![]() ![]() The discussed LM317 configuration is so accurate that it becomes ideally suitable for all such specialist current and voltage regulated applications. Steven Chiverton and used for driving special laser diodes which are known to have stringent operating specifications, and could be driven only through specialized driver circuits. The idea was built and tested by one of the avid readers of this blog Mr. Our versatile IC LM317/338/396 may be used as an adjustable voltage and current regulator through simple configurations. LM317 Variable Voltage, Current Regulator The diagram below shows how the IC 317 can be used for producing more than 3 amps of current. The IC can be further enhanced for producing currents higher than its rated values. Enhancing with High Current Output Facility The 5K pot is used for adjusting the voltage, whereas the 1 Ohm current sensing resistor is selected appropriately to acquire the desired current limit. The figure above shows, how the IC LM317 can be effectively used for producing variable voltages and currents, as desired by the user. Though the shown design is the simplest one and therefore includes only a voltage control feature, a current control feature can also be included with the IC. How to Connect LM317 in a Adjustable Voltage Power Supply DesignĪs can be seen the diagram, the assembly needs hardly any components and is in fact a child’s play to get everything in place.Īdjusting the pot produces a linearly varying voltage at the output that may be right from 1.25 volts to the maximum level supplied at the input of the Ic. The output is received from the “out” pin of the IC while the voltage setting components are connected around the adjustment pin. ![]() The input pin is applied with a rectified DC input, preferably with the maximum tolerable input, that’s 24 volts as per the specs of the IC. The pin outs are very easy to understand, since it consists of an input, an output and an adjustment pins that just needs to be wired up with the relevant connections. This IC is normally available in TO-220 package and has three pin outs. Here we’ll try to understand how to construct a simplest power supply circuit using the IC LM317. How to Use LM317 for Producing a Variable Output With the advent of chips or ICs like LM317, L200, LM338, LM723, configuring power supply circuits with variable voltage output with the above exceptional qualities has become very easy nowadays.
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