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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.
Features
* * * * * * * * Surface mount SOT223 and SOT23 packages 2% and 1% tolerance Maximum temperature coefficient 67 ppm/C Temperature compensated for operation over the full temperature range Programmable output voltage 50 A to 100mA current sink capability Low output noise Wide temperature range -55 to +125C
Applications
* * * * Series and shunt regulator Voltage monitor Over voltage / under voltage protection Switch mode power supplies
Pinout information
VREF GND GND VZ SOT223 Pinout - Top view
SOT23 Pinout - Top view
VZ GND VREF
Ordering information
Order reference ZHT431C01L ZHT431C01STOB ZHT431C01STZ ZHT431C02L ZHT431C02STOB ZHT431C02STZ ZHT431F01TA ZHT431F02TA ZHT431G01TA ZHT431G02TA Tolerance Package Part mark Status Reel size Quantity (%) (inches) per reel 1 TO92 ZHT43101 Obsolete Loose 4000 1 TO92 ZHT43101 Obsolete 12.5 1500 1 TO92 ZHT43101 Obsolete Concertina 1500 2 TO92 ZHT43102 Obsolete Loose 4000 2 TO92 ZHT43102 Obsolete 12.5 1500 2 TO92 ZHT43102 Obsolete Concertina 1500 1 SOT23 43C Released 7 3000 2 SOT23 43D Released 7 3000 1 SOT223 ZHT43101 Released 7 1000 2 SOT223 ZHT43102 Released 7 1000 Tape width 8mm 8mm 12mm 12mm
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ZHT431
Schematic diagram
VZ VREF
Gnd
Absolute maximum rating
Cathode voltage (VZ) Cathode current Operating temperature Storage temperature 20V 150mA -55 to 125C -55 to 150C Power dissipation (Tamb=25C) (Tjmax = 150C) SOT23 TO92 SOT223 Recommended operating conditions Min. Cathode voltage Cathode current VREF 50A Max. 20V 100mA 330mW 780mW 2W
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ZHT431
Electrical characteristics test conditions (unless otherwise stated):Tamb=25C
Symbol Parameter Min. VREF VDEV
V REF ---------------V Z
Value Typ. 2.50 2.50 10 -1.85 -1.0 0.12 0.04 Max. 2.55 2.525 30 -2.7 -2.0 1.0 0.2 2% 2.45
Units Conditions V V mV IL=10mA (Fig.1), VZ=VREF IL=10mA, VZ=VREF Tamb=full range (Fig1)
Reference voltage
1% 2.475 Deviation of reference input voltage over temperature Ratio of the change in reference voltage to the change in cathode voltage
mV/V VZ from VREF to 10V IZ=10mA (Fig.2) mv/V VZ from 10V to 20V IZ=10mA (Fig.2) A A 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
IREF IREF
Reference input current Deviation of reference input current over temperature Minimum cathode current for regulation Off-state current Dynamic output impedance
IZmin IZoff RZ
35
50 0.1 0.75
A A
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: V DEV x 1000000 ppm V REF ------------ = ---------------------------------------- C V REF ( T1 - T2 ) The dynamic output impedance, RZ, is defined as: RZ
Vmax
V Z = --------I Z
Vmin
Vdev = Vmax - Vmin
When the device is programmed with two externalresistors, R1 and R2, (fig 2) , the dynamic outputimpedance of the overall circuit, R', is defined as: R
T1
Temperature
T2
= R Z ( 1 + R1 ) -----R2
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ZHT431
Typical characteristics
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ZHT431
Typical characteristics
60
Open Loop Voltage Gain (dB)
VZ
IZ
40
230 15k 9F
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
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
150
Input
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
4-31
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ZHT431
DC test circuits
IL
Input
VZ IZ
IL
Input
VZ IZ
Input
Iref
R1
IZOFF
Iref
Vref
R2
Vref
Fig 1 - Test circuit for VZ = Vref
Fig 2 - Test circuit for VZ > Vref
Fig 3 - Test circuit for for Of state current
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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 MIN = Vref + Vreg Vout= 1+ R1 R2 Vref Vout= 1+ R1 R2 Vref
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 R1A R2A
Vref
Single supply comparator with temperature compensated threshold
High limit = 1 +
Vref
Over voltage / under voltage protection circuit
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ZHT431
Package outline - TO92
DIM Min. A b E e e1 L R S1 W D * 4.32 0.36 3.30 2.41 1.14 12.70 2.16 1.14 0.41 4.45 4
Millimeters Max. 4.95 0.51 3.94 2.67 1.40 15.49 2.41 1.52 0.56 4.95 6 Min. 0.170 0.014 0.130 0.095 0.045 0.500 0.085 0.045 0.016 0.175 4
Inches Max. 0.195 0.020 0.155 0.105 0.055 0.610 0.095 0.060 0.022 0.195 6
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
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ZHT431
Package outline - SOT23
E
e b 3 leads e1
L1
E1
D
A A1 L c
Dim. A B C D F G
Millimeters Min. 2.67 1.20 0.37 0.085 Max. 3.05 1.40 1.10 0.53 0.15
Inches Min. 0.105 0.047 0.015 0.0034 Max. 0.120 0.055 0.043 0.021 0.0059
Dim. H K L M N -
Millimeters Min. 0.33 0.01 2.10 0.45 Max. 0.51 0.10 2.50 0.64 -
Inches Max. 0.013 0.0004 0.083 0.018 Max. 0.020 0.004 0.0985 0.025 -
0.95 NOM
0.0375 NOM
1.90 NOM
0.075 NOM
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
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ZHT431
Package outline - SOT223
DIM A A1 b b2 C D
Millimeters Min 0.02 0.66 2.90 0.23 6.30 Max 1.80 0.10 0.84 3.10 0.33 6.70 -
Inches Min 0.0008 0.026 0.114 0.009 0.248 Max 0.071 0.004 0.033 0.122 0.013 0.264
DIM e e1 E E1 L -
