FAN7680 Fairchild Semiconductor, FAN7680 Datasheet

FAN7680

Manufacturer Part Number

FAN7680

Description

PC Power Supply Outputs Monitoring IC

Manufacturer

Fairchild Semiconductor

Datasheet

1.FAN7680.pdf (16 pages)

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Features

• PC Power Supply Output Monitor Circuitry

• Few External Components

• Over Voltage Protection for 3.3V, 5V and 12V(Vcc)

• Under Voltage Protection for 3.3V, 5V and 12V(Vcc)

• 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

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.

FAN7680

PC Power Supply Outputs Monitoring IC

Outputs

Outputs with Delay Time

Inputs

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-SOP

8-DIP

www.fairchildsemi.com

Rev. 1.0.0

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