Lm317 Adjustable Current Limiter Circuit

The lm317 ic helps in current limiting thermal overload protection and safe operating area protection. 3d biometrics hyperspectral imaging. Lm317 3 terminal adjustable regulator 1 1 features 1 output voltage range adjustable from 1 25 v to 37 v output current greater than 1 5 a internal short circuit current limiting thermal overload protection output safe area compensation 2 applications atca solutions dlp.

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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.

Lm317 adjustable current limiter circuit.

It can supply greater than 1 5 a at the output. This is also a pb free device. A constant current circuit can also be used as a current limiter. To be precise the upper lm317 forms the current regulator stage while the lower acts like a voltage controller stage.

It s having a typical line and load regulation of 0 1. Precision current limiter schematic for lm317 lm338 lm350. As you determined in your op there s a problem using a variable resistor in a current source mode because all the current goes through the variable resistor. This circuit addresses that problem.

Constant current portion of the lm317 based power supply with current limiting. Lm317 is a positive voltage regulator with an adjustable voltage range from 1 25 v to 37 v. Lm317 can also be used to design various other circuits like 0 v to 30 v regulator circuit adjustable regulator circuit with improved ripple rejection precision current limiter circuit tracking pre regulator circuit 1 25 v to 20 v regulator circuit with minimum program current adjustable multiple on card regulators with single control. 1 amp current regulator schematic for lm317 lm338 lm350.

A constant current source ccs in electronics is a device circuit that produces a constant value of current regardless of source voltage or load resistance. Also see lm317 high power constant current source circuit. It can also provide float operation for high voltage application. If we disconnect the adjustable terminal still lm317 will helpful in overload protection.

The input supply source is connected across the vin and ground of the upper current regulator circuit the output from this stage goes to the input of the lower lm317 variable voltage regulator stage. In most of the applications due to irregular loads the output voltage produced has fluctuations in it which can lead to damaging loads.

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