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TL431SF Datasheet(PDF) 6 Page - HTC Korea TAEJIN Technology Co. |
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TL431SF Datasheet(HTML) 6 Page - HTC Korea TAEJIN Technology Co. |
6 / 12 page PROGRAMMABLE PRECISION SHUNT REGULATOR TL431/A/C Dec. 2010 – Rev.1.5 - 6 - HTC The deviation parameters ΔVREF/ΔT and ΔIREF/ΔT 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 : A 6 REF I(dev) REF ΔT 10 × ) 25 at V V ( = ) (ppm/ αV ℃ ℃ Where : ΔTA is the recommended operating free-air temperature range of the device. αVREF can be positive or negative, depending on whether minimum VREF or maximum VREF, respectively, occurs at the lower temperature. Example : Maximum VREF=2496mV at 30 , maximum V ℃ REF=2492mV at 0 , V ℃ REF=2495mV at 25 , ℃ ΔTA=70 for TL431C. ℃ ℃ ≈ ℃ 23ppm/ 70 10 × ) 2495mV 4mV ( = αV 6 REF Because minimum VREF occurs at the lower temperature, the coefficient is positive. Calculating Dynamic Impedance The dynamic impedance is defined as : KA KA KA ΔI ΔV = Z When the device is operating with two external resistors, the total dynamic impedance of the circuit is given by: () R1/R2 + 1 Z ≈ ΔI ΔV = Z KA ' |
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