TL1431 Datasheet, PDF (13/28 Pages) STMicroelectronics – PROGRAMMABLE VOLTAGE REFERENCE

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V_(BATT)
R
30 Ω
2N2222
2N2222
TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062L – DECEMBER 1991 – REVISED OCTOBER 2007
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)
A. R should provide cathode current ≥1 mA to
the TL1431 at minimum V_(BATT).
Figure 18. Precision High-Current Series Regulator
R
V_(BATT)
V_O
R1
R2
TL1431
ǒ Ǔ VO +
1
)
R1
R2
VI(ref)
Figure 20. Higher-Current Shunt Regulator
In
Out
V_(BATT)
LM317
V_O = 5 V, 1.5 A, 0.5%
8.2 kΩ
TL1431
Adjust
243 Ω
0.1%
243 Ω
0.1%
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
V_(BATT)
V_O
R1
TL1431
C
R2
ǒ Ǔ Vtrip +
1
)
R1
R2
VI(ref)
A. Refer to the stability boundary conditions in
Figure 15 to determine allowable values for
C.
Figure 21. Crowbar
V_(BATT)
V_O = 5 V
R_b
TL1431
27.4 kΩ
0.1%
27.4 kΩ
0.1%
Figure 22. Precision 5-V, 1.5-A, 0.5% Regulator
A. R_b should provide cathode current ≥1 mA to
the TL1431.
Figure 23. 5-V Precision Regulator
Copyright © 1991–2007, Texas Instruments Incorporated
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