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| ADJUSTABLE PRECISION ZENER SHUNT REGULATOR Issue 1 - NOVEMBER 1998 DEVICE DESCRIPTION The ZR431L is a three terminal adjustable s h u n t r e g u l a t o r o f f e r i n g e x c e l l e nt temperature stability and output current handling capability 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. The devices can be used as a replacement for zener diodes in many applications r e q u i r i n g a n i m p r ov e me nt i n z e n e r performance. 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. ZR431L FEATURES * * * * * * * * * * * * * Surface mount SOT23 package TO92 package 2.5% and 1% tolerance Maximum temperature coefficient 50 ppm/C Temperature compensated for operation over the full temperature range Programmable output voltage 100A to 25mA 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 Vref Gnd ZR431L ABSOLUTE MAXIMUM RATING Cathode Voltage (VZ) 10V Cathode Current 50mA Operating Temperature -40 to 85C Storage Temperature -55 to 125C Recommended Operating Conditions Min Max Cathode Voltage VREF 10V Cathode Current 100A 25mA Power Dissipation (Tamb=25C, Tjmax=150C) SOT23 330mW TO92 600mW ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):Tamb=25C VALUE PARAMETER Reference Voltage SYMBOL MIN 2.5% Vref 1.0% Vdev TYP MAX UNITS CONDITIONS 1.271 1.252 8.0 V mV IL=10mA (Fig1), VZ=Vref IL=10mA, VZ=Vref Ta=full range (Fig1) 1.209 1.24 1.228 1.24 4.0 Deviation of Reference Input Voltage over Temperature Ratio of the change in Reference Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Input Current over Temperature Minimum Cathode Current for Regulation Off-state Current Dynamic Output Impedance Vref VZ 0.5 2.0 mV/V VZ from Vref to 10V IZ=10mA (Fig2) Iref Iref 0.02 0.11 0.02 0.4 0.2 A A R1=10k,R2=O/C,lL=10mA(Fig2) R1=10k, R2=O/C, IL=10mA Ta=full range (Fig2) IZmin IZoff RZ 30 10 0.25 100 30 2 A A VZ=10V, Vref =0V (Fig3) VZ=Vref (Fig1), f=0Hz, IL=10mA Deviation of reference input voltage, Vdev, is defined as the maximum variation of the reference input voltage over the full temperature range. The average temperature coefficient of the reference input voltage, Vref is defined as: Vmax Vdev x 1000000 Vref (ppm C)= Vref (T1-T2) The dynamic output impedance, Rz, is defined Vmin VZ RZ = as: IZ When the device is programmed with two Vdev = Vmax - Vmin external resistors, R1 and R2, (fig 2) , the dynamic output impedance of the overall circuit, R', is defined as: R1 R'=Rz (1+ ) T1 T2 R2 Temperature ZR431L CONNECTION DIAGRAMS SOT23 Package Suffix - F TO92 Package Suffix - C Top View Bottom View ORDERING INFORMATION Part Number ZR431LF02 ZR431LF01 ZR431LC02 ZR431LC01 Package Tol % SOT23 SOT23 TO92 TO92 2.5 1 2.5 1 Part Mark 43L 43M ZR431L02 ZR431L01 ZR431L TYPICAL CHARACTERISTICS 140 Vref = Vz 0 Iz= 10mA 130 120 110 100 90 80 -40 -1 -2 -3 -4 -5 -6 -7 -8 -9 Iz 10mA -20 0 20 40 60 80 0 2 4 6 8 10 12 Temperature ( C) Cathode Voltage (V) Reference Current v Temperature 26 Vref = Vz Change in Vref v Cathode Voltage 100 Vref = Vz 1mA 24 22 20 18 16 14 -40 0.1 100 1 10 10mA -20 0 20 40 60 80 1k 10k 100k Temperature ( C) Frequency (Hz) Cathode Current v Temperature Dynamic Impedance v Frequency 1.244 1.242 1.240 1.238 1.236 Iz= 10mA 1.0 TO92 SOT23 1.234 1.232 -40 0 -20 0 20 40 60 80 25 50 75 85 100 Temperature ( C) Ambient Temprature ( C) Reference Voltage v Temperature Power Dissipation Derating ZR431L DC TEST CIRCUITS Input IL VZ Input IL VZ Input VZ IHAB IZ 47nF R1 IHAB IZ 47nF I zoff 47nF Vref R2 Vref Fig 1 - Test Circuit for Vz=Vref Fig 2 - Test Circuit for Vz>Vref Fig 3 - Test Circuit for Off State current 1-42 ZR431L APPLICATION CIRCUITS V+ Vout V+ Vout R1 Vref Vref R2 R1 R2 Vout = 1+ R1 R2 Vref Vout = 1+ R1 R2 Vref SHUNT REGULATOR HIGHER CURRENT SHUNT REGULATOR V+ ZSR*** In Common Out V+ Vout 30 R1 0.01F Vref R1 R2 Vref R2 Vout Vout MIN = Vref + Vreg Vout = 1+ R1 R2 OUTPUT CONTROL OF A THREE TERMINAL FIXED REGULATOR Vref Vout = 1+ R1 R2 SERIES REGULATOR Vref V+ V+ OUTPUT INPUT V on V TH = 2.5V 2V R1A R1B Vref OUTPUT Vref R2A R2B V off = V+ Low limit = 1+ R1B R2B Vref High limit = 1+ R1A R2A Vref SINGLE SUPPLY COMPARATOR WITH TEMPERATURE COMPENSATED THRESHOLD OVER VOLTAGE / UNDER VOLTAGE PROTECTION CIRCUIT ZR431L TYPICAL CHARACTERISTICS 60 Iz =10mA VZ 47k 10. 1Z 50 40 30 20 10 0 100 " + 47k - 1k 10k 100k IZ = 10mA, TA = 25C Frequency (Hz) Gain v Frequency Test Circuit for Open Loop Voltage Gain 120 VZ Input Monitor 2.0 Repetitive Pulse Vz 1.0 Single Pulse Pulse Generator 50 0 5.0 2.5 0 0 100 200 300 400 500 INPUT TA = 25C Test Circuit for Pulse Response Time (s) Pulse Response Vref < VZ < 10, IZ = 10mA, TA = 25C 30 25 1Z Input 150 8Z 20 STABLE UNSTABLE STABLE 10k 15 10 5 0 10p 100F 100p 1n 10n .1 1 10 Load Capacitance(F) Stability Boundary Conditions Test Circuit for Stability Boundary Conditions |
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