E T - TL431 Adjustable Precision Shunt Regulator Description The ET TL431 is a three-terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between Vref and 36 volts with two external resistors. These device have a typical dynamic output impedance of 0.27Ω, Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacement for zener diodes in many applications. ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ Symbol ¾ ¾ ¾ ¾ ¾ ¾ Features Programmable Output Voltage to 36V. Low Dynamic Output Impedance : ET TL431xxC/I: 0.27Ω (Typical). ET TL431xxQ: 0.15Ω (Typical) Sink Current Capability of 0.1mA to 100mA. Equivalent Full-Range Temperature Coefficient of 50 ppm/oC Temperature Compensated for Operation over Full Rated Operating Temperature Range. Low Output Noise Voltage. Fast Turn on Responds. SOT-23, TO-92, SOT-89, SOP-8 packages Applications Precision Voltage Reference Linear Regulator Adjustable Power Supply Switching Power Supply Graphic Card Adapter Pin Description www.estek.com.cn 1 Copyright @ Estek Electronics Co., Ltd Version 0.5 8th Dec. 2011 E T - TL431 Ordering Information Part Number Accurate Temperature Pin Assignment Package Packing R A C SOT-23 1 3 2 Tape & Reel TO-92 1 2 3 Tape & Box SOT-89 1 2 3 Tape & Reel TL431AKC SOP-8 8 2,3,6,7 1 Tape & Reel TL431AAI SOT-23 1 3 2 Tape & Reel TO-92 1 2 3 Tape & Box SOT-89 1 2 3 Tape & Reel TL431AKI SOP-8 8 2,3,6,7 1 Tape & Reel TL431AAQ SOT-23 1 3 2 Tape & Reel TO-92 1 2 3 Tape & Box SOT-89 1 2 3 Tape & Reel TL431AKQ SOP-8 8 2,3,6,7 1 Tape & Reel TL431BAC SOT-23 1 3 2 Tape & Reel TO-92 1 2 3 Tape & Box SOT-89 1 2 3 Tape & Reel TL431BKC SOP-8 8 2,3,6,7 1 Tape & Reel TL431BAI SOT-23 1 3 2 Tape & Reel TO-92 1 2 3 Tape & Box SOT-89 1 2 3 Tape & Reel TL431BKI SOP-8 8 2,3,6,7 1 Tape & Reel TL431BAQ SOT-23 1 3 2 Tape & Reel TO-92 1 2 3 Tape & Box SOT-89 1 2 3 Tape & Reel SOP-8 8 2,3,6,7 1 Tape & Reel TL431AAC TL431AEC 0oC~+70oC TL431ADC TL431AEI 0.5% TL431ADI TL431AEQ -40oC ~+125oC -60oC ~+125oC TL431ADQ TL431BEC 0oC~+70oC TL431BDC TL431BEI 1% TL431BDI TL431BEQ -40oC ~+125oC -60oC ~+125oC TL431BDQ TL431BKQ Absolute Maximum Ratings Symbol VKA IK IREF Toper. TJ Tstg Parameter Cathode Voltage Value ET TL431xxC/I 40 ET TL431xxQ 42 Cathode Current Range(Continuous) Reference Input Current Range Operating Temperature Range Junction Temperature Range Storage Temperature Range www.estek.com.cn 2 Unit V -100~150 mA 0.05~10 mA ET TL431xxC 0~+70 ET TL431xxI -40~+125 ET TL431xxQ -60~+125 o C 150 o -65~+150 o C C Copyright @ Estek Electronics Co., Ltd Version 0.5 8th Dec. 2011 E T - TL431 Thermal Characteristics Symbol Parameter Package Typical Value SOT-23 416 θJA Thermal Resistance From Junction to Ambient in Free Air. (Measured with the component mounted on a high effective thermal conductivity test board in free air.) TO-92 250 SOT-89 250 SOP-8 210 o C/W Recommended Operating Conditions Symbol Unit Characteristic VKA Cathode Voltage IK Cathode Current Min. Typ. Max. TL431xxC/I VREF - 36 TL431xxQ VREF TL431xxC/Q 0.5 - 100 TL431xxI 1 - 100 Unit V 40 mA Electrical Characteristics (Ta=25 °C, VKA=VREF, IK=10mA unless otherwise noted .) Symbol Parameter Test Condition Min. VREF VREF(dev) Reference input Voltage VKA=VREF, IK=10mA Deviation of Reference Input Voltage Over Full Temperature Range Tmin≦Ta≦Tmax Typ. Max. 0.5% 2.483 2.495 2.508 1% 2.470 2.495 2.520 - 3 17 △VKA=10V-VREF -0.4 - 2.7 △VKA=36V-10V -0.4 - 2.0 Unit V mV △VREF /△VKA Ratio of change in Reference input Voltage to the Change in Cathode Voltage IREF Reference Input Current R1=10KΩ, R2=∞ - 1.8 4 uA IREF(dev) Deviation of Reference Input Current Over Full Temperature Range R1=10KΩ, R2=∞ - 0.4 1.2 uA IK(min) Minimum Cathode Current for Regulation - 0.25 0.5 mA IK(off) Off-State Cathode Current VKA=40V, VREF=0 - 0.17 0.9 uA Dynamic Impedance IK=1mA to 100mA f≦1.0KHz - 0.27 0.5 0.15 0.5 ZKA www.estek.com.cn TL431xxC/I TL431xxQ 3 mV/ V Ω Copyright @ Estek Electronics Co., Ltd Version 0.5 8th Dec. 2011 E T - TL431 Test Circuit Typical Application Circuits Notes for Typical Application Circuits: 1. For the series regulator applications, add a compensation capacitor C1 between CATHODE and REF is strongly recommended to improve the stability of output voltage. 2. Set Vo according to the following equation: Vo=VREF(1+R1/R2)+IREFxR1. 3. Choose the Value for RB as below: (1). The maximum limit for RB should be such that the cathode current (IK) is greater than the minimum operating current (0.5mA) at VIN(MIN). (2). The minimum limit for RB should be such that the cathode current (IK) does not exceed 100mA under all load conditions, and the instantaneous turn-on value for IK does not exceed 120mA. B B B www.estek.com.cn 4 Copyright @ Estek Electronics Co., Ltd Version 0.5 8th Dec. 2011 E T - TL431 Typical Characteristics www.estek.com.cn 5 Copyright @ Estek Electronics Co., Ltd Version 0.5 8th Dec. 2011 E T - TL431 Typical Characteristics www.estek.com.cn (Continued) 6 Copyright @ Estek Electronics Co., Ltd Version 0.5 8th Dec. 2011 E T - TL431 Typical Characteristics www.estek.com.cn (Continued) 7 Copyright @ Estek Electronics Co., Ltd Version 0.5 8th Dec. 2011 E T - TL431 Package Information SOT-23 www.estek.com.cn 8 Copyright @ Estek Electronics Co., Ltd Version 0.5 8th Dec. 2011 E T - TL431 Package Information TO-92 www.estek.com.cn 9 Copyright @ Estek Electronics Co., Ltd Version 0.5 8th Dec. 2011 E T - TL431 Package Information SOT-89 www.estek.com.cn 10 Copyright @ Estek Electronics Co., Ltd Version 0.5 8th Dec. 2011 E T - TL431 Package Information SOP-8 www.estek.com.cn 11 Copyright @ Estek Electronics Co., Ltd Version 0.5 8th Dec. 2011