FAN7680N

FAN7680N Datasheet

FAN7680

Part	Datasheet
FAN7680N	FAN7680N (pdf)

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FAN7680 PC Power Supply Outputs Monitoring IC • 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 • PC Power Supply 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 output 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. 8-DIP 1 8-SOP OVP The FAN7680 has OVP functions for +3.3V, +5V, +12V Vcc outputs. This block is made up of three comparators 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 comparators 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. 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" The power good signal generator provides a signal according to output voltage conditions of a power supply for safe operation 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" 2003 Fairchild Semiconductor Corporation FAN7680 Internal Block Diagram VCC 7 VS5 6 VS33 5 PGI 1 Start-up REF. 3.6V Vref Oscillator CLK PSON clr Delay 2.3ms Reset UVP L Delay 75ms R L Debounce L 73us L PGI_O H Vref OVP L Vref PSON L Debounce L 38ms R CLK UVP L PSON L R CLK H Debounce H Delay H Ordering Information Product Number FAN7680N FAN7680M Package 8DIP 8SOP Operating Temperature -40°C ~ +125°C FAN7680 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. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 6/23/03 0.0m 001 2003 Fairchild Semiconductor Corporation

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FAN7680

PC Power Supply Outputs Monitoring IC
• 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
• PC Power Supply

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 output 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.
8-DIP
1 8-SOP

OVP The FAN7680 has OVP functions for +3.3V, +5V, +12V Vcc outputs. This block is made up of three comparators 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 comparators 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.

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"

The power good signal generator provides a signal according to output voltage conditions of a power supply for safe operation 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"
2003 Fairchild Semiconductor Corporation

FAN7680

Internal Block Diagram

VCC 7 VS5 6 VS33 5

PGI 1

Start-up

REF.
3.6V Vref

Oscillator CLK

PSON
clr Delay
2.3ms

Reset

UVP L

Delay 75ms

R L Debounce L
73us

L PGI_O

H Vref

OVP L Vref

PSON L Debounce L 38ms

R CLK

UVP L

PSON L

R CLK

H Debounce H Delay H
Ordering Information

Product Number FAN7680N FAN7680M

Package 8DIP 8SOP

Operating Temperature -40°C ~ +125°C

FAN7680

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.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:

Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.

A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
6/23/03 0.0m 001 2003 Fairchild Semiconductor Corporation

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Datasheet ID: FAN7680N 513987