Zetex ZR431C, ZR431C01, ZR431F, ZR431F005, ZR431F01 Datasheet
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ADJUSTABLE PRECISION |
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ZR431 |
ZENER SHUNT REGULATOR |
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ISSUE 4 – SEPTEMBER 2000 |
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DEVICE DESCRIPTION |
FEATURES |
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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.
Surface mount SO8, 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
50 A 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
ZR431
ABSOLUTE MAXIMUM RATING
Cathode Voltage (VZ) |
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20V |
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Power Dissipation (Tamb=25°C,Tjmax=150°C) |
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Cathode Current |
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150mA |
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SOT23 |
330mW |
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Operating Temperature |
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-40 to 85°C |
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TO92 |
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780mW |
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Storage Temperature |
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-55 to 125°C |
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SOT223 |
2W |
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Recommended Operating Conditions |
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SO8 |
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780mW |
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Min |
Max |
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Cathode Voltage |
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Vref |
20V |
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Cathode Current |
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50 A |
100mA |
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ELECTRICAL CHARACTERISTICSTEST CONDITIONS (Unless otherwise stated):Tamb=25°C |
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SYMBOL |
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VALUE |
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PARAMETER |
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UNITS |
CONDITIONS |
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MIN |
TYP |
MAX |
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Reference Voltage |
2% |
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Vref |
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2.45 |
2.50 |
2.55 |
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V |
IL=10mA (Fig1), VZ=Vref |
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1% |
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2.475 |
2.50 |
2.525 |
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(1)0.5% |
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2.489 |
2.50 |
2.513 |
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Deviation of Reference Input |
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Vdev |
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8.0 |
17 |
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mV |
IL=10mA, VZ=Vref |
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Voltage over Temperature |
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Ta=full range (Fig1) |
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Ratio of the change in |
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Vref |
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-1.85 |
-2.7 |
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mV/V |
VZ from Vref to 10V |
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Reference Voltage to the |
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IZ=10mA (Fig2) |
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V |
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Change in Cathode |
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Z |
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-1.0 |
-2.0 |
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mV/V |
VZ from 10V to 20V |
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Voltage |
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IZ=10mA (Fig2) |
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Reference Input Current |
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Iref |
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0.12 |
1.0 |
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A |
R1=10k, R2=O/C, lL=10mA |
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(Fig2) |
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Deviation of Reference |
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Iref |
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0.04 |
0.2 |
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A |
R1=10k, R2=O/C, IL=10mA |
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Input Current over |
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Ta=full range (Fig2) |
Temperature |
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Minimum Cathode |
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IZmin |
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35 |
50 |
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A |
VZ=Vref (Fig1) |
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Current for Regulation |
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Off-state Current |
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IZoff |
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0.1 |
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A |
VZ=20V, Vref =0V (Fig3) |
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Dynamic Output Impedance |
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RZ |
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0.75 |
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VZ=Vref (Fig1), f=0Hz |
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(1) 0.5% SOT23 only. |
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For definitions of reference voltage temperature coefficient and dynamic output impedance see NOTES following DC TEST CIRCUITS
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ZR431 |
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TYPICAL CHARACTERISTICS |
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160 |
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Vref=VZ |
(mV) |
0 |
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IZ=10mA |
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(nA)CurrentReference |
150 |
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IZ=10mA |
VoltageOutputReference |
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-5 |
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140 |
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-10 |
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130 |
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-15 |
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120 |
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110 |
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-20 |
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100 |
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in |
-25 |
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-40 |
-20 |
0 |
20 40 |
60 80 |
Change |
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5 |
10 |
15 |
20 |
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Temperature (°C) |
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Cathode Voltage (V) |
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Reference Current v Temperature |
Change in Vref v Cathode Voltage |
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38 |
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Vref=VZ |
100 |
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A) |
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Vref=VZ |
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36 |
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1mA |
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MinimumCathode Current( |
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34 |
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10 |
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32 |
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10mA |
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30 |
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28 |
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1.0 |
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ImpedanceDynamic)( |
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26 |
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24 |
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0.1 |
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-40 |
-20 |
0 |
20 |
40 |
60 |
80 |
100 |
1k |
10k |
100k |
1M |
Temperature (°C) |
Frequency (Hz) |
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Cathode Current v Temperature |
Dynamic Impedance v Frequency |
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2.506 |
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IZ=10mA |
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2.504 |
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SOT223 |
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(V) |
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2.502 |
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Voltage |
2.500 |
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2.498 |
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Reference |
2.496 |
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SO8/TO92 |
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2.494 |
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SOT23 |
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2.492 |
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2.490 |
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-40 |
-20 |
0 |
20 |
40 |
60 |
80 |
Temperature (°C)
Reference Voltage v Temperature
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