Pin Descriptions; Functional Descriptions - Epson Power Supply IC S1F70000 Technical Manual

S1F77200Y Series

PIN DESCRIPTIONS

PIN ASSIGNMENTS

FUNCTIONAL DESCRIPTIONS

The S1F77200Y series has the circuit configuration as
shown in the figure below. For the detection, divided
potential (V ) across the resistors inserted across the
REG
power supply and the reference voltage (V
ated on the IC are entered to the voltage comparator.
Since the voltage comparator is designed to detect a tar-
get voltage even when potential difference between
V and Vref minute, hysteresis is added so that the
REG
comparator may not fail due to noise on the power sup-
ply and such. In the example shown in the figure below,
V
DD
(2pin)
V
SS
(3pin)
5–4
Pin No. Pin name
1 OUT
2 V
DD
3 V
SS
1
) gener-
REF
R1
(V )
REG
T
R2
T
V
R3
Description
Voltage detection output pin
Input voltage pin (positive side)
Input voltage pin (negative side)
SOT89-3pin
2 3
detection voltage (V
relief voltage (V
set based the following formula.
Detection voltage: V
Relief voltage:
+
—
REF
EPSON
) for the input voltage drop and
DET
) for the increased input voltage are
REL
R1+R2+R3
=
DET
R2+R3
R1+R2+R3
V =
REL
R3
OUT
(1pin)
• V
REF
• V
REF
S1F70000 Series
Technical Manual