TL431 Datasheet, PDF (4/16 Pages) Motorola, Inc – PROGRAMMABLE PRECISION REFERENCES

TL431, A, B Series
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)
VKA = Vref, IK = 10 mA
TA = 25°C
TA = Tlow to Thigh
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)
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
V
2.47 2.495 2.52 2.47 2.495 2.52 2.483 2.495 2.507
2.44 – 2.55 2.453 – 2.537 2.475 2.495 2.515
∆Vref
–
7.0
–
–
3.0
–
–
3.0
–
mV
DVref
DVKA
mV/V
– –1.4 –2.7 – –1.4 –2.7 – –1.4 –2.7
– –1.0 –2.0 – –1.0 –2.0 – –1.0 –2.0
∆Iref
µA
– 1.8 4.0 –
1.8 4.0
–
1.1 2.0
–
– 6.5 –
–
5.2
–
– 4.0
∆Iref
– 0.8 2.5 –
0.4 1.2
–
0.4 1.2 µA
Imin
– 0.5 1.0 –
0.5 1.0
–
0.5 1.0 mA
Ioff
– 260 1000 – 260 1000 – 230 500 nA
|ZKA| – 0.22 0.5 – 0.22 0.5
– 0.14 0.3 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
4
MOTOROLA ANALOG IC DEVICE DATA