S-81218SG データシートの表示（PDF） - Seiko Instruments Inc
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S-81218SG Datasheet PDF : 33 Pages
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HIGH-PRECISION VOLTAGE REGULATOR
S-812XXSG Series
2. Circuits for increasing output voltage
If the output voltage you need cannot be found in our
product line-up, the designs in Figures 14 or 15 will
increase output voltages easily.
VOUT=Vxx
1
R2
R1
Iss R2
Vxx1 R2
R1
Because of its low current consumption, the
S-812XXSG Series can set the resistor values, and R1
and R2 high to lower the power consumption of whole
systems.
Current flows to the Zener diode (Di) through the
quiescent current (ISS) of the S-812XXSG Series, and
the GND terminal rises for the voltage of DI.
When Di cannot drive with a quiescent current, the
added resistance R increases the current flowing
through DI.
3. Constant current regulator
The S-812XXSG Series can be used as a constant-
current regulator within allowable dissipation limits.
IOUT = VXX
RA
+ ISS
4. Dual supply
A dual supply can be formed using the S-812XXSG
Series.
Figure 17 shows a circuit example for receiving two
outputs (5 V and 8 V) with the S-81230SG and the S-
81250SG. As the resistance R lets the quiescent
current of IC1 pass, R is unnecessary if the minimum
output current of IC2 is more than the IC1 quiescent
current.
VIN VIN S-812XXSG VOUT
Series
GND
R1
VXX
ISS
R2
VOUT
Figure 14
VIN VIN S-812XXSG VOUT
Series
GND
R
ISS
Di
Figure 15
VOUT
VIN VIN S-812XXSG VOUT
Series
GND
VXX
RA
ISS
IOUT
GND
RL
Figure 16 Constant current regulator
IC
VIN
VIN S-81230 VOUT
SG
IC2
GND
VIN S-81250 VOUT
SG
GND
R
GND
VOUT1
+8 V
VOUT2
+5 V
Figure 17 Dual power source
18
Seiko Instruments Inc.
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