ZR431LC01 Diodes Incorporated

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 1 REF The devices can be used as a replacement for zener diodes in many 3 GND applications requiring an improvement in zener performance. V 2 Z 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 100A 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 ZR431L Typical Applications Circuit (cont.) V+ ZSR*** V V+ OUT IN OUT 30 Common R1 0.01F V REF R1 R2 V V OUT REF R2 V = V + V OUT(MIN) REF REG R1 R1 1 1 V V V V OUT REF OUT REF R2 R2 SERIES REGULATOR OUTPUT CONTROL OF A THREE TERMINAL FIXED REGULATOR V+ V+ R1A R1B V REF OUTPUT OUTPUT V REF INPUT V 2V ON R2B R2A V = V+ OFF V = 2.5V TH R1B Lowlimit 1 V REF R2B R1A Highlimit 1 V REF R2A SINGLE SUPPLY COMPARATOR WITH TEMPERATURE COMPENSATED THRESHOLD OVER VOLTAGE/UNDER VOLTAGE PROTECTION CIRCUIT Functional Block Diagram V Z GND 2 of 9 ZR431L April 2015 Diodes Incorporated www.diodes.com Document number: DS33256 Rev. 4 - 2