TL431-Q1 Datasheet, PDF (15/26 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
LM317
8.2 kΩ ^Adjust
V_O ≈5 V, 1.5 A
243 Ω
0.1%
TL431
243 Ω
0.1%
Figure 23. Precision 5-V 1.5-A Regulator
V_I(BATT)
R_b
(see Note A)
TL431
V_O ≈5 V
27.4 kΩ
0.1%
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
6.8 kΩ
5V
10 kΩ
10 kΩ
0.1%
10 kΩ
0.1%
12 V
V_CC
X
Not
Used
−
+
TL598
Feedback
Figure 25. PWM Converter With Reference
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