8. FUNCTIONAL DESCRIPTION
S1F76980 Technical Manual (Rev.1.0)
EPSON
13
Description of transition conditions
{
: V
CC
& V
BAT
input enabled
|
: V
CC
& V
BAT
input enabled, elimination of backflow potential between input power supply (V
CC
) and V
OUT
(Typ. 19mV) (TBD)
}
: V
CC
& V
BAT
input enabled, backflow potential between input power supply (V
CC
) and V
OUT
~
: V
CC
input disabled, V
BAT
input enabled
: V
CC
input disabled, V
BAT
input enabled, elimination of backflow potential between input power supply
(V
BAT
) and V
OUT
: V
CC
input disabled, V
BAT
input enabled, backflow potential between input power supply (V
BAT
) and V
OUT
: V
CC
& V
BAT
input enabled, elimination of backflow potential between input power supply (V
CC
) and V
OUT
(Typ. 19mV), simultaneous ON-time (Typ. 800
µ
s) lapse
: V
CC
& V
BAT
input enabled, backflow potential between input power supply (V
CC
) and V
OUT
(Typ. 19mV),
simultaneous ON-time (Typ.800
µ
s) lapse
Fig.8.4.4 V
BAT
⇔
V
CC
power switching state transition 2
(Note 7) For ON-ON switching, input power supply is temporarily shorted. We recommend OFF-OFF
switching, however, use ON-ON switching on your own authority after carefully evaluating the
switching in the set if you want to minimize voltage drop when switching power supply. SEIKO
EPSON, however, shall not be liable for any defective conditions or the like due to backflow to input
power supply caused by ON-ON switching.
(Note 8) Combining the V
BAT
priority (BSEL=LOW) pin with the ON-ON switching (ONOFSW=HIGH) pin
generates abnormal output waveforms at switching; therefore, this combination should be avoided to
output normal waveforms.
