TL431 Datasheet, PDF (3/16 Pages) Motorola, Inc – PROGRAMMABLE PRECISION REFERENCES

TL431, A, B Series
ELECTRICAL CHARACTERISTICS (TA = 25°C, unless otherwise noted.)
TL431I
TL431C
Characteristic
Symbol Min
Typ
Max
Min
Typ
Max Unit
Reference Input Voltage (Figure 1)
VKA = Vref, IK = 10 mA
TA = 25°C
TA = Tlow to Thigh (Note 1)
Reference Input Voltage Deviation Over
Temperature Range (Figure 1, Notes 1, 2)
VKA= Vref, IK = 10 mA
Ratio of Change in Reference Input Voltage
to Change in Cathode to Anode Voltage
IK = 10 mA (Figure 2),
∆VKA = 10 V to Vref
∆VKA = 36 V to 10 V
Reference Input Current (Figure 2)
IK = 10 mA, R1 = 10 k, R2 = ∞
TA = 25°C
TA = Tlow to Thigh (Note 1)
Reference Input Current Deviation Over
Temperature Range (Figure 2, Note 1, 4)
IK = 10 mA, R1 = 10 k, R2 = ∞
Minimum Cathode Current For Regulation
VKA = Vref (Figure 1)
Off–State Cathode Current (Figure 3)
VKA = 36 V, Vref = 0 V
Dynamic Impedance (Figure 1, Note 3)
VKA = Vref, ∆IK = 1.0 mA to 100 mA
f ≤ 1.0 kHz
Vref
∆Vref
V
2.44 2.495 2.55 2.44 2.495 2.55
2.41
–
2.58 2.423
–
2.567
–
7.0
–
–
3.0
–
mV
DVref
DVKA
mV/V
–
–1.4 –2.7
–
–1.4 –2.7
–
–1.0 –2.0
–
–1.0 –2.0
Iref
µA
∆Iref
–
1.8
4.0
–
1.8
4.0
–
–
6.5
–
–
5.2
–
0.8
2.5
–
0.4
1.2
µA
Imin
Ioff
|ZKA|
–
0.5
1.0
–
0.5
1.0
mA
–
260 1000
–
2.6
1000
nA
–
0.22
0.5
–
0.22
0.5
Ω
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 max
Vref min
∆Vref = Vref max
–Vref min
∆TA = T2 – T1
T1 _{Ambient Temperature} T2
The average temperature coefficient of the reference input voltage, αVref is defined as:
ǒ Ǔ _ppm
+ + Vref _{_C}
D Vref
Vref @ 25_C
D TA
X 106
D Vref x 106
D TA (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 : DVref 8.0 mV and slope is positive,
+ + _{+ + ń} Vref @ 25_C 2.495 V, DTA 70_C
a Vref
0.008 x 106
70 (2.495)
45.8 ppm _C
+ 3. The dynamic impedance ZKA is defined as |ZKA|
D VKA
D IK
Ȁ [ ǒ ) Ǔ ^{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 |
|ZKA|
1
R1
R2
MOTOROLA ANALOG IC DEVICE DATA
3