FAN7686N datasheet(2/14 Pages) FAIRCHILD

Part #	FAN7686N

Description	PC Power Supply Output Monitoring IC

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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FAN7685/FAN7686/FAN7687

2

Internal Block Diagrams

UVP

OVP

Delay

75ms

S

R

Q

PGI_O

FPO

PGO

3.6V

Q

PSON

H

L

H

L

H

LL

L

H

L

LL

clr

R

Delay

2.3ms

clr

R

POR

REF.

Start-up

Vref

Reset

Vcc

Debounce

38ms

PSON

LL

L

Vcc

3.6V

150uA

Oscillator

CLK

R

GND

H

Vref

VS12

VS5

VS33

IS33

IS5

IS12

PGI

VCC12

1

2

14

4

3

13

10

12

11

8

ISVCC12

8*Iref

Vcc

Iref

1.2V

RI

6

FPO

Debounce

73us

UVP

L

H

R CLK

Debounce

73us

H

L

PSON

Delay

300ms

H

clr

CLK

H

L

Short

Detector

when AC ON

L

UVP

Block

OVP

Block

OCP

COMPs

9

5

7

Power On Reset

L

(FAN7686)

FAN7687

FAN7685

UVP

OVP

Delay

75ms

Debounce

73us

S

R

Q

PGI_O

FPO

PGO

3.6V

Q

PSON

H

L

H

L

H

LL

L

H

L

clr

R

Delay

2.3ms

clr

PWR

R

POR

REF.

Start-up

Vref

Reset

Vref

Vcc

Debounce

38ms

PSON

LL

L

Vcc

3.6V

150uA

Oscillator

CLK

R

GND

UVP

L

H

Vref

VS12

VS5

VS33

IS33

IS5

IS12

PGI

Vcc

Iref

1.2V

RI

Vcc

6

1

2

14

4

3

13

9

8

5

L

FPO

L

H

R CLK

Debounce

73us

H

L

PSON

Delay

300ms

H

clr

CLK

H

L

Short

Detector

when AC ON

L

10

12

11

8*Iref

(7)

(8)

(9)

FAN7687A

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FAN7686N Datasheet(PDF) 2 Page - Fairchild Semiconductor

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