PROGRAMMABLE PRECISION REFERENCE

UTC TL431A LINEAR INTEGRATED CIRCUIT 1 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. 1 SOT-89 TO-92 2 1 3 FEATURES *Programmable output Voltage to 36V. *Low dynamic output impedance 0.2Ω. *Sink current capability of 1 to 100mA. *Equivalent full-range temperature coefficient of 50ppm/ °C typical for operation over full rated operating temperature range. SOT-23 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 www.DataSheet4U.com BLOCK DIAGRAM CATHODE REFERENCE REFERENCE (R) ANODE(A) CATHODE (K) 2.5V Vref ANODE UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R103-007,D UTC TL431A PARAMETER LINEAR INTEGRATED CIRCUIT SYMBOL VKA IKA Iref Tj Topr Tstg ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified)) VALUE 37 -100 ~ +150 -0.05 ~ +10 150 -40 ~ +85 -65 ~ +150 UNIT 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 Cathode Voltage Cathode Current SYMBOL VKA IKA MIN VREF 1 TYP MAX 36 100 UNIT V mA ELECTRICAL CHARACTERISTICS (Ta=25°C, unless otherwise specified) PARAMETER Reference Input Voltage 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 Note:TMIN=0°C,TMAX=+70°C SYMBOL Vref ∆Vref/∆T TEST CONDITIONS VKA=VREF,IKA=10mA MIN TYP MAX UNIT V mV mV/V 2.483 2.495 2.507 4.5 -1.0 -0.5 1.5 0.4 0.45 0.05 0.15 17 -2.7 -2.0 4 1.2 1.0 1.0 0.5 VKA=VREF,IKA=10mA TMIN<=TA<=TMAX ∆VKA=10V~VREF ∆Vref /∆VKA IKA=10mA ∆VKA=36V~10V 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 µA µA mA µA Ω UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R103-007,D UTC TL431A LINEAR INTEGRATED CIRCUIT Fig 2 Cathode Current Vs Cathode Voltage Ta=25℃ VKA=VREF 600 TYPICAL PERFORMANCE CHARACTERISTICS Fig 1 Cathode Current Vs Cathode Voltage 125 Ta=25℃ VKA=VREF 800 Cathode Current (mA) 100 75 50 25 0 -25 -50 -75 -100 -2 Cathode Current (mA) 400 IKA(min) 200 0 -200 -1 0 1 2 3 -2 -1 0 1 2 3 Cathode Voltage (V) Cathode Voltage (V) 0 -5 Fig 3 Change in Reference Input Voltage Vs Cathode voltage 7 Fig 4 Pulse Response Ta=25℃ -10 -15 -20 -25 -30 -35 -40 0 5 10 15 20 25 Input and Output Voltage (V) 40 Change In Reference INput Voltage (mV) IKA=100mA Ta=25℃ 6 5 4 3 2 1 0 30 35 0 1 2 3 4 5 6 7 Cathode Voltage (V) Time (µ s) Fig 5 Dynamic Impedance Vs Frequency 10 2 Fig 6 Small Signal Voltage Amplification Vs Frequency 70 60 50 40 30 20 10 0 Ta=25℃ IKA=0mA to 100mA 10 1 Ta=25℃ IKA=10mA 10 0 10 -1 Voltage Amplification (dB) 3 4 5 6 7 Impedance (Ω)? 10 10 10 10 10 -10 3 10 10 4 10 5 10 6 10 7 Frequency (Hz) Frequency (Hz) UTC UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R103-007,D UTC TL431A TEST CIRCUIT INPUT IKA VKA LINEAR INTEGRATED CIRCUIT INPUT IKA R1 VKA INPUT VKA IKA(OFF) UTC TL431A IREF UTC TL431A UTC TL431A VREF R2 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 Vi IN Vi OUT R1 Vo UTC7805 COMMON Vo R1 R1 VREF R2 UTC TL431A UTC TL431A VREF R2 VREF R2 UTC TL431A 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 -Terminal Fixed Regulator Fig 12 Higher-current Shunt Regulator Vi Io Vo Vi Io RCL Vo Rs Rs UTC TL431A UTC TL431A IO=VREF/RS 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. 5 QW-R103-007,D