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TL431B-Q1 Datasheet(PDF) 4 Page - Texas Instruments |
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TL431B-Q1 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 26 page TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 electrical characteristics over recommended operating conditions, TA = 25°C (unless otherwise noted) PARAMETER TEST TEST CONDITIONS TL431BQ UNIT PARAMETER TEST CIRCUIT TEST CONDITIONS MIN TYP MAX UNIT Vref Reference voltage 2 VKA = Vref, IKA = 10 mA 2483 2495 2507 mV VI(dev) Deviation of reference voltage over full temperature range (see Figure 1) 2 VKA = Vref, IKA = 10 mA, TA = −40°C to 125°C 14 34 mV DVref Ratio of change in reference voltage 3 I 10 mA ΔVKA = 10 V − Vref −1.4 −2.7 mV DVref DVKA Ratio of change in reference voltage to the change in cathode voltage 3 IKA = 10 mA ΔVKA = 36 V − 10 V −1 −2 mV V Iref Reference current 3 IKA = 10 mA, R1 = 10 kΩ, R2 = ∞ 2 4 μA II(dev) Deviation of reference current over full temperature range (see Figure 1) 3 IKA = 10 mA, R1 = 10 kΩ, R2 = ∞, TA = −40°C to 125°C 0.8 2.5 μA Imin Minimum cathode current for regulation 2 VKA = Vref 0.4 0.7 mA Ioff Off-state cathode current 4 VKA = 36 V, Vref = 0 0.1 0.5 μA |zKA| Dynamic impedance (see Figure 1) 1 IKA = 1 mA to 100 mA, VKA = Vref, f ≤ 1 kHz 0.2 0.5 Ω The deviation parameters, Vref(dev) and Iref(dev), are defined as the differences between the maximum and minimum values obtained over the recommended temperature range. The average full-range temperature coefficient of the reference voltage, αVref, is defined as: where: ΔTA is the recommended operating free-air temperature range of the device. can be positive or negative, depending on whether minimum Vref or maximum Vref, respectively, occurs at the lower temperature. Example: maximum Vref = 2496 mV at 30°C, minimum Vref = 2492 mV at 0°C, Vref = 2495 mV at 25°C, ΔTA = 70°C for TL431 Because minimum Vref occurs at the lower temperature, the coefficient is positive. Calculating Dynamic Impedance The dynamic impedance is defined as: When the device is operating with two external resistors (see Figure 3), the total dynamic impedance of the circuit is given by: Maximum Vref Minimum Vref ΔTA VI(dev) aV ref ppm °C + VI(dev) Vref at 25°C 106 DTA aV ref + 4mV 2495 mV 106 70°C [ 23 ppm °C |z KA| + DVKA DIKA |z | + DV DI [ |z KA| 1 ) R1 R2 aV ref Figure 1. Calculating Deviation Parameters and Dynamic Impedance |
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