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參數(shù)資料
| 型號： | S-812C28AUA-C2I-T2 |
| 廠商： | Seiko Instruments Inc. |
| 英文描述： | HIGH OPERATING VOLTAGE CMOS VOLTAGE REGULATOR |
| 中文描述： | 高工作電壓CMOS電壓穩(wěn)壓器 |
| 文件頁數(shù)： | 9/26頁 |
| 文件大?。?/td> | 332K |
| 代理商： | S-812C28AUA-C2I-T2 |
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Rev.1.0
S-812C Series
HIGH OPERATING VOLTAGE CMOS VOLTAGE REGULATOR
Seiko Instruments Inc.
9
Application Circuits
1. Output Current Boost Circuit
As shown in Figure 11, the output current
can be boosted by externally attaching a
PNP transistor. The S-812C controls the
base current of the PNP transistor so that the
output voltage V
OUT
becomes the voltage
specified in the S-812C if the sufficient base-
emitter voltage V
BE
to turn on the PNP
transistor is obtained between input voltage
V
IN
and S-812C power source pin VIN.
As the transient response characteristics
of the circuit shown in figure 11 is not enough in some applications, evaluation for output variation due to
power-on, power line variation and load variation in actual condition is needed before massproduction.
Note that the short-circuit protection incorporated in the S-812C series does not work as a short-circuit
protection for the boost circuit.
2. Constant Current Circuit
The S-812C series can be served in a
constant current circuit as shown in the
figure 12. Constant current I
O
is calculated
from the following equation:
I
O
= (V
OUT
(E)
÷
RL) +I
SS,
where V
OUT
(E) is
the effective output voltage.
Please note that in case of the circuit
shown in the figure 12 (1) the magnitude of
the constant current I
O
is limited by the
driving ability of the S-812C.
The circuit shown in the figure 12 (2) can,
however, provide the current beyond the
driving ability of the S-812C by combining a
constant current circuit with a current boost
circuit. The maximum input voltage for the
constant current circuit is the sum of the
voltage V
O
of the device and 16 V. It is not
recommended to attach a capacitor
between the S-812C power source VIN
and VSS pins or between output VOUT
and VSS pins because rush current flows
at power-on.
3. Output Voltage Adjustment Circuit
The output voltage can be increased using the configuration shown in the figure 13. The output Voltage V
OUT
1
can be calculated using the following equation;
V
OUT
1 = V
OUT
(E) x (R1 + R2)
÷
R1 + R2 x I
SS
,
where V
OUT
(E) is the effective output voltage
.
Value of R1 and R2 should be determined so as not to be affected by the current consumption I
SS
.
R1
Tr1
GND
VOUT
ON/OFF
VIN
VSS
V
IN
V
OUT
C
L
Figure 11 Output Current Boost Circuit
S-812C
Series
C
IN
I
(2) Constant Current Boost Circuit
Figure 12 Constant Current Circuits
R1
GND
Device
RL
VIN
VOUT
V
IN
V0
VSS
S-812C
Series
Tr1
V
O
GND
Device
RL
VOUT
VIN
V
IN
V0
V
O
I
O
C
IN
C
IN
VSS
(1) Constant Current Circuit
S-812C
Series
o
ON/OFF
ON/OFF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S-812C28AUA-C2IT2G | 功能描述:低壓差穩(wěn)壓器 - LDO 2.8V 1.0uA 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-812C28AUA-C2IT2U | 功能描述:IC REG LINEAR 30MA SOT89-3 制造商:ablic u.s.a. inc. 系列:* 包裝:剪切帶（CT） 零件狀態(tài):在售 穩(wěn)壓器數(shù):1 電流 - 輸出:30mA 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:TO-243AA 供應(yīng)商器件封裝:SOT-89-3 標(biāo)準(zhǔn)包裝:1 |
| S-812C28AY-B | 功能描述:低壓差穩(wěn)壓器 - LDO 2.8V 1.0uA 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-812C28AY-B2-U | 功能描述:低壓差穩(wěn)壓器 - LDO 2.8V 1.0uA 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-812C28AY-B-G | 制造商:Seiko Instruments Inc (SII) 功能描述:IC REG LDO 2.8V 0.03A TO92-3 |
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