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TL431GC 查看數據表(PDF) - HTC Korea

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TL431GC Datasheet PDF : 11 Pages
1 2 3 4 5 6 7 8 9 10
PROGRAMMABLE PRECISION SHUNT REGULATOR TL431/A/C
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 :
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 VREF=2492mV at 0, VREF=2495mV at 25,
ΔTA=70for TL431C.
⎜⎛ 4mV ⎟⎞ ×106
aVREF
= 2495mV
70°C
23 ppm
°C
Because minimum VREF 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
2008 – Rev. 1.2
-6-
HTC

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