Datasheet ZR431L (Diodes)

ZR431L ADJUSTABLE PRECISION SHUNT REGULATOR Description Pin Assignments
The ZR431L is a three terminal adjustable shunt regulator offering excellent temperature stability and output current handling capability
(Top View)
up to 25mA. The output voltage may be set to any chosen voltage between 1.24 and 10 volts by selection of two external divider resistors. V REF 1 The devices can be used as a replacement for zener diodes in many 3 GND applications requiring an improvement in zener performance. V Z 2 The ZR431L is particularly used in the feedback control loop of switch mode power supplies. In this application the device 1.24 volt reference enables the generation of low voltage supplies, typically 3.3 volts or 3 volts.
SOT23 Features
2.5% and 1% Tolerance Max. Temperature Coefficient 50ppm/°C
Applications
Temperature Compensated for Operation over The Full Shunt Regulator Temperature Range Series Regulator Programmable Output Voltage Voltage Monitor 100μA to 100mA Current Sink Capability Over Voltage/ Under Voltage Protection Surface Mount SOT23 Package Switch Mode Power Supplies
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3)
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds.
Typical Applications Circuit
V+

V V+ OUT

VOUT

R1

R1

V

REF V

REF

R2 R2

 1 R 

 1 R 

V  1 OUT   VREF V  1 OUT   V  2 R  REF  2 R 
SHUNT REGULATOR HIGHER CURRENT SHUNT REGULATOR
ZR431L 1 of 9 April 2015 Document number: DS33256 Rev. 4 - 2
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