Datasheet

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V
(BATT)
In
Out
V
O
TL1431
Common
µA7805
R1
R2
V +
ǒ
1 )
R1
R2
Ǔ
V
I(ref)
Min V = V
I(ref)
+ 5 V
NOTE A: R should provide cathode current ≥1 mA to the TL1431 at
minimum V
(BATT).
V
(BATT)
R
30 Ω
TL1431
2N2222
2N2222
0.01 µF
4.7 kΩ
R1
0.1%
R2
0.1%
V
O
V
O
+
ǒ
1 )
R1
R2
Ǔ
V
I(ref)
V
(BATT)
TL1431
V
O
+
ǒ
1 )
R1
R2
Ǔ
V
I(ref)
R1
R2
R
V
O
NOTE A: Refer to the stability boundary conditions in Figure 15 to
determine allowable values for C.
V
(BATT)
V
O
TL1431
R1
R2
C
V
trip
+
ǒ
1 )
R1
R2
Ǔ
V
I(ref)
LM317
In Out
V
(BATT)
8.2 kΩ
TL1431
Adjust
243 Ω
0.1%
243 Ω
0.1%
V
O
= 5 V, 1.5 A, 0.5%
NOTE A: R
b
should provide cathode current ≥1 mA to the TL1431.
V
(BATT)
V
O
= 5 V
R
b
TL1431
27.4 kΩ
0.1%
27.4 kΩ
0.1%
TL1431-EP
PRECISION PROGRAMMABLE REFERENCE
SLVS529C – APRIL 2004 – REVISED DECEMBER 2006
Figure 18. Precision High-Current Series Regulator Figure 19. Output Control of a
Three-Terminal Fixed Regulator
Figure 20. Higher-Current Shunt Regulator Figure 21. Crowbar
Figure 22. Precision 5-V, 1.5-A, 0.5% Regulator Figure 23. Precision Regulator
13
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