S1F76980 Epson Electronics America, Inc., S1F76980 Datasheet - Page 12

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

8. FUNCTIONAL DESCRIPTION
(Note 3) The power switch built in the output guarantee circuit may be turned ON/OFF by the PSW pin only for
(Note 4) The detecting voltage dead time of power voltage monitoring may be specified by external capacitor
For detecting voltage = 1.6V, detecting voltage dead setting time TBDLY [S] = Set coefficient (147) × C [µF]
In case of the recommended C=6800[pF], the release delay time is TBDLY=1[S].
For detecting voltage = 2.8V, detecting voltage dead setting time TBDLY [S] = Set coefficient (250) × C [µF]
In case of the recommended C=6800[pF], the release delay time is TBDLY=1.7[S].
8
PSW
V
(Note 3)
BAT
the V
only for the V
for 6800pF. However, when the voltage is temporarily below the output guarantee voltage, low voltage
is detected even during the dead time.
BAT
guarantee
Output
-system power supply.
Fig.8.2.3 Block diagram for V
XOFF
BAT
-system power supply. The recommended value of the capacitor is approximately 1s
The power is turned off when the voltage is below the
output guarantee voltage.
R1
R2
R3
V
REG
V
REF
+
-
CMP
EPSON
BAT
power voltage monitoring circuit
S1F76980 Technical Manual (Rev.1.0)
Typ.
Typ.
CBDLY
BDET
(Note 4)