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TL431ACD Datasheet(Fiches technique) 12 Page - Texas Instruments

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Numéro de pièce TL431ACD
Description  ADJUSTABLE PRECISION SHUNT REGULATORS
Télécharger  67 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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 12 page
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TL431, TL431A, TL431B
TL432, TL432A, TL432B
ADJUSTABLE PRECISION SHUNT REGULATORS
SLVS543J − AUGUST 2004 − REVISED DECEMBER 2005
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating conditions, TA = 25°C (unless otherwise
noted)
PARAMETER
TEST
CIRCUIT
TEST CONDITIONS
TL431C
TL432C
UNIT
PARAMETER
CIRCUIT
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Vref
Reference voltage
2
VKA = Vref,
IKA = 10 mA
2440
2495
2550
mV
VI(dev)
Deviation of reference voltage
over full temperature range
2
VKA = Vref,
IKA = 10 mA,
SOT23-3 and TL432
devices
6
16
mV
VI(dev)
over full temperature range
(see Figure 1)
2
IKA = 10 mA,
TA = 0°C to 70°C
All other devices
4
25
mV
DV
ref
Ratio of change in reference voltage
3
IKA = 10 mA
∆VKA = 10 V − Vref
−1.4
−2.7
mV
DV
ref
DV
KA
Ratio of change in reference voltage
to the change in cathode voltage
3
IKA = 10 mA
∆VKA = 36 V − 10 V
−1
−2
mV
V
Iref
Reference current
3
IKA = 10 mA, R1 = 10 kΩ, R2 = ∞
2
4
µA
II(dev)
Deviation of reference current
over full temperature range
(see Figure 1)
3
IKA = 10 mA, R1 = 10 kΩ, R2 = ∞,
TA = 0°C to 70°C
0.4
1.2
µA
Imin
Minimum cathode current
for regulation
2
VKA = Vref
0.4
1
mA
Ioff
Off-state cathode current
4
VKA = 36 V,
Vref = 0
0.1
1
µA
|zKA|
Dynamic impedance (see Figure 1)
1
IKA = 1 mA to 100 mA, VKA = Vref,
f
≤ 1 kHz
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:
where:
∆TA is the recommended operating free-air temperature range of the device.
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 TL431C
Because minimum Vref occurs at the lower temperature, the coefficient is positive.
Calculating Dynamic Impedance
The dynamic impedance is defined as:
When the device is operating with two external resistors (see Figure 3), the total dynamic impedance of the circuit
is given by:
Maximum Vref
Minimum Vref
∆TA
VI(dev)
a
V
ref
ppm
°C +
V
I(dev)
V
ref
at 25
°C
106
DT
A
a
V
ref
+
4mV
2495 mV
106
70
°C
[
23 ppm
°C
|z
KA|
+
DV
KA
DI
KA
|z |
+ DV
DI [
|z
KA|
1
) R1
R2
aV
ref
Figure 1. Calculating Deviation Parameters and Dynamic Impedance




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