Datasheet

TL431−Q1
ADJUSTABLE PRECISION SHUNT REGULATOR
SGLS302D − MARCH 2005 − REVISED MARCH 2013
13
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
R1
0.1%
R2
0.1%
R
(see Note A)
V
ref
V
O
TL431
V
I(BATT)
RETURN
NOTE A: R should provide cathode current ≥1 mA to the TL431 at minimum V
I(BATT)
.
V
O
+
ǒ
1 )
R1
R2
Ǔ
V
ref
Figure 17. Shunt Regulator
V
O
TL431
V
I(BATT)
V
IT
≈ 2.5 V
GND
Input
V
on
≈2 V
V
off
≈V
I(BATT)
Figure 18. Single-Supply Comparator With Temperature-Compensated Threshold
R
(see Note A)
V
O
TL431
V
I(BATT)
2N222
2N222
4.7 kΩ
R1
0.1%
R2
0.1%
0.01 μF
30 Ω
V
O
+
ǒ
1 )
R1
R2
Ǔ
V
ref
NOTE A: R should provide cathode current ≥1 mA to the TL431 at minimum V
I(BATT)
.
Figure 19. Precision High-Current Series Regulator