 8-SOP 1 1 FAN7680 PC Power Supply Outputs Monitoring IC |
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Similar Description - FAN7680M |
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