TL431-Q1 Datasheet, PDF (14/26 Pages) Texas Instruments – ADJUSTABLE PRECISION SHUNT REGULATOR

TL431−Q1
ADJUSTABLE PRECISION SHUNT REGULATOR
SGLS302D − MARCH 2005 − REVISED MARCH 2013
APPLICATION INFORMATION
V_I(BATT)
IN
OUT
uA7805
Common
TL431
V_O
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
V_I(BATT)
R1
R2
TL431
V_O
ǒ Ǔ VO +
1
)
R1
R2
V_ref
Figure 21. High-Current Shunt Regulator
V_I(BATT)
R1
TL431
R2
V_O
C
(see Note A)
NOTE A: See the stability boundary conditions in Figure 16 to determine allowable values for C.
Figure 22. Crowbar Circuit
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