TL432A-Q1_16 Datasheet, PDF (5/24 Pages) Texas Instruments – ADJUSTABLE PRECISION SHUNT REGULATORS

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TL432A-Q1
TL432B-Q1
SLVS900A – NOVEMBER 2008 – REVISED JULY 2012
Deviation Parameters
The deviation parameters V_ref(dev) and I_ref(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, α_Vref, is defined as:
Ť Ť ǒ Ǔ ^{ǒ Ǔ} _aVref
VI(dev)
ppm
Vref at 25°C
°C ⁺
DT_A
10⁶
Maximum V_ref
Minimum V_ref
V_I(dev)
∆T_A
where:
∆T_A is the recommended operating free-air temperature range of the device.
a_{Vref can be positive or negative, depending on whether minimum Vref or maximum Vref, respectively, occurs at}
the lower temperature.
Example: V_ref = 2495 mV at 25°C, V_I(dev) = 14 mV, ∆T_A = 165°C for TL432B
Ť Ť _aVref
+
ǒ Ǔ 14 mV
2495 mV
165°C
10⁶
[
ppm
34 _°C
Because minimum V_ref occurs at the lower temperature, the coefficient is positive.
Dynamic Impedance
The dynamic impedance is defined
as:
|z_KA|
+
DV_KA
DI_KA
When the device is operating with two external resistors (see Figure 3), the total dynamic impedance of the circuit
is given by:
ǒ Ǔ |zȀ|
+
DV
DI
[
|z_KA|
1
)
R1
R2
Figure 1. Calculating Deviation Parameters and Dynamic Impedance
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