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US431ALCSのメーカーはUNISEMです、この部品の機能は「LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR」です。 |
部品番号 | US431ALCS |
| |
部品説明 | LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR | ||
メーカ | UNISEM | ||
ロゴ | |||
このページの下部にプレビューとUS431ALCSダウンロード(pdfファイル)リンクがあります。 Total 6 pages
FEATURES
SOT23-5 package
0.5% Voltage Reference Initial Accuracy
(US431AL)
Low Operational Cathode Current
(80 uA max)
Unconditionally Stable with only 1uF
Adjustable Output from 1.24V to 6V
0.25Ω Typical Output Impedance
Pin to Pin Compatible with TLV431
APPLICATIONS
Precision Voltage Reference
Linear Regulator Controller
Secondary Side Controller for the Low Voltage
Power Supply Applications
US431L/431AL
LOW -VOLTAGE ADJUSTABLE
PRECISION SHUNT REGULATOR
PRELIMINARY DATASHEET
DESCRIPTION
The US431L product is a 3 terminal adjustable shunt
regulator that can also be used as a precision voltage
reference. Its output voltage may be set to any value
between Vref(1.24V) and 6V with two external resistors
as shown in the typical application circuit. Other appli-
cations of this device include the use as a merged am-
plifier and reference in applications such as Linear regu-
lator or as the secondary side controller in low voltage
power supply applications. The US431L only requires
80uA maximum quiescent current before regulating,
making it ideal as a voltage reference for battery type
applications.
TYPICAL APPLICATION
RB
V IN
US431
Vo = Vref × 1+ RR21
431app1-1.0
VO
R1
Co
R2
Typical application of the US431L as a shunt regulator / voltage reference.
PACKAGE ORDER INFORMATION
Ta (°C)
0 TO 70
0 TO 70
5 LEAD
SOT23-5
US431LCL
US431ALCL
Rev. 1.2
5/11/98
3 PIN PLASTIC
TO-92
US431LCZ
US431ALCZ
8 PIN PLASTIC
SOIC
US431LCS
US431ALCS
2-1
1 Page Pin Descriptions
SOT 23
PIN#
4
TO 92
PIN#
1
8 PIN
SOIC
PIN#
8
33
1
52
3,6
1,2 NA
2,4,5,7
US431L/431AL
PIN SYMBOL
Ref
Cathode
Anode
NC
Pin Description
A resistor divider from this pin to the Cathode pin and
ground sets the output voltage.
The output of the shunt regulator .A minimum of 1uF
capacitor must be connected from this pin to Anode pin
to insure unconditional stability.
Ground pin. This pin must be connected to the lowest
potential in the system & all other pins must be at higher
potential with respect to this pin.
These pins are not connected internally.
BLOCK DIAGRAM
Cathode
Ref
+
1.24V
431blk1-1.0
Anode
Figure 1 - Simplified block diagram of the US431L
Rev. 1.2
5/11/98
2-3
3Pages US431L/431AL
TYPICAL APPLICATION
I740 Application
V IN
12V
Q1
C1
R1
U1
431app3-1.1
V OUT
C2
R2
R3
Figure 3- Low cost 3.3V to 2.7V 0utput for Intel I740 application.
Ref Desig
U1
C1,2
R1
R2
R3
HS1
Description
Shunt Regulator
Capacitor
Resistor
Resistor
Resistor
Heat Sink
Qty Part #
Manuf
1 US431L
Unisem
2 Elect,220uF,6.3V,ECAOJFQ221 Panasonic
1 6.2kΩ, 5%, SMT
1 118Ω, 1%, SMT
1 100Ω, 1% SMT
Use minimum of 1" Square Copper Pad area
for load current <4A
2-6
Rev. 1.2
5/11/98
6 Page | |||
ページ | 合計 : 6 ページ | ||
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PDF ダウンロード | [ US431ALCS データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
US431ALCL | LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR | UNISEM |
US431ALCS | LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR | UNISEM |
US431ALCZ | LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR | UNISEM |