參數(shù)資料
型號： S-817B24AMC-CWN-T2
廠商： Seiko Instruments Inc.
英文描述： SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR
中文描述： 超小型封裝CMOS電壓穩(wěn)壓器
文件頁數(shù)： 10/28頁
文件大?。?/td> 412K
代理商： S-817B24AMC-CWN-T2
ULTRA COMPACT CMOS VOLTAGE REGULATOR
S-817 Series
Rev.2.3
10
Seiko Instruments Inc.
Applied Circuits
1. Output Current Boosting Circuit
As shown in Figure 10, 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 10,
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/S-817B11AMC
(2)S-817A50ANB/S-817B50AMC
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 10 Output Current Boosting
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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相關代理商/技術參數(shù)
參數(shù)描述
S-817B24AMC-CWNT2G 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 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20
S-817B24AUA-CWN-T2 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR
S-817B24AUA-CWNT2G 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 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20
S-817B24AY-B2-U 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 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20
S-817B24AY-B-G 制造商:Seiko Instruments Inc (SII) 功能描述:IC REG LDO 2.4V 35MA TO92-3
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