TL431, TL431A, TL431B
TL432, TL432A, TL432B
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SLVS543M –AUGUST 2004–REVISED JULY 2012
V
I(BATT)
R
2N222
(see Note A)
2N222
30 Ω
4.7 kΩ
0.01 µF
TL431
V
O
R1
0.1%
R2
R1
R2
æ
ö
V
=
1 +
V
ref
O
ç
÷
0.1%
è
ø
A. R should provide cathode current ≥1 mA to the TL431 at minimum V(BATT)
.
Figure 22. Precision High-Current Series Regulator
V
I(BATT)
IN
OUT
uA7805
V
O
Common
TL431
R1
R2
R1
V
1
V
ref
=
+
(
(
O
+
Vref 5 V
Minimum V
=
O
R2
Figure 23. Output Control of a Three-Terminal Fixed Regulator
V
V
O
I(BATT)
R1
R2
R1
V
1
V
(
ref
=
+
(
O
TL431
R2
Figure 24. High-Current Shunt Regulator
V
I(BATT)
V
O
R1
TL431
C
(see Note A)
R2
A. Refer to the stability boundary conditions in Figure 18 and Figure 19 to determine allowable values for C.
Figure 25. Crowbar Circuit
Copyright © 2004–2012, Texas Instruments Incorporated
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