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| ADJUSTABLE PRECISION ZENER SHUNT REGULATOR ISSUE 3 DECEMBER 1997 DEVICE DESCRIPTION The ZR2431 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 25mA. The output voltage may be set to any chosen voltage between 1.24 and 15 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. The ZR2431 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. ZR2431 FEATURES * * * * * * * * * * * * * Surface mount SOT23, SOT223, SOT89 and SO8 packages TO92 package 2.5% and 1% tolerance Maximum temperature coefficient 52 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 4-154 ZR2431 ABSOLUTE MAXIMUM RATING Cathode Voltage (VZ) 15V Cathode Current 50mA Operating Temperature -40 to 85C Storage Temperature -55 to 125C Recommended Operating Conditions Min Max Cathode Voltage VREF 15V Cathode Current 100A 25mA Power Dissipation (Tamb=25C, Tjmax=150C) SOT23 330mW SOT223 2W SO8 780mW TO92 780mW SOT89 1.5W ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):Tamb=25C PARAMETER Reference Voltage VALUE SYMBOL MIN TYP MAX UNITS CONDITIONS 2.5% Vref 1.0% 1.209 1.24 1.271 V 1.228 1.24 1.252 4.0 0.5 8.0 2.0 mV mV/V IL=10mA (Fig1), VZ=Vref IL=10mA, VZ=Vref Ta=full range (Fig1) VZ from Vref to 10V IZ=10mA (Fig2) R1=10k, R2=O/C, lL=10mA (Fig2) R1=10k, R2=O/C, IL=10mA Ta=full range (Fig2) VZ=15V, Vref =0V (Fig3) VZ=Vref (Fig1), f=0Hz, IL=10mA Deviation of Reference Input Vdev Voltage over Temperature Ratio of the change in Vref Reference Voltage to the VZ Change in Cathode Voltage Reference Input Current Iref Deviation of Reference Input Iref Current over Temperature Minimum Cathode Current for Regulation Off-state Current IZmin IZoff 0.02 0.11 0.4 0.02 0.2 30 10 100 30 A A A A Dynamic Output Impedance RZ 0.25 2 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 VZ defined as: RZ = IZ Vmin When the device is programmed with two external resistors, R1 and R2, (fig 2) , the dynamic output impedance of the overall Vdev = Vmax - Vmin circuit, R', is defined as: R1 R'=Rz (1+ ) R2 With a capacitance of greater than 100pF between cathode and anode, minimum cathode current must be 0.2mA. T1 Temperature T2 4-155 ZR2431 TYPICAL CHARACTERISTICS TYPICAL CHARACTERISTICS Change in Reference Output Voltage(mV) 140 Vref = Vz 2 Iz = 10mA 130 Iz=10mA 1 0 -1 -2 -3 -4 -5 0 5 10 15 Reference Current (nA) 120 110 100 90 80 -40 -20 0 20 40 60 80 Temperature (C) Cathode Voltage (V) Reference Current v Temperature Minimum Cathode Current(A) 26 Vref = Vz Change in Vref v Cathode Voltage 10 Vref = Vz 1mA 24 22 20 18 16 14 -40 Dynamic Impedance () 10mA 1 -20 0 20 40 60 80 0.1 100 1k 10k 100k Temperature (C) Frequency (Hz) Cathode Current v Temperature Dynamic Impedance v Frequency 1.244 2.0 Reference Voltage (V) 1.240 1.238 1.236 1.234 1.232 -40 Power Dissipation (W) 1.242 Iz=10mA SOT 89 SOT 223 1.0 SO8/TO92 SOT23 0 -20 0 20 40 60 80 25 50 75 85 100 Temperature (C) Ambient Temprature (C) Reference Voltage v Temperature Power Dissipation Derating 4-156 TYPICAL CHARACTERISTICS 60 Iz = 10mA ZR2431 VZ Open Loop Voltage Gain (dB) 50 40 30 20 10F 47k IZ 240 + 47k - 10 0 100 1k 10k 100k 1M Frequency (Hz) IZ = 10mA, TA = 25C Gain v Frequency Test Circuit for Open Loop Voltage Gain 120 2.0 Single Pulse Input Monitor V Z Voltage Swing (V) Vz 1.0 Repetitive Pulse 0 5.0 2.5 INPUT Pulse Generator 50 0 TA = 25C 0 100 200 300 400 500 Time (us) Test Circuit for Pulse Response Pulse Response Vref < VZ < 20, IZ = 10mA, TA = 25C 30 Input STABLE 150 VZ Cathode Current(mA) 25 20 15 STABLE IZ 10k 10 5 0 10p UNSTABLE 100F 100p 1n 10n .1 1 10 Load Capacitance(F) Stablity Boundary Conditions Test Circuit for Stability Boundary Conditions 4-157 ZR2431 DC TEST CIRCUITS Input IL VZ Input IL VZ Input VZ IZ Iref 1F R1 IZ Iref 1F I zoff 1F 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 4-158 ZR2431 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 4-159 ZR2431 CONNECTION DIAGRAMS SO8 Package Suffix - N8 SOT223 Package Suffix - G Top View Top View - Pin 4 floating or connected to pin 2 SOT23 Package Suffix - F TO92 Package Suffix - C Top View Bottom View SOT89 Package Suffix - Z ORDERING INFORMATION Part Number ZR2431N802 ZR2431N801 ZR2431G02 ZR2431G01 ZR2431F02 ZR2431F01 ZR2431Z02 ZR2431Z01 ZR2431C02 ZR2431C01 Package SO8 SO8 SOT223 SOT223 SOT23 SOT23 SOT89 SOT89 TO92 TO92 Tol % 2.5 1 2.5 1 2.5 1 2.5 1 2.5 1 Part Mark ZR243102 ZR243101 ZR243102 ZR243101 24D 24E 24D 24E ZR243102 ZR243101 Top View 4-160 |
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