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TL431-Q1 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
TL431-Q1 ADJUSTABLE PRECISION SHUNT REGULATOR TI
Texas Instruments TI
TL431-Q1 Datasheet PDF : 23 Pages
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TL431-Q1
ADJUSTABLE PRECISION SHUNT REGULATOR
SGLS302C − MARCH 2005 − REVISED APRIL 2008
electrical characteristics over recommended operating conditions, TA = 25°C (unless otherwise
noted)
Vref
VI(dev)
DVref
DVKA
Iref
II(dev)
Imin
Ioff
|zKA|
PARAMETER
TEST
CIRCUIT
TEST CONDITIONS
Reference voltage
Deviation of reference voltage
over full temperature range
(see Figure 1)
2
VKA = Vref, IKA = 10 mA
2
VKA = Vref, IKA = 10 mA,
TA = −40°C to 125°C
Ratio of change in reference voltage
to the change in cathode voltage
3
IKA = 10 mA
VKA = 10 V − Vref
VKA = 36 V − 10 V
Reference current
3
IKA = 10 mA, R1 = 10 k, R2 =
Deviation of reference current
over full temperature range
(see Figure 1)
3
IKA = 10 mA, R1 = 10 k, R2 = ,
TA = −40°C to 125°C
Minimum cathode current
for regulation
2
VKA = Vref
Off-state cathode current
Dynamic impedance (see Figure 1)
4
VKA = 36 V, Vref = 0
1
IKA = 1 mA to 100 mA, VKA = Vref,
f 1 kHz
TL431BQ
MIN TYP MAX
2483 2495 2507
UNIT
mV
14
34 mV
−1.4 −2.7 mV
−1
−2 V
2
4 µA
0.8 2.5 µA
0.4 0.7 mA
0.1 0.5 µA
0.2 0.5
The deviation parameters, Vref(dev) and Iref(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, αVref, is defined as:
Ť Ť ǒ Ǔ ǒ Ǔ aVref
VI(dev)
ppm
°C
+
Vref at 25°C
DTA
106
Maximum Vref
Minimum Vref
VI(dev)
TA
where:
TA is the recommended operating free-air temperature range of the device.
aVref can be positive or negative, depending on whether minimum Vref or maximum Vref, respectively, occurs at the
lower temperature.
Example: maximum Vref = 2496 mV at 30°C, minimum Vref = 2492 mV at 0°C, Vref = 2495 mV at 25°C,
TA = 70°C for TL431
Ť Ť aVref
ǒ 4 mV Ǔ
+
2495 mV
70°C
106
[
23 ppm
°C
Because minimum Vref occurs at the lower temperature, the coefficient is positive.
Calculating Dynamic Impedance
The dynamic impedance is defined as:
|zKA|
+
DVKA
DIKA
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
[
|zKA|
1
)
R1
R2
Figure 1. Calculating Deviation Parameters and Dynamic Impedance
4
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