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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 +125C. 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.
Pin Assignments
SOT23
VZ
GND
VREF
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 50A to 100mA current sink capability Low output noise Available in "Green" Molding Compound (See page 7) Wide temperature range -55 to +125C
(Top View)
Applications
* * * * Series and shunt regulator Voltage monitor Over voltage / under voltage protection Switch mode power supplies
Typical Application Circuit
ZHT431
Document number: DS32157 Rev. 11 - 2
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ZHT431 Absolute Maximum Ratings (Voltages to GND Unless Otherwise Stated)
Parameter Cathode Voltage (VZ) Cathode Current Operating Temperature Storage Temperature Power Dissipation (Tamb = 25C, TJMAX = 150C) Rating 20 150 -55 to 125 -55 to 150 330 Unit V mA C C mW
Recommended Operating Conditions
Parameter Cathode Voltage VREF Cathode Current Min 0.05 Max 20 100 Units V mA
Electrical Characteristics
Symbol VREF VDEV VREF VZ Reference Voltage
(Test conditions unless otherwise specified: Tamb = 25C)
Parameter 2% 1% 0.5%
Min. 2.45 2.475 2.4875
Values Typ. 2.50 2.50 2.50 10 -1.85 -1.0
Max. 2.55 2.525 2.5125 30 -2.7 -2. 1.0 0.2 50 0.1 0.75
Units V mV mV/V mV/V A A A A V
Conditions IL=10mA (Fig.1), VZ=VREF IL=10mA, VZ=VREF Tamb=full range (Fig1) VZ from VREF to 10V IZ=10mA (Fig.2) VZ from 10V to 20V IZ=10mA (Fig.2) R1=10k, R2=O/C, lL=10mA (Fig.2) R1=10k, R2=O/C, IL=10mA Tamb=full range (Fig.2) VZ=VREF (Fig.1) VZ=20V, VREF=0V(Fig.3) VZ=VREF (Fig.1), f=0Hz, IC=1mA to 100mA
Deviation of reference input voltage over temperature Ratio of the change in reference voltage to the change in cathode voltage
IREF IREF
Reference input current Deviation of reference input current over temperature Minimum cathode current for regulation Off-state current Dynamic output impedance
0.12 0.04 35
IZmin IZoff RZ
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
Document number: DS32157 Rev. 11 - 2
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A Product Line of Diodes Incorporated
ZHT431 Typical Operating Conditions
170 160
Reference Current (nA)
0
IZ = 10mA
Change in Reference Output Voltage (mV)
-5
150 140 130 120 110 100 90
-10
-15
-20
-50
-25
0 25 50 75 100 125 Temperature (C) IR EF vs. Temperature
-25 0
10 15 Cathode Voltage (V) Change in VREF vs. Cathode Voltage
V REF = V Z
5
20
40 38
100
1mA
Minimum Cathode Current (A)
Dynamic Impedance ( )
36 34 32 30 28 26 24
10
10mA
1.0
-50
-25
0 25 50 75 100 125 Temperature (C) IZ MIN vs. Temperature
0.1 100
10K 100K Frequency (Hz) Dynamic Impedance vs. Frequency
1K
1M
2.502 2.500
0.5
0.4
2.498
Reference Voltage (V)
2.496 2.494 2.492 2.490
Power Dissipation (W)
-50 -25 0 25 50 75 100 125 Temperature ( C) V REF vs. Temperature
0.3
0.2
0.1
2.488 2.486
0
0
25
50 75 100 125 Ambient Temperature (C) Power Dissipation Derating
150
ZHT431
Document number: DS32157 Rev. 11 - 2
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ZHT431 Typical Operating Conditions (Cont.)
60
Open Loop Vol t age Gai n (dB)
VZ
IZ 40 9F 230 15k
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
VZ
Vol t ag e Sw i ng (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
150 VZ
Input 80 STABLE 60 STABLE
Cat hod e Curr ent (m A)
IZ 10k
40
20
0 10p 100p 1000p 0.01 0.1 1
Load Capacitance (F)
Vref < VZ < 20, IZ = 10mA, T A = 25C
Stability Boundary Conditions
ZHT431
Document number: DS32157 Rev. 11 - 2
Test Circuit for Stability Boundary Conditions
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ZHT431 DC Test Circuits
IL
Input
VZ IZ
IL
Input
VZ IZ
Input
VZ IZOFF
Iref
R1
Iref
Vref
R2
Vref
Fig 1 - Test circuit for V Z = V ref
Fig 2 - Test circuit for V Z > V ref
Fig 3 - Test circuit for Off state current
ZHT431
Document number: DS32157 Rev. 11 - 2
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ZHT431 Application Circuits
V+Vout V+Vout
R1 Vref Vref R2
R1
R2
Vout =
1+
R1 R2
Vref
Vout =
1+
R1 R2
Vref
Shunt regulator
V+
Higher current shunt regulator
+
ZSR***
In Out Common
Vout 30 R1 0.01F R1 R2 Vref R2 Vout
Vref
Vout
M IN
= Vref + Vreg 1+ R1 R2 Vref Vout = 1+ R1 R2 Vref
Vout =
Output control of a three terminal fixed regulator
Series regulator
V+
V+
R1A Output Input V on 2V Vref R2A
R1B Vref Output
V off = V+ V TH = 2.5V R2B
Low limit =
1+
R1B R2B
Vref
Single supply comparator with temperature compensated threshold
ZHT431
Document number: DS32157 Rev. 11 - 2
High limit = 1 +
R1A R2A
Vref
Over voltage / under voltage protection circuit
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ZHT431 Ordering Information
Ordering Reference ZHT431F01TA 1 ZHT431F01-7 2 ZHT431FMTA 1 ZHT431F02TA 1
Notes: 1. 2.
Tolerance (%) 1 1 0.5 2
Package SOT23 SOT23 SOT23 SOT23
Part Mark 43C 43C 43P 43D
Status Active Active Active Active
Reel Size (inches) 7 7 7 7
Quantity per reel 3000 3000 3000 3000
Tape Width 8mm 8mm 8mm 8mm
A `Green' molding compound is used from date code 1010. For further details, refer to http://www.diodes.com/quality/lead_free.html All date codes of the `-7' option use `Green' molding compound.
Package Outline Dimensions
SOT23
ZHT431
Document number: DS32157 Rev. 11 - 2
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November 2010
(c) Diodes Incorporated
A Product Line of Diodes Incorporated
ZHT431
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ZHT431
Document number: DS32157 Rev. 11 - 2
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November 2010
(c) Diodes Incorporated

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