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CYStech Electronics Corp.
Adjustable Precision Shunt Regulators
Spec. No. : C502A3 Issued Date : 2003.03.26 Revised Date : 2005.06.29 Page No. : 1/6
TL431XA3
Description
The TL431 series are three-terminal adjustable regulators with guaranteed TO-92 thermal stability over applicable temperature ranges. The output voltage may be set to any value between VREF (approximately 2.495 volts) and 36 volts with two external resistors. These devices have a typical dynamic output impedance of 0.2. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacement for zener diodes in many applications.
Features
* Programmable output voltage * Temperature coefficient is 50ppm/C typical * Temperature compensated for operation over * full temperature range * Low output noise voltage * Fast turn on response * Pb-free package
Classification
Rank VREF A 2.4950.5% B 2.4951% C 2.4952%
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified) Characteristics Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range Power Dissipation Operating Temperature Range Storage Temperature Range
TL431A3
Symbol VKA IK IREF PD Topr Tstg
Value 37 -100~+150 0.05~+10 770 0~+70 -65~+150
Unit V mA mA mW C C
CYStek Product Specification
CYStech Electronics Corp.
Functional Block Diagram
Functional Block Diagram :
Cathode Reference VREF + Anode
Spec. No. : C502A3 Issued Date : 2003.03.26 Revised Date : 2005.06.29 Page No. : 2/6
& Symbol
Symbol :
Cathode
Reference Anode
Test Circuits
IN IREF IZ VREF R2 II VZ IN R1 II VZ IREF IZ VREF IN VZ
Fig1. Test Circuit for VZ=VREF
Fig 2. Test Circuit for VZ>VREF Note : VZ=VREF(1+R1/R2)+IREFxR1
Fig3. Test Circuit for Off-State Current
Electrical Characteristics ( Ta=25C unless otherwise specified )
Characteristics Symbol Test Conditions Reference Input Voltage TL431A VREF VKA=VREF, IK=10mA TL431B TL431C V =V , I =10mA Deviation of Reference Input Voltage VREF(dev) KA REF K Over-Temperature TminTaTmax IK=10mA, Ratio of Change in Reference Input VREF / VKA=10V-VREF Voltage to the Change in Cathode VKA IK=10mA, Voltage KKA=36V-10V IK=10mA, R1=10k, Reference Input Current IREF R2= Deviation of Reference Input Current I =10mA, R1=10k, IREF(dev) K Over Full Temperature Range R2=, Ta=Full Range Minimum Cathode Current for IK(min) VKA=VREF Regulation Off-State Cathode Current IK(off) VKA=36V, VREF=0 VKA=VREF, f1.0KHz Dynamic impedance ZKA IK=1 to 100mA
TL431A3
Min Typ Max Unit 2.445 2.495 2.545 2.470 2.495 2.520 V 2.480 2.495 2.510 4 -1.4 -1.0 2 0.4 0.4 0.1 0.2 17 -2.7 -2.0 4 1.2 1.0 1.0 0.5 mV mV V A A mA A
CYStek Product Specification
CYStech Electronics Corp.
Characteristic Curves
CATHODE CURRENT vs CATHODE VOLTAGE
800 IK - COTHODE CURRENT (uA) 700 600 500 400 300 200 100 0 -100 -200 -1 -0.5 0 0.5 1
Spec. No. : C502A3 Issued Date : 2003.03.26 Revised Date : 2005.06.29 Page No. : 3/6
CATHODE CURRENT vs CATHODE VOLTAGE
150 IK - COTHODE CURRENT (mA) 125 100 75 50 25 0 -25 -50 -75 -100 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 VAK - CATHODE VOLTAGE (V)
1.5
2
2.5
3
VAK - CATHODE VOLTAGE (V)
REFERENCE INPUT VOLTAGE vs AMBIENT TEMPERATURE
REFERENCE INPUT CURRENT vs AMBIENT TEMPERATURE
2.464 Vref - REFERENCE INPUT VOLTAGE (mV) 2.462 2.46 2.458 2.456 2.454 2.452 2.45 0 25 50 75 100 125 AMBIENT TEMPERATURE( )
350 Vref - REFERENCE INPUT CURRENT (nA) 300 250 200 150 100 50 0 0 25 50 75 100 125 AMBIENT TEMPERATURE( )
CATHODE VOLTAGE vs REFERENCE INPUT VOLTAGE
Z KA - DYNAMIC IMPEDANCE () Vref - REFERENCE INPUT VOLTAGE (mV)
DYNAMIC IMPEDANCE vs FREQUENCE 100
0 -5 -10 -15 -20 -25 -30 0 5 10 15 20 25 30 35 40 VKA - CATHODE VOLTAGE (V)
10
1
0.1 1 10 100 1000 f - FREQUENCE (KHz)
TL431A3
CYStek Product Specification
CYStech Electronics Corp.
