UTC TL431A LINEAR INTEGRATED CIRCUIT PROGRAMMABLE PRECISION REFERENCE 1 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. 1 SOT-89 TO-92 2 1 FEATURES 3 *Programmable output Voltage to 36V. *Low dynamic output impedance 0.2Ω. SOT-23 *Sink current capability of 1 to 100mA. *Equivalent full-range temperature coefficient of 50ppm/ °C typical for operation over full rated operating temperature range. SOP-8 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 BLOCK DIAGRAM CATHODE REFERENCE CATHODE (K) REFERENCE (R) ANODE(A) 2.5V Vref ANODE UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R103-007,D UTC TL431A LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified)) PARAMETER SYMBOL VALUE UNIT VKA IKA Iref Tj Topr Tstg 37 -100 ~ +150 -0.05 ~ +10 150 -40 ~ +85 -65 ~ +150 V mA mA °C °C °C Cathode Voltage Cathode Current Range(Continuous) Reference Input Current Range Operating Junction Temperature Operating Ambient Temperature Storage Temperature Temperature RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL MIN VKA IKA VREF 1 Cathode Voltage Cathode Current TYP MAX UNIT 36 100 V mA ELECTRICAL CHARACTERISTICS (Ta=25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN Reference Input Voltage Vref VKA=VREF,IKA=10mA Deviation of reference Input Voltage Over temperature(note 1) Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Impedance ∆Vref/∆T VKA=VREF,IKA=10mA TMIN<=TA<=TMAX ∆VKA=10V~VREF IKA=10mA ∆VKA=36V~10V ∆Vref /∆VKA Iref ∆Iref/∆T IKA(min) IKA(OFF) ZKA IKA=10mA,R1=10kΩ, R2=∞ IKA=10mA,R1=10kΩ, R2=∞ TA=full Temperature VKA=VREF VKA=36V,VREF=0 VKA=VREF, IKA=1 to 100mA f≤1.0kHz TYP MAX UNIT 2.483 2.495 2.507 V 4.5 17 mV -1.0 -0.5 -2.7 -2.0 mV/V 1.5 0.4 4 1.2 µA µA 0.45 1.0 mA 0.05 0.15 1.0 0.5 µA Ω Note:TMIN=0°C,TMAX=+70°C 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 800 125 Ta=25℃ VKA=VREF 600 Cathode Current (mA) 100 Cathode Current (mA) Fig 2 Cathode Current Vs Cathode Voltage Ta=25℃ VKA=VREF 75 50 25 0 -25 400 IKA(min) 200 0 -50 -75 -100 -2 -200 -1 0 1 2 -2 3 -1 0 Cathode Voltage (V) Fig 3 Change in Reference Input Voltage Vs Cathode voltage 0 -15 -20 -25 -30 -35 6 5 4 3 2 1 -40 0 0 5 10 15 20 25 30 35 40 0 1 Cathode Voltage (V) 4 5 6 7 70 60 Voltage Amplification (dB) Impedance (Ω)? 10 3 Fig 6 Small Signal Voltage Amplification Vs Frequency 2 Ta=25℃ IKA=0mA to 100mA 10 2 Time (µ s) Fig 5 Dynamic Impedance Vs Frequency 10 3 Ta=25℃ 7 IKA=100mA Ta=25℃ -10 2 Fig 4 Pulse Response Input and Output Voltage (V) Change In Reference INput Voltage (mV) -5 1 Cathode Voltage (V) 1 0 Ta=25℃ IKA=10mA 50 40 30 20 10 0 -1 10 10 3 10 4 10 5 10 6 10 7 -10 3 10 10 Frequency (Hz) UTC UNISONIC TECHNOLOGIES 4 10 5 10 6 10 7 Frequency (Hz) CO., LTD. 3 QW-R103-007,D UTC TL431A LINEAR INTEGRATED CIRCUIT TEST CIRCUIT VKA INPUT INPUT VKA IKA VKA INPUT IKA IKA(OFF) R1 IREF UTC TL431A UTC TL431A R2 VREF UTC TL431A VREF VKA= VREF*(1+R1/R2)+IREF*R1 Fig 7 Test Circuit For VKA=VREF Fig 8 Test Circuit for VKA >= VREF Fig 9 Test Circuit For IKA(OFF) APPLICATION CIRCUIT Vi Vo IN Vi UTC7805 Vi COMMON R1 R1 VREF R1 VREF VREF R2 R2 UTC TL431A Vo=(1+R1/R2)*VREF Vo=(1+R1/R2)*VREF Fig 10 Shutdown Regulator Vi R2 UTC TL431A UTC TL431A Vo=(1+R1/R2)*VREF Fig 11 Output Control of a Three -Terminal Fixed Regulator Io Vo Vo Vo OUT Fig 12 Higher-current Shunt Regulator Vi Io Vo RCL Rs Rs UTC TL431A UTC TL431A IO=VREF/RS Fig 13 Constant-current Sink RS=VREF/RCL 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. 5 QW-R103-007,D