TL431B Datasheet, PDF (23/40 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
R
(see Note A)
VI(BATT)
R1
0.1%
Vref
R2
0.1%
VO
TL431
ǒ Ǔ VO +
1
)
R1
R2
V_ref
RETURN
NOTE A: R should provide cathode current ≥1 mA to the TL431 at minimum VI(BATT).
Figure 17. Shunt Regulator
VI(BATT)
TL431
Input
VIT ≈ 2.5 V
VO
Von ≈2 V
Voff ≈VI(BATT)
GND
Figure 18. Single-Supply Comparator With Temperature-Compensated Threshold
VI(BATT)
TL431
R
(see Note A)
2N222
30 Ω
0.01 µF
R2
0.1%
R1
0.1%
4.7 kΩ
2N222
ǒ Ǔ VO +
1
)
R1
R2
V_ref
VO
NOTE A: R should provide cathode current ≥1 mA to the TL431 at minimum VI(BATT).
Figure 19. Precision High-Current Series Regulator
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