A Product Line of
Diodes Incorporated
ZHT431
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
Description
The ZHT431 is a three terminal adjustable shunt regulator offering excellent temperature stability and output current handling capability up to 100mA. The device offers extended operating temperature range working from -55 to +125°C.
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.
Features
•Surface mount SOT23 package
•0.5%, 1% and 2% tolerance
•Maximum temperature coefficient 67ppm/°C
•Temperature compensated for operation over the full temperature range
•Programmable output voltage
•50μA to 100mA current sink capability
•Low output noise
•Available in “Green” Molding Compound (See page 7)
•Wide temperature range -55 to +125°C
Pin Assignments
SOT23
VZ
GND
VREF
(Top View)
Applications
•Series and shunt regulator
•Voltage monitor
•Over voltage / under voltage protection
•Switch mode power supplies
Typical Application Circuit
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ZHT431 |
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1 of 8 |
November 2010 |
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Document number: DS32157 Rev. 11 - 2 |
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www.diodes.com |
© Diodes Incorporated |
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A Product Line of |
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Diodes Incorporated |
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ZHT431 |
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Absolute Maximum Ratings (Voltages to GND Unless Otherwise Stated) |
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Parameter |
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Rating |
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Unit |
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Cathode Voltage (VZ) |
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20 |
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V |
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Cathode Current |
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150 |
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mA |
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Operating Temperature |
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-55 to 125 |
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°C |
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Storage Temperature |
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-55 to 150 |
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°C |
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Power Dissipation |
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330 |
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mW |
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(Tamb = 25°C, TJMAX = 150°C) |
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Recommended Operating Conditions |
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Parameter |
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Min |
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Max |
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Units |
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Cathode Voltage VREF |
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20 |
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V |
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Cathode Current |
0.05 |
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100 |
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mA |
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Electrical Characteristics |
(Test conditions unless otherwise specified: Tamb = 25°C) |
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Symbol |
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Parameter |
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Values |
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Units |
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Conditions |
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Min. |
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Typ. |
Max. |
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VREF |
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Reference Voltage |
2% |
2.45 |
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2.50 |
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2.55 |
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IL=10mA (Fig.1), |
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1% |
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2.475 |
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2.50 |
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2.525 |
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V |
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VZ=VREF |
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0.5% |
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2.4875 |
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2.50 |
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2.5125 |
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VDEV |
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Deviation of reference input voltage |
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10 |
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30 |
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IL=10mA, VZ=VREF |
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over temperature |
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Tamb=full range (Fig1) |
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VREF |
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Ratio of the change in reference voltage |
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-1.85 |
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-2.7 |
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mV/V |
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VZ from VREF to 10V |
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VZ |
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to the change in cathode voltage |
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IZ=10mA (Fig.2) |
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-1.0 |
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-2. |
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mV/V |
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VZ from 10V to 20V |
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IZ=10mA (Fig.2) |
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IREF |
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Reference input current |
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0.12 |
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1.0 |
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µA |
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R1=10k, R2=O/C, |
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lL=10mA (Fig.2) |
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IREF |
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Deviation of reference input current |
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0.04 |
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0.2 |
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µA |
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R1=10k, R2=O/C, |
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IL=10mA Tamb=full range |
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over temperature |
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(Fig.2) |
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IZmin |
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Minimum cathode current for regulation |
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35 |
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50 |
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µA |
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VZ=VREF (Fig.1) |
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IZoff |
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Off-state current |
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0.1 |
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VZ=20V, VREF=0V(Fig.3) |
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RZ |
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Dynamic output impedance |
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0.75 |
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VZ=VREF (Fig.1), f=0Hz, |
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IC=1mA to 100mA |
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:
The dynamic output impedance, RZ, is defined as:
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:
ZHT431 |
2 of 8 |
November 2010 |
Document number: DS32157 Rev. 11 - 2 |
www.diodes.com |
© Diodes Incorporated |
Typical Operating Conditions
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170 |
