HIGH WITHSTAND-VOLTAGE VOLTAGE REGULATOR WITH RESET FUNCTION
Rev.8.0_00
S-87x Series
Seiko Instruments Inc.
31
S-87xxxxEUP
VSS
VOR
VIN
SENSE
VOUT
I
IN
R
IN
R
L
C
OUT
Figure 24 Attention connecting example 2
A drop in V
IN
due to
rush current
V
DET
Power Voltage
V
DET
V
HYS
ΔV
IN
V
IN
Voltage
V
OR
Figure 25 When ΔV
IN
>V
HYS
2. In the E type, the minimum operating voltage becomes 2.0 V as V
IN
voltage. If a drop
in V
IN
voltage occurs due to load current or rush current to be charged to the output
capacitor when load current or the voltage regulator is powered on at the time of
release, set V
IN
to 2.0 V or more.
3. Also, in the E type, when sharply increasing only VIN pin voltage at 1 ms/V or less,
with the SENSE pin fixed to −V
DET
≥V
SENSE
≥−V
DET
−2 V, a release pulse is output to the
output pin of voltage detector. Be careful. In this case, this release pulse is removed
by setting the time constant of VOR
pin 20 ms or more with capacitance and pull-up
resistance. In addition, when the voltage of SENSE pin is fixed to between the
detection voltage and the release voltage at the detect condition, if sharply increasing
only VIN pin voltage at 1 ms/V or less, the output of the detector turns to the release
condition. If this action is a problem in your system, please connect SENSE pin to
VIN pin.
