TL431-Q1 Datasheet, PDF (13/26 Pages) Texas Instruments – ADJUSTABLE PRECISION SHUNT REGULATOR

TL431−Q1
ADJUSTABLE PRECISION SHUNT REGULATOR
SGLS302D − MARCH 2005 − REVISED MARCH 2013
APPLICATION INFORMATION
R
(see Note A)
V_I(BATT)
R1
0.1%
V_ref
R2
0.1%
V_O
TL431
ǒ Ǔ VO +
1
)
R1
R2
V_ref
RETURN
NOTE A: R should provide cathode current ≥1 mA to the TL431 at minimum V_I(BATT).
Figure 17. Shunt Regulator
V_I(BATT)
TL431
Input
V_IT ≈ 2.5 V
V_O
V_on ≈2 V
V_off ≈V_I(BATT)
GND
Figure 18. Single-Supply Comparator With Temperature-Compensated Threshold
V_I(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
V_O
NOTE A: R should provide cathode current ≥1 mA to the TL431 at minimum V_I(BATT).
Figure 19. Precision High-Current Series Regulator
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