LM317 Current Calculator
LM317 Current Calculator
A handy online output current calculator for the LM317, LM338, and other linear voltage regulators
electric circuit | electronics | generalIn our article
Using the LM317 with LED Lighting we looked at how the
LM317T (and high current equivalent
LM338T) can be used to supply a
fixed current to a load - in the case of the article to LED bulbs.
The output
current from the circuit shown above is set using a single
resistor according to the following equation:
|
Resistor Required (Ohms) = 1.25 (Volts) / nominal LED current (Amps)
|
Do not forget that the maximum
continuous current which can be managed by the LM317T is
1.5 Amps, and that is with a decent
heatsink fitted. The LM338T is rated at
5 Amps of continuous current with 50ms bursts of up to 7 Amps. However with a large heatsink it is possible to manage continuous currents of 8 Amps+.
LM317/LM338 Voltage Calculator
If you would like to use the
LM317T or
LM338T to output a fixed voltage rather than current, click here to visit our
LM317 Voltage Calculator.
Article Last Modified: 12:47, 12th Mar 2008
Recommended Related Articles
People who read this article also enjoyed the following articles:
Using The LM317T With LED LightingUse an LM317T to regulate the current in LED lighting projects
Article Last Modified: 12:47, 12th Mar 2008lighting | electric circuitLM317 Voltage CalculatorA handy online output voltage calculator for the LM317, LM338, and other linear voltage regulators
Article Last Modified: 12:47, 12th Mar 2008electric circuit | electronics | generalLM317T Voltage Regulator ChipLearn about the LM317T and its uses in renewable energy projects
Article Last Modified: 09:34, 30th Mar 2007electronics | electric circuitUsing The LM317T To Regulate VoltageUse an LM317T to regulate voltage in renewable energy projects
Article Last Modified: 15:04, 7th Mar 2008electric circuit | electronicsSolar Battery Charger With LM317TFind out how to make a current controlled solar battery charger using an LM317T
Article Last Modified: 09:34, 30th Mar 2007solar | education | electric circuitMake a Simple Battery Status MonitorMonitor battery status with this easy electric circuit project - no skill required!
Article Last Modified: 12:33, 16th Mar 2007storage | electric circuitHow To Make MR16 LED SpotlightsFind out how to make your own LED spotlight bulbs
Article Last Modified: 10:43, 10th Feb 2007lighting | educationResistor Colour CodesLearn how to identify different resistors with their colour code
Article Last Modified: 14:19, 22nd Feb 2007electric circuit | educationLM741 OpAmp Voltage IndicatorPlans for a simple voltage high/low indicator built around an LM741 operational amplifier
Article Last Modified: 09:31, 8th Oct 2007electronics | electric circuit | general12 Volt Battery Low Indicator LM741Plans for a battery low indicator for a 12 Volt battery using an LM741 operational amplifier
Article Last Modified: 10:17, 28th Jul 2007electronics | electric circuit | general
|
|
£39.99 
