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CIRCUIT DESCRIPTION
GND
Switch (3) (4) off input
GND
OFF
Switch (1) #0
Switch
(1) (2) contro!
$11
Switch (2) vO.
C12
Power supply (-)
$20
Switch (3) VO
$21
L
OFF
OFF|C34|
830-B31
831-B32
B40-B41
B41-B42
L
ON
OFF
L
H
OFF
ON
pee [or
[or
Switch
(3) (4) control
vss
PST620D
(RESET IC)
@ GND
PS CONT
m
PIN NAME
FUNCTION
Vac
Holds +2.0V detection voltage , conducts rapid power failure detection by monitoring
the primary
side of the AC power supply (which is the original source of all power) and
the
stabilizirg
power
supply.
+5V main power supply
Backup power supply (connected to backup condensor)
Pulse sharper pulse width setting pin (connect to condensor and resistor)
Reset output
Pulse sharper output
ON-OFF switch
Hi: OFF
Lo: ON
Chip enable signal output
GND
(earth)
35
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