LM317
3-TERMINAL ADJUSTABLE REGULATOR
SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001
APPLICATION INFORMATION
LM317
VI
INPUT
OUTPUT
VO
R1
1.2 kΩ
ADJUST
R2
20 kΩ
Figure 6. 1.2-V to 20-V Regulator Circuit With Minimum Program Current
LM317
VI
INPUT
OUTPUT
VO†
R1
120
Ω
VI
LM317
INPUT
OUTPUT
VO†
VI
LM317
INPUT
OUTPUT
VO†
ADJUST
ADJUST
ADJUST
R2
1 kΩ
† Minimum load current from each output is 10 mA. All output voltages are within 200 mV of each other.
Figure 7. Adjusting Multiple On-Card Regulators With a Single Control
LM317
VI
INPUT
OUTPUT
RS
0.2
Ω
(see Note A)
R1
240
Ω
ADJUST
R2
2.4 kΩ
NOTE A: RS controls the output impedance of the charger.
Z
OUT
R
S
1 R2
R1
The use of RS allows for low charging rates with a fully charged battery.
+
)
Figure 8. Battery-Charger Circuit
6
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
