Datasheet

TL431−Q1
ADJUSTABLE PRECISION SHUNT REGULATOR
SGLS302D − MARCH 2005 − REVISED MARCH 2013
15
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
V
O
≈5 V, 1.5 A
TL431
V
I(BATT)
LM317
IN
OUT
Adjust
243 Ω
0.1%
243 Ω
0.1%
8.2 kΩ
Figure 23. Precision 5-V 1.5-A Regulator
V
O
≈5 V
TL431
V
I(BATT)
27.4 kΩ
0.1%
R
b
(see Note A)
27.4 kΩ
0.1%
NOTE A: R
b
should provide cathode current ≥1 mA to the TL431.
Figure 24. Efficient 5-V Precision Regulator
TL431
12 V
V
CC
5 V
6.8 kΩ
10 kΩ
10 kΩ
0.1%
10 kΩ
0.1%
X
Not
Used
Feedback
TL598
+
−
Figure 25. PWM Converter With Reference