參數(shù)資料
型號(hào)： S-817A20
廠商： Seiko Instruments Inc.
英文描述： 2.0V±2.0% Ultra Compact 3-Pin Positive Voltage Regulator(輸出電壓2.0V±2.0%,緊湊型結(jié)構(gòu)3腳正電壓穩(wěn)壓器)
中文描述： 2.0V的± 2.0％，超小型3引腳正電壓穩(wěn)壓器（輸出電壓2.0V的± 2.0％，緊湊型結(jié)構(gòu)3腳正電壓穩(wěn)壓器）
文件頁(yè)數(shù)： 9/23頁(yè)
文件大?。?/td> 414K
代理商： S-817A20
ULTRA COMPACT CMOS VOLTAGE REGULATOR
S-817 Series
Rev.1.1
8
Seiko Instruments Inc.
2. Constant Current Circuit
The S-817 Series can be configured as a
constant current circuit. See Figure 8.
Constant amperage I
O
is calculated using
the following equation
(V
OUT
(E): Effective output voltage):
I
O
= (V
OUT
(E)
÷
RL) +I
SS
.
Please note that it is impossible to set
constant amperage I
O
in case of circuit
(1) of Figure 8 to the value exceeding the
drive ability of the S-817.
However, circuit (2) of Figure 8 is an
example to set constant amperage to the
value exceeding the drive ability of the S-
817. Circuit (2) incorporates a current
boosting circuit. The maximum input
voltage of the constant current circuit is
the value obtained by adding 10 V to
voltage V
O
of the device. It is not
recommended to attach a capacitor
between the S-817 power source VIN and
VSS pins or between output VOUT and
VSS pins because rush current flows at
powering on. An example of input
voltage between V
IN
and VO in circuit (2)
vs. I
O
current characteristics
(Ta = 25
°
C, typ.) is illustrated in Figure 9.
3. Output Voltage Adjustment Circuit
The output voltage can be boosted by using the
configuration shown in Figure 10. The output Voltage
V
O
can be calculated using the following equation
(V
OUT
(E):Effective output voltage):
V
O
= V
OUT
(E) x (R1 + R2)
÷
R1 + R2 x I
SS
Set R1 and R2 to high values of resistance so as not to
be affected by current consumption I
SS.
Capacitor C1 is effective in minimizing output
fluctuation at powering on or due to power or load
fluctuation. Determine the optimum value on your
actual device.
It is not also recommended to attach a
capacitor between the S-817 power
source VIN and VSS pins or between
output VOUT and VSS pins because
output
fluctuation
powering on might occur.
or
oscillation
at
I
(2) Constant Current Boosting Circuit
Figure 8 Constant Current Circuit
R1
GND
Device
RL
VOUT
V
IN
V0
C
IN
VSS
S-817
Series
Tr1
V
O
GND
Device
RL
VOUT
VIN
V
IN
V0
V
O
I
O
C
IN
VSS
(1) Constant Current Circuit
S-817
Series
o
0.00
0.10
0.20
0.30
0.40
0.50
0.60
1.4
1.6
1.8
V
IN
-V
O
(V)
2
2.2
2.4
Io (A)
S-817A11ANB; V
IN
-V
O
pins, Input voltage-I
O
current
Tr: 2SK1213Y, R1: 1k
,V
O
=2V
RL
=
1.83
2.2
2.75
3.67
5.5
11
GND
V0
R2
R1
VOUT
VIN
V
IN
C
L
C1
C
IN
VSS
Figure 10 Voltage Adjustment Circuit
S-817
Series
Figure 9 Input Voltage vs Current Characteristics
相關(guān)PDF資料
PDF描述
S-817A25 2.5V±2.0% Ultra Compact 3-Pin Positive Voltage Regulator(輸出電壓2.5V±2.0%,緊湊型結(jié)構(gòu)3腳正電壓穩(wěn)壓器)
S-817A30 3.0V±2.0% Ultra Compact 3-Pin Positive Voltage Regulator(輸出電壓3.0V±2.0%,緊湊型結(jié)構(gòu)3腳正電壓穩(wěn)壓器)
S-817A33 3.3V±2.0% Ultra Compact 3-Pin Positive Voltage Regulator(輸出電壓3.3V±2.0%,緊湊型結(jié)構(gòu)3腳正電壓穩(wěn)壓器)
S-817A35 3.5V±2.0% Ultra Compact 3-Pin Positive Voltage Regulator(輸出電壓3.5V±2.0%,緊湊型結(jié)構(gòu)3腳正電壓穩(wěn)壓器)
S-817A40 4.0V±2.0% Ultra Compact 3-Pin Positive Voltage Regulator(輸出電壓4.0V±2.0%,緊湊型結(jié)構(gòu)3腳正電壓穩(wěn)壓器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
S-817A20ANB-CUJ-T2 功能描述:低壓差穩(wěn)壓器 - LDO 2.0V 1.2uA 2.0% RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
S-817A20ANB-CUJT2G 功能描述:低壓差穩(wěn)壓器 - LDO 2.0V 1.2uA 2.0% RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
S-817A20APF-CUJTFG 功能描述:低壓差穩(wěn)壓器 - LDO Linear LDO regulator 1.2uA Iq 75mA Iout RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
S-817A21ANB-CUK-T2 功能描述:低壓差穩(wěn)壓器 - LDO 2.1V 1.2uA 2.0% RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
S-817A21ANB-CUKT2G 功能描述:低壓差穩(wěn)壓器 - LDO 2.1V 1.2uA 2.0% RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
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