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參數(shù)資料
| 型號： | 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） |
| 文件頁數(shù)： | 8/23頁 |
| 文件大?。?/td> | 414K |
| 代理商： | S-817A20 |
Rev.1.1
S-817 Series
ULTRA COMPACT CMOS VOLTAGE REGULATOR
Seiko Instruments Inc.
7
n
Applied Circuits
1. Output Current Boosting Circuit
As shown in Figure 7, the output current can
be boosted by externally attaching a PNP
transistor. The base current of the PNP
transistor is controlled so that output voltage
V
OUT
goes the voltage specified in the S-817
when base-emitter voltage VBE necessary to
turn on the PNP transistor is obtained
between input voltage V
IN
and S-817 power
source pin VIN.
The following are tips and hints for selecting
and ensuring optimum use of external parts:
=
PNP transistor Tr1:
1. Set h
FE
to approx. 100 to 400.
2. Confirm that no problem occurs due to power dissipation under normal operation conditions.
=
Resistor R1:
Generally set R1 to 1 k
÷
V
OUT
(S) (the voltage specified in the S-817 Series) or more.
=
Output capacitor CL:
Output capacitor CL is effective in minimizing output fluctuation at powering on or due to power or load
fluctuation, but oscillation might occur. Always connect resistor R2 in series to output capacitor CL.
=
Resistor R2: Set R2 to 2
x V
OUT
(S) or more.
=
DO NOT attach a capacitor between the S-817 power source VIN and GND pins or between base and
emitter of the PNP transistor to avoid oscillation.
=
To improve transient response characteristics of the output current boosting circuit shown in Figure 7,
check that no problem occurs due to output fluctuation at powering on or due to power or load fluctuation
under normal operating conditions.
=
Pay attention to the short current limit circuit incorporated into the S-817 Series because it does not
function as a shortcircuiting protection circuit for this boosting circuit.
The following graphs show the examples of input-output voltage characteristics (Ta = 25
°
C, typ.) in the output
current boosting circuit:
(1) S-817A11ANB
(2)S-817A50ANB
Tr1: 2SA1213Y, R1: 1k
, CL: 10μF, R2: 2
Tr1: 2SA1213Y, R1: 200
, CL: 10μF, R2: 10
R2
R1
Tr1
GND
VOUT
VIN
VSS
V
IN
V
OUT
C
L
Figure 7 Output Current Boosting Circuit
S-817
Series
C
IN
4.60
4.70
4.80
4.90
5.00
5.10
5.20
5.2
5.3
5.4
5.5
V
IN
(V)
5.6
5.7
5.8
5.9
V
O
100mA
50mA
10mA
5mA
800mA
600mA
400mA
200mA
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.4
1.5
1.6
1.7
1.8
1.9
2
2.1
2.2
2.3
2.4
V
IN
(V)
V
O
(
800mA
600mA
400mA
200mA
10mA
1mA
50mA
100mA
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 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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