ZH431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR Issue 2 - February 1998 DEVICE DESCRIPTION The ZH431 is a three terminal adjustable s hu n t r e g u l a t or o f f e r i n g e xc el l e nt temperature stability and output current handling capability up to 30mA. The output voltage may be set to any chosen voltage between 2.5 and 36 volts by selection of two external divider resistors. The devices can be used as a replacement for zener diodes in many applications r e qu i r i n g a n i mpr o ve me nt i n z e ner performance.They are also ideal for use in the feedback circuits of off line SMPUs as well as many general purpose regulator and reference applications where initial accuracy and low temperature coefficient are key requirements. Note: ZH431 is not recommended for new designs. Refer to ZR431 ZH431 FEATURES Surface mount SO8, SOT223,SOT23 and SOT89 packages TO92 package 2% and 1% tolerance Maximum temperature coefficient 55 ppm/°C Temperature compensated for operation over the full temperature range Programmable output voltage 50µA to 30mA current sink capability Low output noise APPLICATIONS Shunt regulator Series regulator Voltage monitor Over voltage/ under voltage protection Switch mode power supplies SCHEMATIC DIAGRAM VZ V ref Gnd 4-15 ZH431 ABSOLUTE MAXIMUM RATING Cathode Voltage (VZ) 40V Cathode Current 50mA Operating Temperature -40 to 85°C Storage Temperature -55 to 125°C Recommended Operating Conditions Min Max Cathode Voltage Vref ...