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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 1 of 8 www.diodes.com November 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated 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 2 of 8 www.diodes.com November 2010 (c) Diodes Incorporated 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 3 of 8 www.diodes.com November 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated 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 4 of 8 www.diodes.com November 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated 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 5 of 8 www.diodes.com November 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated 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 6 of 8 www.diodes.com November 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated 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 7 of 8 www.diodes.com November 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated ZHT431 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated 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 Diodes Incorporated. 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. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright (c) 2010, Diodes Incorporated www.diodes.com ZHT431 Document number: DS32157 Rev. 11 - 2 8 of 8 www.diodes.com November 2010 (c) Diodes Incorporated |
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