Datasheet

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