S1F76980 Epson Electronics America, Inc., S1F76980 Datasheet - Page 15

• Manufacturer Part Number: S1F76980
• Description: Power Supply Input Control Ic
• Manufacturer: Epson Electronics America, Inc.

(4) Power supply switching operation 1 (OFF-OFF switching)
Fig.8.4.3 shows an example of power supply switching operation 1 on connection / disconnection of power
supply with a higher priority level.
Description of each state
State A: Input power not selected.
State B: V
State C: V
State D: V
State E: V
Description of transition conditions
S1F76980 Technical Manual (Rev.1.0)
: V
: V
: V
: V
: V
: V
State C
(Typ. 19mV)
(V
CC
CC
CC
CC
CC
CC
BAT
& V
& V
input disabled, V
input disabled, V
& V
(OB1:OFF, OB2:OFF, OU1:OFF, OU2:OFF, OC1:OFF, OC2:OFF)
(OB1:ON, OB2:OFF, OU1:OFF, OU2:OFF, OC1:OFF, OC2:OFF)
(OB1:ON, OB2:ON, OU1:OFF, OU2:OFF, OC1:OFF, OC2:OFF)
(OB1:OFF, OB2:OFF, OU1:OFF, OU2:OFF, OC1:ON, OC2:OFF)
(OB1:OFF, OB2:OFF, OU1:OFF, OU2:OFF, OC1:ON, OC2:ON)
input disabled, V
CC
) and V
BAT
BAT
CC
BAT
BAT
BAT
input power supply selected, full on state
input power supply selected, backflow from V
input power supply selected, backflow from V
input power supply selected, full on state
input enabled
input enabled, backflow potential between input power supply (V
input enabled, elimination of backflow potential between input power supply (V
OUT
Fig.8.4.3 V
(Typ. 19 mV)
BAT
BAT
BAT
State B
input enabled
input enabled, backflow potential between input power supply (V
input enabled, elimination of backflow potential between input power supply
BAT
⇔ V
CC
power supply switching state transition 1
State A
EPSON
OUT
OUT
prevented
prevented
8. FUNCTIONAL DESCRIPTION
State D
CC
) and V
OUT
BAT
CC
State E
) and V
) and V
OUT
OUT
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