Datasheet TL431, TL432 (Diodes) - 3

TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR Electrical Characteristics (TA = +25°C, unless otherwise noted) Symbol Parameter Test Conditions Min Typ. Max Unit
VKA = VREF, TL431A 2.470 2.495 2.520 VREF Reference voltage V IKA = 10mA TL431B 2.482 2.495 2.507 TA = 0 to 70oC 6 16 Deviation of reference voltage over VKA = VREF, VDEV TA = -40 to +85oC 14 34 mV full temperature range (Note 5) IKA = 10mA TA = -40 to +125oC 14 34 ΔVREF Ratio of the change in reference VKA = 10V to VREF -1.4 -2.7 ΔV voltage to the change in cathode I mV/V KA KA = 10mA V voltage KA = 36V to 10V -1 -2 IREF Reference input current IKA = 10mA, R1 = 10KΩ, R2 = ∞ 1 4 µA I T KA = 10mA, A = 0 to 70oC 0.8 1.2 I ΔI REF deviation over full temperature REF R1 = 10KΩ, TA = -40 to +85oC 0.8 2.5 µA range (Note 7) R2 = ∞ TA = -40 to +125oC 0.8 2.5 Minimum cathode current for IKA(MIN) V regulation KA = VREF 0.4 0.7 mA IKA(OFF) Off-state current VKA = 36V, VREF = 0V 0.05 0.5 µA |ZKA| Dynamic output impedance (Note 8) VKA = VREF, f = 0Hz 0.2 0.5 Ω SOT23 380 Thermal Resistance Junction to θ o JA SOT C/W 25 250 Ambient SO-8* 70 Notes: 7. Deviation of VDEV, and ΔIREF are defined as the maximum variation of the values over the full temperature range. The average temperature coefficient of the reference input voltage αVREF is defined as: Vmax V DEV X 106 X 10 V @ 25º 5 C αV REF V ppm/ºC REF = T2 – T2 T1 Vmin Where: T2 – T1 = full temperature change. αV V = Vmax = Vma - Vmin REF can be positive or negative depending on whether the slope is DEV positive or negative. Notes: 8. The dynamic output impedance, RZ, is defined as: ΔV Δ KA T1 T2 Z = Temp e erature KA ΔI Δ KA When the device is programmed with two external resistors R1 and R2, the dynamic output impedance of the overall circuit, is defined as: ΔV Δ R1 Z’ = ≈ Z 1 + KA ΔI Δ R2 TL431 *SO-8 is a future package 3 of 14 April 2012 Document number: DS35044 Rev. 6 - 2
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