參數(shù)資料
型號(hào)： S817
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(yè)數(shù)： 14/50頁(yè)
文件大?。?/td> 830K
代理商： S817
SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR
S-817 Series
Rev.3.0
_00
Seiko Instruments Inc.
14
Operation
1. Basic Operation
Figure 13
shows the block diagram of the S-817 Series.
The error amplifier compares the reference voltage (V
ref
) with V
fb
, which is the output voltage resistance-
divided by feedback resistors R
s
and R
f
.
It supplies the output transistor with the gate voltage necessary
to ensure a certain output voltage free of any fluctuations of input voltage and temperature.
Reference voltage
circuit
VOUT
*1
VSS
VIN
R
s
R
f
Error
amplifier
Current
supply
V
ref
+
V
fb
*1.
Parasitic diode
Figure 13
2. Output Transistor
The S-817 series uses a P-channel MOS FET as the output transistor.
Be sure that V
OUT
does not exceed V
IN
+
0.3 V to prevent the voltage regulator from being damaged due to
inverse current flowing from VOUT pin through a parastic diode to VIN pin.
3. Short Circuit Protection
The S-817A series incorporates a short circuit protection to protect the output transistor against short
circuit between VOUT pin and VSS pin. Installation of the short-circuit protection which protects the
output transistor against short-circuit between VOUT and VSS can be selected in the S-817A series. The
short-circuit protection controls output current as shown in the “
Typical Characteristics 1.”
. Output
Voltage versus Output Current, and suppresses output current at about 40 mA even if VOUT and VSS
pins are short-circuited.
The short-circuit protection can not be a thermal protection at the same time. Attention should be paid to
the Input voltage and the load current under the actual condition so as not to exceed the power
dissipation of the package including the case for short-circuit.
When the output current is large and the difference between input and output voltage is large even if not
shorted, the short-circuit protection may work and the output current is suppressed to the specified value.
In addition, S-817B series is removing a short-circuit protection, and is the product which enabled it to
pass large current.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
S-817 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR
S-817_1 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR
S8171AV34 制造商: 功能描述: 制造商:undefined 功能描述:
S-817A11ANB-CUA-T2 功能描述:低壓差穩(wěn)壓器 - LDO 1.1V 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-817A11ANB-CUAT2G 功能描述:低壓差穩(wěn)壓器 - LDO 1.1V 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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