ꢀ ꢁꢂ ꢃ ꢄ ꢅ ꢀ ꢁꢂ ꢃ ꢄ ꢆꢅ ꢀ ꢁꢂ ꢃ ꢄ ꢇꢅ ꢀ ꢁꢂ ꢃ ꢈ ꢅ ꢀ ꢁꢂ ꢃ ꢈ ꢆ ꢅ ꢀꢁ ꢂꢃ ꢈꢇ
ꢆꢉꢊ ꢋꢌ ꢀꢆꢇꢁ ꢍ ꢎꢏ ꢍꢐꢑꢌ ꢑꢒ ꢓ ꢌꢔꢋ ꢓꢀ ꢏꢍ ꢕ ꢋꢁ ꢆꢀꢒ ꢏꢌ
SLVS543A – AUGUST 2004 − REVISED AUGUST 2004
APPLICATION INFORMATION
IN
OUT
V
LM317
V
O
≈5 V, 1.5 A
I(BATT)
Adjust
8.2 kΩ
243 Ω
0.1%
TL431
243 Ω
0.1%
Figure 23. Precision 5-V 1.5-A Regulator
V
V
O
≈5 V
I(BATT)
R
b
(see Note A)
27.4 kΩ
0.1%
TL431
27.4 kΩ
0.1%
NOTE A: R should provide cathode current ≥1 mA to the TL431.
b
Figure 24. Efficient 5-V Precision Regulator
12 V
V
CC
6.8 kΩ
10 kΩ
5 V
−
10 kΩ
0.1%
+
TL598
X
Not
TL431
Used
10 kΩ
0.1%
Feedback
Figure 25. PWM Converter With Reference
25
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
