LM317
3-TERMINAL ADJUSTABLE REGULATOR
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SLVS044R–SEPTEMBER 1997–REVISED APRIL 2007
APPLICATION INFORMATION (continued)
R
S
0.2 Ω
(see Note A)
LM317
INPUT OUTPUT
V
I
R1
ADJUST
240 Ω
R2
2.4 kΩ
NOTE A:
R
controls the output impedance of the charger.
R2
S
ǒ1 )
Ǔ
ZOUT + RS
R1
The use of R allows for low charging rates with a fully charged battery.
S
Figure 8. Battery-Charger Circuit
LM317
24 Ω
V
I
INPUT
OUTPUT
ADJUST
Figure 9. 50-mA Constant-Current Battery-Charger Circuit
LM317
INPUT
OUTPUT
V
O
= 15 V
V
I
R1
240 Ω
D1
1N4002
ADJUST
R3
50 kΩ
R2
2.7 kΩ
2N2905
C1
25 µF
Figure 10. Slow Turn-On 15-V Regulator Circuit
10
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