Navigation: DIY Audio Projects / Technical Audio and Reference Information / LM317 / LM338 / LM350 Current Regulator Calculator and Circuits

LM317 / LM338 / LM350 Current Regulator Calculator


LM317 / LM338 / LM350 Current Regulator Calculator

You can use this Current Regulator Calculator to vary the value of the program resistor (R1) and calculate the output current from the LM317 / LM338 / LM350 family of three terminal adjustable regulators. This Current Regulator Calculator will work for all adjustable integrated circuit regulators with a reference voltage (VREF) of 1.25. For more information about these voltage regulators, see the LM317 / LM338 / LM350 Voltage Regulator Calculator, Information and Circuits page.

LM317 / LM338 / LM350 Current Regulator Calculator Schematic

Figure 2: LM317 / LM338 / LM350 Current Regulator Calculator Schematic

LM317 / LM338 / LM350 Current Regulator Calculator

To determine the output current from the regulator, enter a value for the program resistor (R1) in ohms and press the "Calculate" button. This will calculate the Output Current in Amperes and the amount of Power Dissipated across R1 in Watts.

NOTE: this online current regulator calculator requires that JavaScript be enabled on your browser.

R1
[ohms]
Output Current
[Amperes]
Power Dissipated
[Watts]

LM317 / LM338 / LM350 Current Regulator Calculator

 UPDATE  - the LM317 / LM338 / LM350 voltage regulator calculator has been moved to it's own page, LM317 / LM338 / LM350 Voltage Regulator Calculator. Please update your bookmarks.


Datasheets - LM317 / LM338 / LM350 3-Terminal Adjustable Regulator


LM317 / LM338 / LM350 Current Regulator Circuits

The following circuits show some of the basic uses of the LM317 / LM338 / LM350 series of voltage regulators when configured as a current regulator or constant current source (CCS).

1 Amp Current Regulator Schematic for LM317 / LM338 / LM350

Figure 2: 1 Amp Current Regulator Schematic for LM317 / LM338 / LM350

Precision Current Limiter Schematic Circuit for LM317 / LM338 / LM350

Figure 3: Precision Current Limiter Schematic for LM317 / LM338 / LM350

50mA Constant Current Battery Charger Schematic for LM317

Figure 4: 50mA Constant Current Battery Charger Schematic for LM317


Voltage Regulator Links