TL431Z Datasheet, PDF (5/10 Pages) List of Unclassifed Manufacturers – PROGRAMMABLE PRECISION SHUNT REGULATOR

PROGRAMMABLE PRECISION SHUNT REGULATOR
TL431Z/AZ/CZ
The deviation parameters ΔV_REF/ΔT and ΔI_REF/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, αV_REF, is defined as :
Where :
ΔT_A is the recommended operating free-air temperature range of the device.
αV_REF can be positive or negative, depending on whether minimum V_REF or maximum V_REF, respectively, occurs at
the lower temperature.
Example : Maximum V_REF=2496mV at 30℃, maximum V_REF=2492mV at 0℃, V_REF=2495mV at 25℃,
ΔT_A=70℃ for TL431CZ.
⎜⎛ ^4mV ⎟⎞ ^×106
a_VREF
= ^{⎝ 2495mV âŽ} 
70°C
≈ ^{23 ppm}
°C
Because minimum V_REF occurs at the lower temperature, the coefficient is positive.
Calculating Dynamic Impedance
The dynamic impedance is defined as :
Z _KA
= ^ΔVKA
ΔI _KA
When the device is operating with two external resistors, the total dynamic impedance of the circuit is given by :
Z'
=
ΔV
ΔI
≈
Z _KA
⎜⎛^{1 + R1} ⎟⎞
⎝ ^R2 ⎠
2009 – Obsolete
-5-
HTC