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PDF SE431 Data sheet ( Hoja de datos )
| Número de pieza | SE431 | |
| Descripción | ADJUSTABLE PRECISION SHUNT REGULATOR | |
| Fabricantes | Seaward | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SE431 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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SEAWARD
ELECTRONICS
Adjustable Precision
Shunt Regulator
SE431
Description
The SE431 is a low voltage three terminal
adjustable shunt regulator with a guaranteed thermal
www.datasheet4u.com
stability over applicable temperature ranges. The output
voltage can be set to any value between VREF
(approximately 2.5 V) to 18V with two external resistors.
This device has a typical output impedance of 0.2Ω.
Active output circuitry provides a very sharp turn on
characteristic, making this device excellent replacement
for Zener diodes in many applications.
The SE431 is characterized for operation from 0oC
to 105oC, and five package options (SOT-23-3, SOT-23-5,
SOP-8, TO-92 and SOT-89) allow the designer the
opportunity to select the proper package for their
applications.
Features
¾ Low voltage operation (2.5V)
¾ Adjustable output voltage V0 = VREF to 18V
¾ Wide operating current range 120µA to 100mA
¾ Low dynamic output impedance 0.2Ω (Typ.).
¾ Trimmed bandgap design up to + 0.5%.
¾ ESD rating is 5.5KV(Per MIL-STD-883D).
¾ Available in Lead Free Packages.
Application
¾ Linear Regulators
¾ Adjustable Supplies
¾ Switching Power Supplies
¾ Battery Operated Computers
¾ Instrumentation
¾ Computer Disk Drives
Block Diagram
Cathode
Ref
+
-
Symbol Diagram
Cathode
Vref Ref
Anode
Anode
All contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com • Page 1
1 page  
SEAWARD
ELECTRONICS
Test Circuits
Input
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V KA
I KA
Vref
Adjustable Precision
Shunt Regulator
Input
R1
Iref
R2 Vref
VKA
I KA
Input
VKA = Vref (1+RR12) + Iref x R1
SE431
VKA
I off
Test Circuit 1:
VKA = VREF
Application Diagram
VIN R
Test Circuit 2:
VKA > VREF
VOUT
R1
Vref
R2
SE431
Test Circuit 3:
Off State Current
VOUT = Vref (1+RR12 )
GND
Thermal Consideration
Package
Power Rating
Power Rating
Power Rating
SOT-23-3 (θJA=230°C/W)
SOT-23-5L (θJA=230°C/W)
TO-92 (θJA=220°C/W)
(TA=25°C)
435mW
435mW
455mW
(TA=50°C)
326mW
326mW
341mW
(TA=70°C)
239mW
239mW
250mW
1. Maximum junction temperature is 125°C
2. θJA is measured with packages mounted onboard under still-air condition with 1W power applied.
3. Power rating is calculated using PD = (TJ – TA) /θJA, where TJ denotes junction temperature and TA denotes ambient temperature.
All contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com • Page 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SE431.PDF ] | |
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