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TL431QDBZR Datasheet(PDF) 10 Page - Texas Instruments |
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TL431QDBZR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 40 page TL431, TL431A, TL431B, TL432, TL432A, TL432B ADJUSTABLE PRECISION SHUNT REGULATORS SLVS543A – AUGUST 2004 − REVISED AUGUST 2004 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 electrical characteristics over recommended operating conditions, TA = 25°C (unless otherwise noted) PARAMETER TEST TEST CONDITIONS TL431C, TL432C UNIT PARAMETER TEST CIRCUIT TEST CONDITIONS MIN TYP MAX UNIT Vref Reference voltage 2 VKA = Vref, IKA = 10 mA 2440 2495 2550 mV VI(dev) Deviation of reference voltage over full temperature range 2 VKA = Vref, IKA = 10 mA, SOT23-3 and TL432 devices 6 16 mV VI(dev) over full temperature range (see Figure 1) 2 IKA = 10 mA, TA = 0°C to 70°C All other devices 4 25 mV DV ref Ratio of change in reference voltage 3 IKA = 10 mA ∆VKA = 10 V − Vref −1.4 −2.7 mV DV ref DV KA Ratio of change in reference voltage to the change in cathode voltage 3 IKA = 10 mA ∆VKA = 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 = 0°C to 70°C 0.4 1.2 µA Imin Minimum cathode current for regulation 2 VKA = Vref 0.4 1 mA Ioff Off-state cathode current 4 VKA = 36 V, Vref = 0 0.1 1 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: ∆TA 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, ∆TA = 70°C for TL431C 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 ∆TA VI(dev) a V ref ppm °C + V I(dev) V ref at 25 °C 106 DT A a V ref + 4mV 2495 mV 106 70 °C [ 23 ppm °C |z KA| + DV KA DI KA |z | + DV DI [ |z KA| 1 ) R1 R2 aV ref Figure 1. Calculating Deviation Parameters and Dynamic Impedance |
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