參數(shù)資料
型號(hào)： S-81235
廠商： Seiko Instruments Inc.
英文描述： 3.5V±2.4% High-Precision Three-Terminal Positive Voltage Regulator(輸出電壓3.5V±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： 3.5V的± 2.4％高精度三端穩(wěn)壓器（輸出電壓為3.5V ± 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(yè)數(shù)： 14/33頁(yè)
文件大?。?/td> 337K
代理商： S-81235
HIGH-PRECISION VOLTAGE REGULATOR
S-812XXSG Series
Seiko Instruments Inc.
13
Operation
1
Basic operation
Figure 4 shows the block diagram of the S-812XXSG Series.
The error amplifier compares a reference voltage V
REF
with a
part of the output voltage fed back by the feedback resistors
R
A
and R
B
. It supplies the control transistor with the gate
current, necessary to keep a stable output voltage range not
influenced by input voltage or temperature fluctuation.
V
IN
Error amplifier
R
B
R
A
Current
source
-
+
V
OUT
GND
*
Reference
voltage
circuit
* Parasitic diode
Figure 4 Reference block diagram
2
Internal circuit
2.1 Reference voltage circuit
In a voltage regulator, the reference voltage circuit plays
a very important role because any change will show up
directly at an output.
The S-812XXSG Series has 0.8 V typical stable voltage
circuit as a highly stable reference voltage source.
Features:
Low power consumption
Good temperature characteristic
2.2 Error amplifier
The error amplifier consumes very low current because it
is a differential amplifier in a stable current circuit.
Features:
Good matching characteristics
Wide operating voltage range
Low offset voltage
2.3 Control transistor
The S-812XXSG Series has a Pch MOS transistor as a
current control transistor shown in Figure 6. Therefore
an output current I
OUT
is expressed by the following
formula where is only a small difference between input
and output voltages:
I
OUT
=KP{2(V
GS
-V
TP
)
(V
IN
-V
OUT
)-(V
IN
-V
OUT
)
2
}
*
KP
:
Conductive coefficiency
V
TP
:
Threshold voltage of a control transistor
Setting KP to the large value results in a voltage
regulator with 160 mV typical I/O voltage difference.
V
IN
-
V
IN
+
GND
V
IN
V
OUT
Figure 5 Error amplifier
Bias
V
IN
V
OUT
GND
V
GS
V
REF
-
+
*
* Parasitic diode
Figure 6 Control transistor
NOTE
: A parasitic diode is generated between V
IN
and V
OUT
.
If the electric potential of V
IN
is higher than that of
V
OUT
, IC may break because of a reverse current.
Keep V
OUT
less than V
IN
+0.3 V.
相關(guān)PDF資料
PDF描述
S-81236 3.6V±2.4% High-Precision Three-Terminal Positive Voltage Regulator(輸出電壓3.6V±2.4%，高精度三端（輸入端，輸出端，接地端）正電壓穩(wěn)壓器)
S-81237 3.7V±2.4% High-Precision Three-Terminal Positive Voltage Regulator(輸出電壓3.7V±2.4%，高精度三端（輸入端，輸出端，接地端）正電壓穩(wěn)壓器)
S-81240 5.0 AMP POSITIVE VOLTAGE REGULATOR
S-81242 4.2V±2.4% High-Precision Three-Terminal Positive Voltage Regulator(輸出電壓4.2V±2.4%，高精度三端（輸入端，輸出端，接地端）正電壓穩(wěn)壓器)
S-81245 4.5V±2.4% High-Precision Three-Terminal Positive Voltage Regulator(輸出電壓4.5V±2.4%，高精度三端（輸入端，輸出端，接地端）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-81235PG 制造商:Seiko Instruments Inc (SII) 功能描述:81235PG
S-81235SG 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:HIGH-PRECISION VOLTAGE REGULATOR
S-81235SG-QI-T1 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) U 628-812C35AM 06/02 RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L
S-81235SGUP-DQI-T1 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) U 628-812C35AU RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L
S-81235SGY-B 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) 3.5V 1.2uA 2.0% RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L
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