TL431B Datasheet, PDF (24/40 Pages) Texas Instruments – ADJUSTABLE PRECISION SHUNT REGULATORS

TL431, TL431A, TL431B, TL432, TL432A, TL432B
ADJUSTABLE PRECISION SHUNT REGULATORS
SLVS543A – AUGUST 2004 − REVISED AUGUST 2004
APPLICATION INFORMATION
VI(BATT)
IN
uA7805
Common
TL431
OUT
VO
R1
R2
ǒ Ǔ VO +
1
)
R1
R2
V_ref
Minimum VO + V_ref ) 5 V
Figure 20. Output Control of a Three-Terminal Fixed Regulator
VI(BATT)
R1
R2
TL431
VO
ǒ Ǔ VO +
1
)
R1
R2
V_ref
Figure 21. High-Current Shunt Regulator
VI(BATT)
R1
TL431
R2
VO
C
(see Note A)
NOTE A: Refer to the stability boundary conditions in Figure 16 to determine allowable values for C.
Figure 22. Crowbar Circuit
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