R1

240 W

R2

2.4 kW

INPUT

OUTPUT

ADJUST

LM317

0.2 W

INPUT

OUTPUT

ADJUST

LM317

INPUT

OUTPUT

ADJUST

LM317

INPUT

OUTPUT

ADJUST

LM317

R1

120 W

R2

1 kW

R1

1.2 k

Ω

R2

20 k

Ω

INPUT

OUTPUT

ADJUST

LM317

LM317

www.ti.com

SLVS044W – SEPTEMBER 1997 – REVISED OCTOBER 2014

System Examples (continued)

9.3.5 1.25-V to 20-V Regulator Circuit With Minimum Program Current

R2. The size of R2 determines the IR drop from ADJUSTMENT to GND. Higher values of R2 translate to higher

Figure 16. 1.25-V to 20-V Regulator Circuit With Minimum Program Current

9.3.6 Adjusting Multiple On-Card Regulators With a Single Control

With different values of R1 for each LM317, R2 can be chosen such that each LM317 outputs a different voltage.

Figure 17. Adjusting Multiple On-Card Regulators With a Single Control

9.3.7 Battery-Charger Circuit

The series resistor limits the current output of the LM317, minimizing damage to the battery cell.

Figure 18. Battery-Charger Circuit

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