TL431_10 Datasheet, PDF (29/75 Pages) Texas Instruments – PRECISION PROGRAMMABLE REFERENCE

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TL431, TL431A, TL431B
TL432, TL432A, TL432B
SLVS543K – AUGUST 2004 – REVISED JUNE 2010
V_I(BATT)
R
(see Note A)
30 Ω
2N222
2N222
TL431
0.01 µF
R2
0.1%
R1
0.1%
4.7 kΩ
V_O
V_O
=
æ
çè^{1 +}
R1 ö
R2 ^÷ø
V_ref
A. R should provide cathode current ≥1 mA to the TL431 at minimum V_(BATT).
Figure 19. Precision High-Current Series Regulator
V_I(BATT)
IN
uA7805
Common
TL431
OUT
V_O
R1
R2
( ^{VO =}
1+
R1
R2
V_ref
Minimum VO ₌ V_ref + 5 V
Figure 20. Output Control of a Three-Terminal Fixed Regulator
V_I(BATT)
R1
V_O
( ^{VO =}
1+
R1
R2
V_ref
R2
TL431
Figure 21. High-Current Shunt Regulator
V_I(BATT)
R1
TL431
R2
V_O
C
(see Note A)
A. Refer to the stability boundary conditions in Figure 15 and Figure 16 to determine allowable values for C.
Figure 22. Crowbar Circuit
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