FAN7687 Fairchild Semiconductor, FAN7687 Datasheet - Page 2

• Manufacturer Part Number: FAN7687
• Description: PC Power Supply Output Monitoring IC
• Manufacturer: Fairchild Semiconductor

FAN7685/FAN7686/FAN7687
Internal Block Diagrams
2
VS33
ISVCC12
VS12
IS33
IS12
VCC12
VS5
Vcc
IS5
VS33
VS12
VS5
IS33
IS12
IS5
13
10
12
11
9
8
5
(9)
(8)
(7)
13
10
12
11
9
8
5
7
8*Iref
8*Iref
Vcc
Vcc
8*Iref
8*Iref
Start-up
Start-up
Block
Block
Vref
OVP
Vcc
UVP
RI
Vcc
6
RI
6
Iref
Iref
COMPs
OCP
Power On Reset
REF.
POR
OVP
UVP
UVP
L
REF.
POR
L
L
PGI_O
L
1.2V
Reset
OVP
1.2V
H
L
Delay
L
75ms
Reset
PGI
H
L
Delay
75ms
3.6V
Vref
Oscillator
clr
PGI_O
PGI
1
3.6V
Vref
Oscillator
clr
L
H
1
L
H
CLK
L
R
CLK
Vref
L
R
Vref
CLK
L
CLK
PSON
PSON
UVP
UVP
H
H
L
L
L
L
L
L
L
Q
L
Q
Debounce
Debounce
CLK
CLK
73us
73us
R
R
L
L
PSON
L
L
Delay
2.3ms
2.3ms
PSON
H
Delay
H
PSON
PSON
clr
Debounce
clr
Debounce
L
L
R
R
73us
73us
L
L
L
3.6V
L
3.6V
CLK
CLK
CLK
CLK
R
R
S
S
Debounce
Debounce
R
R
R
R
H
H
38ms
H
38ms
Q
Q
when AC ON
when AC ON
CLK
Detector
CLK
Detector
Short
Short
L
L
L
L
L
L
PWR
L
clr
L
H
clr
L
H
L
3.6V
H
L
300ms
3.6V
Delay
H
300ms
CLK
Delay
H
FPO
CLK
FPO
H
Vcc
Vcc
150uA
H
150uA
H
L
L
H
L
L
14
3
4
2
14
3
4
2
PGO
PSON
FPO
GND
PGO
FPO
PSON
GND
FAN7685
(FAN7686)
FAN7687
FAN7687A