參數資料
型號： S-81250
廠商： Seiko Instruments Inc.
英文描述： 5.0V±2.4% High-Precision Three-Terminal Positive Voltage Regulator(輸出電壓5.0V±2.4%，高精度三端（輸入端，輸出端，接地端）正電壓穩(wěn)壓器)
中文描述： 5.0V ± 2.4％高精度三端穩(wěn)壓器（輸出電壓5.0V ± 2.4％，高精度三端（輸入端，輸出端，接地端）正電壓穩(wěn)壓器）
文件頁數： 19/33頁
文件大?。?/td> 337K
代理商： S-81250
HIGH-PRECISION VOLTAGE REGULATOR
S-812XXSG Series
18
Seiko Instruments Inc.
2.
Circuits for increasing output voltage
3.
Constant current regulator
4.
Dual supply
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.
V
OUT
=Vxx
1
1
2
1
2
2
1
R
R
Iss R
Vxx
R
R
Because of its low current consumption, the
S-812XXSG Series can set the resistor values, and R
1
and R
2
high to lower the power consumption of whole
systems.
Current flows to the Zener diode (Di) through the
quiescent current (I
) 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.
GND
V
OUT
I
SS
R
2
R
1
V
OUT
V
IN
V
IN
V
XX
S-812XXSG
Series
Figure 14
Di
GND
R
I
SS
V
OUT
V
OUT
V
IN
V
IN
S-812XXSG
Series
Figure 15
The S-812XXSG Series can be used as a constant-
current regulator within allowable dissipation limits.
I
OUT
=
V
XX
R
A
+ I
SS
I
OUT
R
L
GND
V
XX
GND
I
SS
R
A
V
OUT
V
IN
V
IN
S-812XXSG
Series
Figure 16 Constant current regulator
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.
V
OUT
2
GND
GND
GND
IC2
IC
V
OUT
V
OUT
+5 V
+8 V
V
OUT
1
V
IN
V
IN
R
V
IN
S-81230
SG
S-81250
SG
Figure 17 Dual power source
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