TL431, A, B Series, NCV431A, B
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3
ELECTRICAL CHARACTERISTICS (T
A
= 25°C, unless otherwise noted.)
Characteristic
Symbol
TL431I TL431C
Unit
Min Typ Max Min Typ Max
Reference Input Voltage (Figure 1)
V
KA
= V
ref
, I
K
= 10 mA
T
A
= 25°C
T
A
= T
low
to T
high
(Note 1)
V
ref
2.44
2.41
2.495
−
2.55
2.58
2.44
2.423
2.495
−
2.55
2.567
V
Reference Input Voltage Deviation Over
Temperature Range (Figure 1, Notes 1, 2)
V
KA
= V
ref,
I
K
= 10 mA
DV
ref
− 7.0 30 − 3.0 17 mV
Ratio of Change in Reference Input Voltage to Change
in Cathode to Anode Voltage
I
K
= 10 mA (Figure 2),
DV
KA
= 10 V to V
ref
DV
KA
= 36 V to 10 V
DV
ref
DV
KA
−
−
−1.4
−1.0
−2.7
−2.0
−
−
−1.4
−1.0
−2.7
−2.0
mV/V
Reference Input Current (Figure 2)
I
K
= 10 mA, R1 = 10 k, R2 = ∞
T
A
= 25°C
T
A
= T
low
to T
high
(Note 1)
I
ref
−
−
1.8
−
4.0
6.5
−
−
1.8
−
4.0
5.2
mA
Reference Input Current Deviation Over
Temperature Range (Figure 2, Note 1, 4)
I
K
= 10 mA, R1 = 10 k, R2 = ∞
DI
ref
− 0.8 2.5 − 0.4 1.2
mA
Minimum Cathode Current For Regulation
V
KA
= V
ref
(Figure 1)
I
min
− 0.5 1.0 − 0.5 1.0 mA
Off−State Cathode Current (Figure 3)
V
KA
= 36 V, V
ref
= 0 V
I
off
− 20 1000 − 20 1000 nA
Dynamic Impedance (Figure 1, Note 3)
V
KA
= V
ref
, DI
K
= 1.0 mA to 100 mA
f ≤ 1.0 kHz
|Z
KA
| − 0.22 0.5 − 0.22 0.5
W
1. T
low
= −40°C for TL431AIP TL431AILP, TL431IP, TL431ILP, TL431BID, TL431BIP, TL431BILP, TL431AIDM, TL431IDM, TL431BIDM;
=0°C for TL431ACP, TL431ACLP, TL431CP, TL431CLP, TL431CD, TL431ACD, TL431BCD, TL431BCP, TL431BCLP, TL431CDM,
TL431ACDM, TL431BCDM
T
high
= +85°C for TL431AIP, TL431AILP, TL431IP, TL431ILP, TL431BID, TL431BIP, TL431BILP, TL431IDM, TL431AIDM, TL431BIDM
= +70°C for TL431ACP, TL431ACLP, TL431CP, TL431ACD, TL431BCD, TL431BCP, TL431BCLP, TL431CDM, TL431ACDM,
TL431BCDM
2. The deviation parameter DV
ref
is defined as the difference between the maximum and minimum values obtained over the full operating
ambient temperature range that applies.
DV
ref
= V
ref
max
-V
ref
min
DT
A
= T
2
- T
1
T2
Ambient Temperature
T1
V
ref
min
V
ref
max
The average temperature coefficient of the reference input voltage, aV
ref
is defined as:
V
ref
ppm
_C
+
ǒ
D V
ref
V
ref
@25_C
Ǔ
X10
6
D T
A
+
D V
ref
x10
6
D T
A
(V
ref
@25_C)
aV
ref
can be positive or negative depending on whether V
ref
Min or V
ref
Max occurs at the lower ambient temperature. (Refer to Figure 6.)
Example : DV
ref
+ 8.0 mV and slope is positive,
V
ref
@25_C + 2.495 V, DT
A
+ 70_C
a V
ref
+
0.008 x 10
6
70 (2.495)
+ 45.8 ppmń_C
3. The dynamic impedance Z
KA
is defined as:
|Z
KA
| +
D V
KA
D I
K
. When the device is programmed with two external resistors, R1 and R2,
(refer to Figure 2) the total dynamic impedance of the circuit is defined as:
|Z
KA
Ȁ| [ |Z
KA
|
ǒ
1 )
R1
R2
Ǔ
