TL1431-SP Datasheet, PDF (8/13 Pages) Texas Instruments – CLASS V, PRECISION PROGRAMMABLE REFERENCE

TL1431-SP
SLVSB44 – JULY 2012
R
V_(BATT)
V_O
R1
R2
TL1431
ǒ Ǔ VO +
1
)
R1
R2
VI(ref)
Figure 20. 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%
V_(BATT)
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V_O
R1
TL1431
C
R2
ǒ Ǔ Vtrip +
1
)
R1
R2
VI(ref)
Figure 21. Crowbar
V_(BATT)
R_b
TL1431
V_O = 5 V
27.4 kΩ
0.1%
27.4 kΩ
0.1%
Figure 22. Precision 5-V, 1.5-A, 0.5% Regulator
Figure 23. 5-V Precision Regulator
12 V
6.8 kΩ
5 V +0.5%
TL1431
10 kΩ
10 kΩ
0.1%
10 kΩ
0.1%
X
Not
Used
V_CC
−
+
TL598
Feedback
Figure 24. PWM Converter With 0.5% Reference
A. Select R3 and R4 to provide the desired LED intensity and cathode current ≥1 mA to the TL1431.
8
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