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| ADJUSTABLE PRECISION ZENER SHUNT REGULATOR ISSUE 5 - DECEMBER 2002 DEVICE DESCRIPTION The ZR431 is a three terminal adjustable shunt regulator offering excellent temperature stability and output current handling capability up to 100mA. The output voltage may be set to any chosen voltage between 2.5 and 20 volts by selection of two external divider resistors. The devices can be used as a replacement for zener diodes in many applications requiring an improvement in zener performance. ZR431 FEATURES * * * * * * * * * * * * * Surface mount SOT223 and SOT23 packages TO92 package 2%, 1 % and 0.5% tolerance Max. temperature coefficient 55 ppm/C Temperature compensated for operation over the full temperature range Programmable output voltage 50A to 100mA 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 4-189 78 ZR431 ABSOLUTE MAXIMUM RATING Cathode Voltage (VZ) 20V Cathode Current 150mA Operating Temperature -40 to 85C Storage Temperature -55 to 125C Recommended Operating Conditions Min Max Cathode Voltage Vref 20V Cathode Current 50A 100mA Power Dissipation (Tamb=25C,Tjmax=150C) SOT23 330mW TO92 780mW SOT223 2W ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):Tamb=25C PARAMETER Reference Voltage SYMBOL VALUE MIN TYP MAX UNITS CONDITIONS 2.45 2.50 2.55 V 2.475 2.50 2.525 2.487 2.50 2.513 8.0 17 mV mV/V mV/V A A IL=10mA (Fig1), VZ=Vref 2% Vref 1% (1) 0.5% Deviation of Reference Input Vdev 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 Vref VZ IL=10mA, VZ=Vref Ta=full range (Fig1) VZ from Vref to 10V IZ=10mA (Fig2) VZ from 10V to 20V IZ=10mA (Fig2) R1=10k, R2=O/C, lL=10mA (Fig2) R1=10k, R2=O/C, IL=10mA Ta=full range (Fig2) VZ=Vref (Fig1) VZ=20V, Vref =0V (Fig3) VZ=Vref (Fig1), f=0Hz -1.85 -2.7 -1.0 -2.0 Iref Iref 0.12 1.0 0.04 0.2 IZmin IZoff 35 50 0.1 A A Dynamic Output Impedance RZ (1) 0.75 0.5% SOT23 only. For definitions of reference voltage temperature coefficient and dynamic output impedance see NOTES following DC TEST CIRCUITS 4-190 78 ZR431 TYPICAL CHARACTERISTICS 160 150 140 130 120 110 100 -40 Vref=VZ IZ=10mA Change in Reference Output Voltage (mV) 0 IZ=10mA Reference Current (nA) -5 -10 -15 -20 -25 0 5 10 15 20 -20 0 20 40 60 80 Temperature (C) Cathode Voltage (V) Reference Current v Temperature 38 36 34 32 30 28 26 24 -40 Change in Vref v Cathode Voltage 100 Minimum Cathode Current ( m A) Vref=VZ Vref=VZ 1mA Dynamic Impedance (W ) 10 10mA 1.0 -20 0 20 40 60 80 0.1 100 1k 10k 100k 1M Temperature (C) Frequency (Hz) Cathode Current v Temperature 2.506 IZ=10mA 2.504 Dynamic Impedance v Frequency Reference Voltage (V) SOT223 2.502 2.500 2.498 2.496 2.494 2.492 2.490 -40 TO92 SOT23 -20 0 20 40 60 80 Temperature (C) Reference Voltage v Temperature 4-191 78 4-191 78 ZR431 TYPICAL CHARACTERISTICS 60 Open Loop Voltage Gain (dB) VZ 40 9F 15k IZ 230 20 8k25 + - 0 100 1k 10k 100k 1M Frequency (Hz) IZ = 10mA, TA = 25C Gain v Frequency Test Circuit for Open Loop Voltage Gain 220 3.0 Repetitive pulse Input Monitor V Z Voltage Swing (V) 2.0 Single pulse 1.0 VZ Pulse Generator 50 0 5.0 0 0 0.2 0.4 INPUT 0.6 0.8 1.0 Time (s) TA = 25C Pulse Response 100 Test Circuit for Pulse Response Input 150 VZ Cathode Current (mA) 80 STABLE 60 STABLE IZ 10k 40 20 0 10p 100p 1000p 0.01 0.1 1 Load Capacitance (F) Vref < VZ < 20, IZ = 10mA, TA = 25C Stability Boundary Conditions Test Circuit for Stability Boundary Conditions 4-192 78 ZR431 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 Out Common 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 4-193 78 ZR431 DC TEST CIRCUITS IL Input Input VZ I zoff Fig 1 - Test Circuit for Vz=Vref Fig 2 - Test Circuit for Vz>Vref Fig 3 - Test Circuit for Off State current NOTES 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 Vmin Vref (T1-T2) The dynamic output impedance, Rz, is defined as: VZ RZ = IZ Vdev = Vmax - Vmin Vref (ppm C)= Vdev x 1000000 When the device is programmed with two external resistors, R1 and R2, (fig 2) , the dynamic output impedance of the overall circuit, R', is defined as: R1 R'=Rz (1+ ) R2 4-194 78 ZR431 CONNECTION DIAGRAMS TO92 Package Suffix - C SOT223 Package Suffix - G Bottom View Top View - Pin 4 floating or connected to pin 2 SOT23 Package Suffix - F Top View ORDERING INFORMATION Part Number ZR431C01 ZR431C ZR431G01 ZR431G ZR431F005 ZR431F01 ZR431F Package TO92 TO92 SOT223 SOT223 SOT23 SOT23 SOT23 Tol. % 1.0 2.0 1.0 2.0 0.5 1.0 2.0 Part Mark ZR43101 ZR431 ZR43101 ZR431 43R 43B 43A 4-195 78 |
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