TL1431-Q1 Datasheet, PDF (12/19 Pages) Texas Instruments – PRECISION PROGRAMMABLE REFERENCE

TL1431ĆQ1
PRECISION PROGRAMMABLE REFERENCE
SLVS534B − JUNE 2004 − REVISED APRIL 2008
APPLICATION INFORMATION
V(BATT)
R
30 Ω
2N2222
2N2222
V(BATT)
In
µA7805 ^Out
VO
Common
R1
TL1431
0.01 µF
4.7 kΩ
VO
R2
0.1%
R1
0.1%
ǒ Ǔ VO +
1
)
R1
R2
VI(ref)
NOTE A: R should provide cathode current ≥1 mA to the TL1431 at
minimum V(BATT).
Figure 18. Precision High-Current Series Regulator
TL1431
R2
ǒ Ǔ V +
1
)
R1
R2
VI(ref)
Min V = VI(ref) + 5 V
Figure 19. Output Control of a
Three-Terminal Fixed Regulator
R
V(BATT)
VO
R1
R2
TL1431
ǒ Ǔ VO +
1
)
R1
R2
VI(ref)
Figure 20. Higher-Current Shunt Regulator
V(BATT)
VO
R1
TL1431
C
R2
ǒ Ǔ Vtrip +
1
)
R1
R2
VI(ref)
NOTE A: Refer to the stability boundary conditions in Figure 15 to
determine allowable values for C.
Figure 21. Crowbar
12
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