Millimeters Min Max 2.30 BSC 4.60 BSC 6.70 3.30 0.90 7.30 3.70 -
Inches Min Max 0.0905 BSC 0.181 BSC 0.264 0.130 0.355 0.287 0.146 -
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
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Intentionally left blank
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ZHT431
Definitions Product change Zetex Semiconductors reserves the right to alter, without notice, specifications, design, price or conditions of supply of any product or service. Customers are solely responsible for obtaining the latest relevant information before placing orders. Applications disclaimer The circuits in this design/application note are offered as design ideas. It is the responsibility of the user to ensure that the circuit is fit for the user's application and meets with the user's requirements. No representation or warranty is given and no liability whatsoever is assumed by Zetex with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Zetex does not assume any legal responsibility or will not be held legally liable (whether in contract, tort (including negligence), breach of statutory duty, restriction or otherwise) for any damages, loss of profit, business, contract, opportunity or consequential loss in the use of these circuit applications, under any circumstances. Life support Zetex products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Zetex Semiconductors plc. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Reproduction The product specifications contained in this publication are issued to provide outline information only which (unless agreed by the company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. Terms and Conditions All products are sold subjects to Zetex' terms and conditions of sale, and this disclaimer (save in the event of a conflict between the two when the terms of the contract shall prevail) according to region, supplied at the time of order acknowledgement. For the latest information on technology, delivery terms and conditions and prices, please contact your nearest Zetex sales office or visit: www.zetex.com Quality of product Zetex is an ISO 9001 and TS16949 certified semiconductor manufacturer. To ensure quality of service and products we strongly advise the purchase of parts directly from Zetex Semiconductors or one of our regionally authorized distributors. For a complete listing of authorized distributors please visit: www.zetex.com/salesnetwork Zetex Semiconductors does not warrant or accept any liability whatsoever in respect of any parts purchased through unauthorized sales channels. ESD (Electrostatic discharge) Semiconductor devices are susceptible to damage by ESD. Suitable precautions should be taken when handling and transporting devices. The possible damage to devices depends on the circumstances of the handling and transporting, and the nature of the device. The extent of damage can vary from immediate functional or parametric malfunction to degradation of function or performance in use over time. Devices suspected of being affected should be replaced. Green compliance Zetex Semiconductors is committed to environmental excellence in all aspects of its operations which includes meeting or exceeding regulatory requirements with respect to the use of hazardous substances. Numerous successful programs have been implemented to reduce the use of hazardous substances and/or emissions. All Zetex components are compliant with the RoHS directive, and through this it is supporting its customers in their compliance with WEEE and ELV directives. Product status key: "Preview" Future device intended for production at some point. Samples may be available "Active" Product status recommended for new designs "Last time buy (LTB)" Device will be discontinued and last time buy period and delivery is in effect "Not recommended for new designs" Device is still in production to support existing designs and production "Obsolete" Production has been discontinued Datasheet status key: "Draft version" This term denotes a very early datasheet version and contains highly provisional information, which may change in any manner without notice. "Provisional version" This term denotes a pre-release datasheet. It provides a clear indication of anticipated performance. However, changes to the test conditions and specifications may occur, at any time and without notice. "Issue" This term denotes an issued datasheet containing finalized specifications. However, changes to specifications may occur, at any time and without notice. Zetex sales offices Europe Zetex GmbH Kustermann-park Balanstrae 59 D-81541 Munchen Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 europe.sales@zetex.com Americas Zetex Inc 700 Veterans Memorial Highway Hauppauge, NY 11788 USA Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 usa.sales@zetex.com Asia Pacific Zetex (Asia Ltd) 3701-04 Metroplaza Tower 1 Hing Fong Road, Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 asia.sales@zetex.com Corporate Headquarters Zetex Semiconductors plc Zetex Technology Park, Chadderton Oldham, OL9 9LL United Kingdom Telephone: (44) 161 622 4444 Fax: (44) 161 622 4446 hq@zetex.com
(c) 2006 Published by Zetex Semiconductors plc
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