OPEN-LOOP VOLTAGE GAIN vs FREQUENCY
Spec. No. : C502A3 Issued Date : 2003.03.26 Revised Date : 2005.06.29 Page No. : 4/6
OPEN-LOOP VOLTAGE GAIN (dB)
40 30 20 10 0 1 10 100 1000 F - FREQUENCY (KHz)
TL431A3
CYStek Product Specification
CYStech Electronics Corp.
TO-92 Taping Outline
H2 H2 H2A H2A A D2
Spec. No. : C502A3 Issued Date : 2003.03.26 Revised Date : 2005.06.29 Page No. : 5/6
H3
L
H4 H L1 H1 F1F2 D1
D
W1 W
T2 T T1
P1
P
P2
DIM A D D1 D2 F1,F2 F1,F2 H H1 H2 H2A H3 H4 L L1 P P1 P2 T T1 T2 W W1 -
Item Component body height Tape Feed Diameter Lead Diameter Component Body Diameter Component Lead Pitch F1-F2 Height Of Seating Plane Feed Hole Location Front To Rear Deflection Deflection Left Or Right Component Height Feed Hole To Bottom Of Component Lead Length After Component Removal Lead Wire Enclosure Feed Hole Pitch Center Of Seating Plane Location 4 Feed Hole Pitch Over All Tape Thickness Total Taped Package Thickness Carrier Tape Thickness Tape Width Adhesive Tape Width 20 pcs Pitch
Millimeters Min. 4.33 3.80 0.36 4.33 2.40 15.50 8.50 2.50 12.50 5.95 50.30 0.36 17.50 5.00 253 Max. 4.83 4.20 0.53 4.83 2.90 0.3 16.50 9.50 1 1 27 21 11 12.90 6.75 51.30 0.55 1.42 0.68 19.00 7.00 255
TL431A3
CYStek Product Specification
CYStech Electronics Corp.
TO-92 Dimension
2
Spec. No. : C502A3 Issued Date : 2003.03.26 Revised Date : 2005.06.29 Page No. : 6/6
A B
1 2 3
Marking:
3
431
C
D
H I E F
G
1
Style: Pin 1.Reference 2.Anode 3.Cathode 3-Lead TO-92 Plastic Package CYStek Package Code: A3
*: Typical
DIM A B C D E F
Inches Min. Max. 0.1704 0.1902 0.1704 0.1902 0.5000 0.0142 0.0220 *0.0500 0.1323 0.1480
Millimeters Min. Max. 4.33 4.83 4.33 4.83 12.70 0.36 0.56 *1.27 3.36 3.76
DIM G H I 1 2 3
Inches Min. Max. 0.0142 0.0220 *0.1000 *0.0500 *5 *2 *2
Millimeters Min. Max. 0.36 0.56 *2.54 *1.27 *5 *2 *2
Notes: 1.Controlling dimension: millimeters.
2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 3.If there is any question with packing specification or packing method, please contact your local CYStek sales office.
Material:
* Lead: 42 Alloy ; solder plating * Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0
Important Notice:
* All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek. * CYStek reserves the right to make changes to its products without notice. * CYStek semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems. * CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
TL431A3
CYStek Product Specification

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