TL431

TL431 Adjustable Accurate Reference Source DEVICE DESCRIPSION: The TL431 is a three-terminal adjustable shunt regulator offering excellent temperature stability . This device has a typical dynamic output impedance of 0.2Ω. The device can be used as a replacement for zener diodes in many applications. FEATURES: #.The output voltage can be adjusted to 36V #.Low dynamic output impedance, its typical value is 0.2Ω #.Trapping current capability is 1 to 100mA #.Low output noise voltage #.Fast on -state response #.The effective temperature compensation in the working range of full temperature #.The typical value of the equivalent temperature factor in the whole temperature scope is 50 ppm/℃ APPLICATION: MARKING: ● Shunt Regulator ● High-Current Shunt Regulator ● Precision Current Limiter ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified) Parameter Symbol Value Unit Cathode Voltage VKA 37 V Cathode Current Range (Continuous) IKA -100~+150 mA Reference lnput Current Range Iref 0.05~+150 mA Power Dissipation PD 300 mW RθJA 417 ℃/W Tj 150 ℃ Operating Ambient Temperature Range Topr -25~+85 ℃ Storage temperature Range Tstg -65~+150 ℃ Thermal Resistance from Junction to Ambient Operating Junction Temperature www.yongyutai.com PAGE 1 TL431 ELECTRICAL CHARACTERISTICS (Ta=25℃ unless otherwise specified) Parameter Symbol Test Condition Min Typ Max Unit Vref VKA=VREF, IKA=10mA 2.475 2.5 2.525 V 4.5 17 mV △ VKA=10V~VRE -1.0 -2.7 mV/V △ VKA=36V~10V -0.5 -2.0 mV/V 1.5 4 µA 0.4 1.2 µA Reference input voltage (Fig.1) Deviation of reference input voltage over temperature (note) (Fig.1) △Vref /△T VKA =VREF, IKA =10mA TMIN≤Ta≤TMAX Ratio of change in reference input voltage to the change in cathode △Vref /△VKA IKA=10mA voltage (Fig.2) lref Reference input current (Fig.2) Deviation Of reference input current over full temperature range (Fig.2) △lref /△T Minimum cathode current for regulation (Fig.1) Off-state cathode Current (Fig.3) Dynamic impedance lKA=10mA, R1=10kΩ R2=∞ lKA=10mA, R1=10kΩ R2=∞ TA=-25 to 85℃ IKA(min) VKA=VREF, IKA=10mA 0.45 1.0 mA IKA(OFF) VKA=36V,VREF=0 0.05 1.0 µA 0.15 0.5 Ω ZKA VKA=VREF, lKA=1 to100mA f≤1.0kHz Note: TMIN=-25℃ ,TMAX=+85℃ CLASSIFICATION of Vref Rank 0.50% 1% Range 2.487-2.513 2.475-2.525 Figure 1. Test Circuit for VKA = Vref www.yongyutai.com Figure 2. Test Circuit for VKA >Vref Figure 3. Test Circuit for Ioff PAGE 2 TL431 www.yongyutai.com PAGE 3