TL431B Datasheet, PDF (25/40 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
VI(BATT)
IN
OUT
LM317
8.2 kΩ ^Adjust
VO ≈5 V, 1.5 A
243 Ω
0.1%
TL431
243 Ω
0.1%
Figure 23. Precision 5-V 1.5-A Regulator
VI(BATT)
Rb
(see Note A)
TL431
VO ≈5 V
27.4 kΩ
0.1%
27.4 kΩ
0.1%
NOTE A: Rb 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
X
Not
Used
VCC
−
+
TL598
Feedback
Figure 25. PWM Converter With Reference
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