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(nA) |
150 |
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Current |
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Reference |
130 |
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120 |
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-25 |
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25 |
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75 |
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100 |
125 |
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-50 |
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Temperature (°C) |
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40 |
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I |
R EF |
vs. Temperature |
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|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
|
(µA) |
38 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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||
36 |
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|
|
|
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|
||
Current |
34 |
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Cathode |
32 |
|
|
|
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|
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|
|
|
|
|
|
Minimum |
30 |
|
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|
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||
28 |
|
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|
26 |
|
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|
|
|
24 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
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|
|
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|
|
|
|
|
|
-25 |
|
0 |
|
25 |
|
50 |
|
75 |
|
100 |
125 |
|
|||||||||||
|
-50 |
|
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|
|
|
||||||||||||||||||||||
|
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|
|
|
|
|
Temperature (°C) |
|
|
|
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|
|
|
||||||||||
|
|
|
|
|
|
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|
|
|
|
I |
|
|
|
vs. Temperature |
|
|
|
|
|
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|
||||||||
|
2.502 |
|
|
|
|
|
|
|
|
Z MIN |
|
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|
||||
|
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|
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||
|
2.500 |
|
|
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|
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||
|
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|
|||
(V) |
2.498 |
|
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||
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||||
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|
|
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|
|
|
|
|
|
|
|
Voltage |
2.496 |
|
|
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||
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|
|
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|
|||
Reference |
2.494 |
|
|
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||
|
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|
||||
2.492 |
|
|
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|||
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|
|||
|
2.490 |
|
|
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||
|
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|
|
|
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|
|
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|
|||
|
2.488 |
|
|
|
|
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|
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|
|
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|
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||
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|
|
|
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|
|
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|
|||
|
2.486 |
|
|
|
|
|
|
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|
|
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|
|
|
|
|
|
|
|
|
|
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|
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|
||
|
|
|
|
|
-25 |
0 |
25 |
50 |
75 |
100 |
125 |
|
||||||||||||||||||
|
-50 |
|
Temperature (°C)
VREF vs. Temperature
A Product Line of
Diodes Incorporated
ZHT431
|
0 |
|
|
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|
I |
= 10mA |
|
|||||||||||
(mV) |
|
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|
|
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|
Z |
|
|
|
|
|
|
|
|
|
|
|
|
|
-5 |
|
|
|
|
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|
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|
|
|
|
|
|
Voltage |
|
|
|
|
|
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|
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|
|
|
|
|
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|
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|
|
|
|
|
|
Output |
-10 |
|
|
|
|
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|
|
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|
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|
|
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|
|
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|
|
|
|
|
|
|
Referencein |
-15 |
|
|
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|
|
|
|
|
|
Change |
-20 |
|
|
|
|
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|
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|
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||
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|
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|
|
|
|
-250 |
|
|
|
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|
|
|
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|
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|
|
5 |
10 |
|
15 |
20 |
||||||||||||||||||||||||||||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
Cathode Voltage (V) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||||||||||||||
|
|
|
|
|
|
Change in V vs. Cathode Voltage |
|||||||||||||||||||||||||||||||||||||
|
100 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
REF |
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|||||||
|
|
|
VREF = VZ |
|
|
|
|
|
|
|
|
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|
|
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|
||||||
|
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|
|
|
|
|||||||
Ω) |
10 |
|
|
|
|
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|
|
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|
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|
|
|
|
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|
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|
|
|
|
|
|
1mA |
|
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|
||||
|
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||||||||
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||
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||
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||
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||
( |
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|
Impedance |
|
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|
10mA |
|
|
|
|
|
|
||||||
Dynamic |
1.0 |
|
|
|
|
|
|
|
|
|
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|
|||||||
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||
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||
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||
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||
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|
0.1 |
|
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100 |
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1K |
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10K |
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100K |
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1M |
Frequency (Hz)
Dynamic Impedance vs. Frequency
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0.5 |
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0.4 |
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(W) |
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Dissipation |
0.3 |
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0.2 |
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Power |
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0.1 |
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0 0 |
25 |
50 |
75 |
100 |
125 |
150 |
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Ambient Temperature (°C) |
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Power Dissipation Derating |
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ZHT431 |
3 of 8 |
November 2010 |
Document number: DS32157 Rev. 11 - 2 |
www.diodes.com |
© Diodes Incorporated |