Switching Control Circuit - Epson S1F76980 Technical Manual

8.3 Switching Control Circuit

This circuit controls output of a signal that selects optimum input power supply according to input conditions of
three power supplies (V
(1) Power input control logic
(Note 5) The priority sequence may be changed with the BSEL pin.
It can be switched even during operation of IC.
(Note 6) L: Input disabled, H: Input enabled
(2) Switch configuration
Fig.8.4.1 shows the configuration diagram of power supply selection switches, that are configured outside the
IC.
The O*1 (OC1, OU1, and OB1) pin performs over voltage limiter control while the O*2 (OC2, OU2, and OB2)
pin controls backflow prevention.
V
OC1
OC2
S1F76980 Technical Manual (Rev.1.0)
, V , and V ) and in the priority sequence set in the IC.
CC BUS BAT
V V
CC BUS
L L
L L
L H
L H
H L
H L
H H
H H
CC
OU1
OU2
Fig.8.4.1 Switch configuration
8. FUNCTIONAL DESCRIPTION
V
BAT
Output selection system
L
H
L
H
L
H
L
H
V
BUS
OB1
OB2
V
OUT
EPSON
V
OUT
OFF
( )
V
BAT
9