TL431, A, B Series
4MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (TA = 25°C, unless otherwise noted.)
TL431AI TL431AC TL431B
Characteristic Symbol Min Typ Max Min Typ Max Min Typ Max Unit
Reference Input Voltage (Figure 1) V ref V
VKA = Vref, IK = 10 mA
TA = 25°C 2.47 2.495 2.52 2.47 2.495 2.52 2.483 2.495 2.507
TA = Tlow to Thigh 2.44 – 2.55 2.453 – 2.537 2.475 2.495 2.515
Reference Input Voltage Deviation Over ∆Vref –7.0 – – 3.0 – – 3.0 – mV
Temperature Range (Figure 1, Notes 1, 2)
VKA= Vref, IK = 10 mA
Ratio of Change in Reference Input Voltage
D
V
mV/V
to Change in Cathode to Anode Voltage
D
V
IK = 10 mA (Figure 2),
KA
∆VKA = 10 V to Vref ––1.4 –2.7 – –1.4 –2.7 – –1.4 –2.7
∆VKA = 36 V to 10 V – –1.0 –2.0 – –1.0 –2.0 – –1.0 –2.0
Reference Input Current (Figure 2) ∆Iref µA
IK = 10 mA, R1 = 10 k, R2 = ∞
TA = 25°C – 1.8 4.0 – 1.8 4.0 – 1.1 2.0
TA = Tlow to Thigh (Note 1) – – 6.5 – – 5.2 – – 4.0
Reference Input Current Deviation Over ∆Iref –0.8 2.5 – 0.4 1.2 – 0.4 1.2 µA
Temperature Range (Figure 2, Note 1)
IK = 10 mA, R1 = 10 k, R2 = ∞
Minimum Cathode Current For Regulation Imin –0.5 1.0 – 0.5 1.0 – 0.5 1.0 mA
VKA = V ref (Figure 1)
Off–State Cathode Current (Figure 3) Ioff –260 1000 – 260 1000 – 230 500 nA
VKA = 36 V, Vref = 0 V
Dynamic Impedance (Figure 1, Note 3) |ZKA| – 0.22 0.5 – 0.22 0.5 – 0.14 0.3 Ω
VKA = Vref, ∆IK = 1.0 mA to 100 mA
f ≤ 1.0 kHz
NOTES: 1.Tlow = –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
Thigh= +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 ∆Vref is defined as the difference between the maximum and minimum values obtained over the full operating ambient
temperature range that applies.
∆
Vref = Vref max
–Vref min
∆
TA = T2 – T1
T2
Ambient Temperature
T1
Vref min
Vref max
The average temperature coef ficient of the reference input voltage, αVref is defined as:
Vref ppm
_
C
+
ǒ
D
Vref
Vref @25
_
C
Ǔ
X10
6
D
T
A
+
D
V
ref x10
6
D
T
A(Vref @25
_
C)
αVref can be positive or negative depending on whether Vref Min or Vref Max occurs at the lower ambient temperature. (Refer to Figure 6.)
Example :
D
Vref
+
8.0 mV and slope is positive,
Vref @25
_
C
+
2.495 V,
D
TA
+
70
_
C
a
Vref
+
0.008 x 106
70 (2.495)
+
45.8 ppm
ń
_
C
3.The dynamic impedance ZKA is defined as |ZKA|
+
D
VKA
D
IK
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:
|ZKA
Ȁ
|
[
|ZKA|
ǒ
1
)
R1
R2
Ǔ