Epson Power Supply IC S1F70000 Technical Manual page 144

R helps reduce the affect of I
1
quired when I is lower than the diode bias current.
SS
For certain input voltages, a Zener diode with the re-
verse polarity can be used.
High Input Voltages
A preliminary regulator circuit is required to bring the
input voltage within the S1F79100Y series rated range.
V
SS
V
I
V
I
S1F70000 Series
Technical Manual
on V . It is also re-
SS F
GND
V
O
S1F79100Y
V
O
EPSON
Switching Output
S1F79100Y series devices are designed for continuous
operation. An external switching circuit allows the
regulated output to be switched ON and OFF.
V
SS
ON/OFF
control signal
V
I
V
I
Note) Temperatures during reflow soldering must re-
main within the limits set out under LSI Device
Precautions in this catalog. Do not immerse
QFP and SOT89 packages during soldering, as
the rapid temperature gradient during dipping
can cause damage.
S1F79100Y Series
GND
V
O
S1F79100Y
V
O
3–37