TL1431_12 Datasheet, PDF (10/27 Pages) Texas Instruments – PRECISION PROGRAMMABLE REFERENCE

TL1431
SLVS062M – DECEMBER 1991 – REVISED APRIL 2012
V_(BATT)
R
30 Ω
2N2222
2N2222
V_(BATT)
In
µA7805 ^Out
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V_O
Common
R1
TL1431
0.01 µF
4.7 kΩ
V_O
R2
0.1%
R1
0.1%
TL1431
R2
ǒ Ǔ VO +
1
)
R1
R2
VI(ref)
ǒ Ǔ V +
1
)
R1
R2
VI(ref)
Min V = V_I(ref) + 5 V
Figure 21. Precision High-Current Series Regulator
Figure 22. Output Control of a Three-Terminal
Fixed Regulator
A. Refer to the stability boundary conditions in Figure 18 to determine allowable values for C.
R
V_(BATT)
V_O
V_(BATT)
V_O
R1
R1
TL1431
R2
TL1431
ǒ Ǔ VO +
1
)
R1
R2
VI(ref)
Figure 23. Higher-Current Shunt Regulator
A. R_b should provide cathode current ≥1 mA to the TL1431.
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%
C
R2
ǒ Ǔ Vtrip +
1
)
R1
R2
VI(ref)
Figure 24. Crowbar
V_(BATT)
R_b
TL1431
V_O = 5 V
27.4 kΩ
0.1%
27.4 kΩ
0.1%
Figure 25. Precision 5-V, 1.5-A, 0.5% Regulator
Figure 26. 5-V Precision Regulator
10
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