TL1431-SP Datasheet, PDF (7/13 Pages) Texas Instruments – CLASS V, PRECISION PROGRAMMABLE REFERENCE

TL1431-SP
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APPLICATION INFORMATION
SLVSB44 – JULY 2012
A. R should provide cathode current ≥1 mA to the TL1431 at minimum V_(BATT).
V_(BATT)
R
R1
0.1%
V_I(ref)
R2
0.1%
V_O
TL1431
Input
V_(BATT)
V_O
V_on ≈ 2 V
V_off ≈ V_(BATT)
TL1431
ǒ Ǔ VO +
1
)
R1
R2
VI(ref)
V_IT = 2.5 V
GND
Figure 16. Shunt Regulator
Figure 17. Single-Supply Comparator With
Temperature-Compensated Threshold
A. R should provide cathode current ≥1 mA to the TL1431 at minimum V_(BATT).
V_(BATT)
R
30 Ω
2N2222
2N2222
V_(BATT)
In
µA7805 ^Out
V_O
Common
R1
TL1431
0.01 µF
4.7 kΩ
V_O
R2
0.1%
R1
0.1%
ǒ Ǔ VO +
1
)
R1
R2
VI(ref)
Figure 18. Precision High-Current Series Regulator
TL1431
R2
ǒ Ǔ V +
1
)
R1
R2
VI(ref)
Min V = V_I(ref) + 5 V
Figure 19. Output Control of a Three-Terminal
Fixed Regulator
A. Refer to the stability boundary conditions in Figure 15 to determine allowable values for C.
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