TL431_05

UNISONIC TECHNOLOGIES CO., LTD TL431 PROGRAMMABLE PRECISION REFERENCE . 1 LINEAR INTEGRATED CIRCUIT 1 DESCRIPTION The UTC TL431 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 36 V with two external resistors. It provides very wide applications, including shunt regulator, series regulator, switching regulator, voltage reference and others. SOT-89 TO-92 SOP-8 3 3 1 2 1 5 4 2 FEATURES *Programmable output Voltage to 36V. *Low dynamic output impedance 0.2Ω. *Sink current capability of 1.0 to 100mA. *Equivalent full-range temperature coefficient of 50ppm/ °C typical for operation over full rated operating temperature range. SOT-23 SOT-25 *Pb-free plating product number: TL431K *Pb-free plating product for SOT-23NS type number: TL431NSL ORDERING INFORMATION Order Number Pin Assignment Package Normal Lead Free Plating 12345678 TL431-AB3-R TL431K-AB3-R RAK- - - - SOT-89 TL431-AE3-R TL431K-AE3-R KRA- - - - SOT-23 TL431NS-AE3-R TL431NSL-AE3-R RKA- - - - SOT-23 TL431-AF5-R TL431K-AF5-R XXKRA- - SOT-25 TL431-S08-R TL431K-S08-R KAAXXAAR SOP-8 TL431-S08-T TL431K-S08-T KAAXXAAR SOP-8 TL431-T92-B TL431K-T92-B RAK- - - - TO-92 TL431-T92-K TL431K-T92-K RAK- - - - TO-92 TL431-T92-R TL431K-T92-R RAK- - - - TO-92 Note: Pin Code: K: Cathode A: Anode R: Reference X: No Connection TL431K-AB3-R (1)Packing Type (2)Package Type (3)Lead Plating Packing Tape Reel Tape Reel Tape Reel Tape Reel Tape Reel Tube Tape Box Bulk Tape Reel (1) B: Tape Box, K: Bulk, R: Tape Reel, T: Tube (2) AB3: SOT-89, AE3: SOT-23, AF5: SOT-25, S 08:SOP-8, T92: TO-92 (3) K: Lead Free Plating, Blank: Pb/Sn L : Lead Free Plating Only for SOT-23NS Type , MARKING (SOT-23/SOT-25) 4 31 431N Lead Plating Lead Plating For TL431 For TL431NS www.unisonic.com.tw Copyright © 2005 Unisonic Technologies Co., Ltd 1 of 6 QW-R103-003,R TL431 BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT CATHODE REFERENCE CATHODE (K) REFERENCE (R) 2 .5V VREF ANODE(A) ANODE UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R103-003,R TL431 PARAMETER LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified) RATINGS UNIT Cathode Voltage 37 V Cathode Current Range(Continuous) -100 ~ +150 mA Reference Input Current Range -0.05 ~ +10 mA TO-92 770 mW Power Dissipation PD SOT-89 800 mW SOT-23/SOT-25 300 mW Operating Junction Temperature TJ +150 °C Operating Ambient Temperature TOPR -40 ~ +85 °C Storage Temperature TSTG -65 ~ +150 °C Note Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. SYMBOL VKA IKA IREF RECOMMENDED OPERATING CONDITIONS PARAMETER Cathode Voltage Cathode Current SYMBOL VKA IKA MIN VREF 1 TYP MAX 36 100 UNIT V mA ELECTRICAL CHARACTERISTICS (TC= 25℃, unless otherwise specified.) PARAMETER Reference Input Voltage Deviation of reference Input Voltage Over temperature 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 SYMBOL TEST CONDITIONS VREF VKA=VREF,IKA=10mA VKA=VREF,IKA=10mA ∆VREF/∆T 0°C≦Ta≦70°C ∆VKA=10V~VREF ∆VREF/∆VKA IKA=10mA ∆VKA=36V~10V IREF IKA=10mA, R1=10kΩ, R2=∞ IKA=10mA, R1=10kΩ, R2=∞ ∆IREF/∆T Ta =full Temperature IKA(MIN) VKA=VREF IKA(OFF) VKA=36V, VREF=0 VKA=VREF, IKA=1 to 100mA ZKA f≤1.0kHz MIN TYP MAX UNIT 2.470 2.495 2.520 V 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 mV mV/V µA µA mA µA Ω UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 6 QW-R103-003,R TL431 ■ TYPICAL CHARACTERISTICS Cathode Current vs . Cathode Voltage LINEAR INTEGRATED CIRCUIT Cathode Current vs . Cathode Voltage 800 125 Cathode Current (mA) 100 75 50 25 0 -25 -50 -75 -100 -2 Cathode Current (mA) Ta=25°C VKA =VREF 600 Ta=25°C VKA =VREF 400 IKA(MIN) 200 0 -200 -1 0 1 2 3 -2 -1 0 1 2 3 Cathode Voltage (V) Cathode Voltage (V) 0 Change in Reference Input Voltage vs . Cathode Voltage 7 Pulse Response Ta=25°C Change In Reference Input Voltage (mV) -5 Input and Output Voltage (V) 40 -10 -15 -20 -25 -30 -35 -40 0 5 10 15 20 25 IKA=100mA Ta=25°C 6 5 4 3 2 1 0 30 35 0 1 2 3 4 5 6 7 Cathode Voltage (V) Time (μs) Dynamic Impedance vs . Frequency 10 2 Small Signal Voltage Amplification vs . Frequency 70 Ta=25°C I KA=0mA to 100mA 10 1 60 Ta=25°C IKA=10mA Voltage Amplification (dB) 3 4 5 6 7 50 40 30 20 10 0 Impedance (Ω) 10 0 10 -1 10 10 10 10 10 -10 3 10 10 4 10 5 10 6 10 7 Frequency (Hz) Frequency (Hz) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 6 QW-R103-003,R TL431 TYPICAL CHARACTERISTICS (Cont.) 2.52 2.51 LINEAR INTEGRATED CIRCUIT Reference Voltage 2.5 2.49 2.48 2.47 2.46 2.45 0° C 0° C 0° C 20 ° 40 ° 60 ° -4 -2 80 ° 1μ Temperature 140 120 A VKA =Vref B VKA =5.0V@IK=10mA C VKA=10V@IK =10mA D VKA=15V@IK =10mA Ta=25℃ A B Cathode Current, IK (mA) 100 80 60 C unstable stable stable D 40 20 0 100p 1n 10n 100n 10 10μ Load Capacitance, CL UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 0° C C C C C 5 of 6 QW-R103-003,R TL431 TEST CIRCUIT VKA IKA R1 UTC TL431 LINEAR INTEGRATED CIRCUIT INPUT INPUT IKA VKA INPUT VKA IKA(OFF) IREF UTC TL431 UTC TL431 VREF R2 VREF VKA=VREF*(1+R1/R2)+IREF*R1 For VKA=VREF For VKA≧ VREF For IKA(OFF) APPLICATION CIRCUIT VIN IN VIN Vo UT VIN UTC7805 COMMON OUT R1 VoUT VoUT R1 R1 VREF R2 UTC TL431 UTC TL431 VREF R2 VREF R2 UTC TL431 Vo=(1+R1/R2)*VREF Vo=(1+R1/R2)*VREF Vo=(1+R1/R2)*VREF Shutdown Regulator Output Control of a Three -Terminal Fixed Regulator Higher-current Shunt Regulator VIN Io VoUT VIN Io RCL VoUT Rs Rs UTC TL431 UTC TL431 IO=VREF/RS RS=VREF/RCL Constant-current Sink Current Limiting or Current Source 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 6 QW-R103-003,R