FAN7680N Fairchild Semiconductor, FAN7680N Datasheet

FAN7680N

Manufacturer Part Number

FAN7680N

Description

IC SECONDARY SIDE MONITOR 8DIP

Manufacturer

Fairchild Semiconductor

Datasheet

1.FAN7680N.pdf (16 pages)

Specifications of FAN7680N

Applications

Secondary-Side Monitor

Voltage - Supply

4 V ~ 15 V

Current - Supply

1mA

Operating Temperature

-40°C ~ 85°C

Mounting Type

Through Hole

Package / Case

8-DIP (0.300", 7.62mm)

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Voltage - Input

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

FAN7680N

Manufacturer:

APT

Quantity:

120

Current page: 1 of 16
Download datasheet (235Kb)

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

Related parts for FAN7680N

FAN7680N Summary of contents

Page 1

... 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. ©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com Description The FAN7680 is a complete output supervisory circuitry intended for use in the secondary side of a switched mode power supply ...

Page 2

FAN7680 Internal Block Diagram Vcc Start- VS5 6 VS33 5 UVP L H PGI 1 PGI_O Vref Typical Applicatin Circuit 3.6V REF. Vref Oscillator POR CLK Reset UVP ...

Page 3

Pin Assignments Pin Definitions Pin Number Pin Name 1 PGI 2 GND 3 FPO 4 PSON 5 VS33 6 VS5 PGO PGI PGO 1 8 GND FPO VS5 3 6 PSON VS33 ...

Page 4

FAN7680 Absolute Maximum Ratings Parameter Supply Voltage Supply Current Input Voltage Output Voltage Operating Temperature Storage Temperature Power Dissipation Recommended Operating Conditions Characteristic Supply Voltage Input Voltage Output Voltage Output Sink Current Supply Voltage Rising Time 4 (Note2,3) Symbol V ...

Page 5

Electrical Characteristics (V = 5V, Ta=25°C, unless otherwise specified) CC Over Voltage Protection, Under Voltage Protection and FPO Characteristic Over Voltage Threshold Under Voltage Threshold Leakage Current( ) FPO Low Level Output Voltage(FPO) PGI and PGO Characteristic Input Threshold Voltage(PGI) ...

Page 6

FAN7680 Typical Characteristics 0.0 0.5 1.0 1.5 2.0 PSON (V) Figure 1. PSON Threshold Voltage 2.83 2.79 2.75 2.71 2.67 VS33 (V) Figure 3. +3.3V UVP ...

Page 7

Typical Characteristics 9.80 9.60 9.40 9.20 Vcc (V) Figure 7. +12V UVP Voltage 9.00 8.80 13.30 13.50 FAN7680 13.70 13.90 14.10 14.30 Vcc (V) Figure 8. ...

Page 8

FAN7680 Timing Chart 1) AC Input ON/OFF - Normal State VCC POR PSON FPO t b1 PGI OUT PGO 2) PSON ON/OFF - Normal State PSON t FPO d3 PGI OUT PGO - Vcc : Supply Voltage - POR : ...

Page 9

Under Voltage at Normal State Latch PSON FPO PGI OUT PGO 4) Under Voltage at AC Input ON VCC POR PSON FPO PGI OUT PGO UVP Threshold AC Input Enable Latch ...

Page 10

FAN7680 5) Under Voltage at PSON ON/OFF PSON t FPO d3 PGI OUT PGO 6) Over Voltage at PSON ON/OFF Latch PSON FPO PGI OUT PGO 10 Latch PGI Threshold ...

Page 11

Application Information Power Good(PGO) and Power Good Delay A PC power supply is commonly designed to provide the motherboard with a power good signal, which is defined by the com- puter manufactures. If the +3.3V, +5V, and +12V outputs are ...

Page 12

FAN7680 during 75ms to avoid turn-on failure. At turn-off, there is an additional delay of 2.3ms from PSON to FPO. Power should be delivered to the rails only when the PSON signal is held at ground potential, thus the FPO ...

Page 13

Mechanical Dimensions Package Dimensions in millimeters 8-DIP FAN7680 13 ...

Page 14

FAN7680 Mechanical Dimensions Package 14 Dimensions in millimeters 8-SOP ...

Page 15

... Ordering Information Product Number FAN7680N FAN7680M Package Operating Temperature 8DIP -40°C ~ +125°C 8SOP FAN7680 15 ...

Page 16

... FAN7680 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. ...

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