UTC UNISONIC TECHNOLOGIES CO. LTD. UTC TL431A LINEAR INTEGRATED CIRCUIT
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1. UTC E Rs VREF RCL Fig 13 Constant current Sink Fig 14 Current Limiting or Current Source UTC UNISONIC TECHNOLOGIES CO LTD 4 QW R103 007 D UTC TL431A LINEAR INTEGRATED CIRCUIT UTC assumes no responsibility for equipment failures that result from using products at values that exceed even momentarily rated values such as maximum ratings operating condition ranges or other parameters listed in products specifications of any and all UTC products described or contained herein UTC products are not designed for use in life support appliances devices or systems where malfunction of these products can be reasonably expected to result in personal injury Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner The information presented in this document does not form part of any quotation or contract is believed to be accurate and reliable and may be changed without notice UTC UNISONIC TECHNOLOGIES CO LTD s QW R103 007 D2. F VKA VREF zd 600 T E S E 400 3 5 IKA min Q s o o o o Bm 0 200 2 1 0 1 2 3 2 1 0 1 2 3 Cathode Voltage V Cathode Voltage V Fig 3 Change in Reference Input Voltage A Fig 4 Pulse Response M Vs Cathode voltage 9 P 5 7 Ta 25 C ad IkA 100mA sh 2 40 Ta 25 C M zZ 82 15 2 s c2 o bE T o 20 24 Yo S E5 25 23 o gt 9 2 S 30 52 o 7 35 1 40 0 0 5 10 15 20 25 30 35 40 0 1 2 3 4 5 6 7 Cathode Voltage V Time p s Fig 5 Dynamic Impedance Vs Frequency Fig 6 Small Signal Voltage Amplification Vs Frequency 70 10 Ta 25 C G Ta 25C lka OmA to 100mA IKATOA Eat a 10 c 40 9 e S 30 a g a a E ES y lt 20 10 2 10 o gt 0 10 10 10 10 10 10 107 10 10 10 10 107 Frequency Hz Frequency Hz UTC UNISONIC TECHNOLOGIES CO LTD QW R103 007 D UTC TL431A LINEAR INTEGRATED CIRCUIT TEST CIRCUIT Vka Vka INPUT Vka INPUT o Oo L o IKA OFF UTC TL431A UTC TL431A UTC TL431A VREF Vka VREF 1 R1 R2 IREF R1 7 Fig 7 Test Circuit For VKA VREF Fig 8 Test Circuit for VKA gt VREF Fig 9 Test Circuit For IKA OFF APPLICATION CIRCUIT o IN Vo Vi lurczsog U4 COMMON UTC TL431A Urequest UTETEASIA Vo 1 R1 R2 VREF Vo 1 R1 R2 VREF Vo 1 R1 R2 VREF Fig 10 Shutdown Regulator Fig 11 Output Control of a Three Fig 12 Higher current Shunt Regulator Terminal Fixed Regulator Vi Vo UTC TL431A lo VREF Rs
3. NS PARAMETER SYMBOL MIN VREF 1 PARAMETER SYMBOL TEST CONDITIONS Reference Input Voltage Deviation of reference Input Voltage AVref AT VKA VREF IKA 10MA Over temperature note 1 TMIN lt TA lt TMAX VKA VREF IKA 10MA Ratio of Change in Reference Input AVKA 10V VREF Voltage to the Change in Cathode AVref AVKA IKA 10mA AVKA 36V 10V Voltage IKA 10MA R1 10kQ R2 0 Deviation of Reference Input Current Alref AT IKA 10mA R1 10kQ R2 00 Minimum Cathode Current for IKA min VKA VREF Foo NN Off State Cathode Current KA OFF VKA 36V VREF 0 Dynamic Impedance ZKA VKA VREF IKA 1 to 100mA f lt 1 0kHz Note TMIN 0 C TMAX 70 C x lt 4 UTC UNISONIC TECHNOLOGIES CO LTD 2 QW R103 007 D UTC TL431A LINEAR INTEGRATED CIRCUIT TYPICAL PERFORMANCE CHARACTERISTICS Fig 1 Cathode Current Vs Cathode Voltage 800 Fig 2 Cathode Current Vs Cathode Voltage 125 Ta 25 C Ta 25 C VKA VRE
4. UTC TL431A PROGRAMMABLE PRECISION REFERENCE DESCRIPTION The UTC TL431A is a three terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges The output voltage may be set to any value between Vref approximately 2 5V and 36V with two external resistors It provides very wide applications including shunt regulator series regulator switching regulator voltage reference and others FEATURES Programmable output Voltage to 36V Low dynamic output impedance 0 20 Sink current capability of 1 to 100mA Equivalent full range temperature coefficient of 50ppm C typical for operation over full rated operating temperature range BLOCK DIAGRAM i CATHODE REFERENCE O Q UT C unisoNic TECHNOLOGIES TO 92 SOP 8 1 Cathode 2 3 6 7 Anode 8 Ref 4 5 N C TO 92 1 Ref 2 Anode 3 Cathode SOT 89 1 Ref 2 Anode 3 Cathode SOT 23 1 Cathode 2 Ref 3 Anode Pb free plating product number TL431AK CATHODE K REFERENCE R NODE A CO LTD LINEAR INTEGRATED CIRCUIT 1 QW R103 007 D UTC TL431A LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS Operating temperature range applies unless otherwise specified PARAMETER SYMBOL VALUE UNIT Cathode Voltage Reference Input Current Range lref 0 05 10 mA Operating Ambient Temperature Topr 40 85 C Storage Temperature Temperature 65 150 RECOMMENDED OPERATING CONDITIO
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UTC UNISONIC TECHNOLOGIES CO. LTD. UTC TL431A LINEAR INTEGRATED CIRCUIT