☑ Lm317 Protection Diodes

The indicated protection diodes are actually not required because its job is to protect the ic if a short circuit is made from the input side of the ic with a high value charged capacitor connected at the output side. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage.

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Lm317lm338 ics are internally protected from short circuit overload current and from over heating thermal protection so it is virtually indestructible.

Lm317 protection diodes. The nominal output voltage is selected by means of a resistive divider making the. The lm317 will be damaged if the vout exceeds vin by more than a volt or so. The lm317 lm338 lm350 family of adjustable 3 terminal positive voltage regulators can take a input of 3 to 40 volts dc and provide a regulated voltage over a 12v to 37v output range.

National semi invented the lm317 so you should look at their datasheet where everything is explained in english with details. They are designed to supply more than 15 a of load current with an output voltage adjustable over a 12 to 37 v range. So lm317 regulator is easy to use and assemble in a circuit.

Make a power supply using lm317 the lm317 is an adjustable three terminal positive voltage regulator capable of supplying more than 15 a over an output voltage range of 125 v to 37 v. National semi explains the function of c2 and the functions of the diodes on their dsatasheet. In this project an adjustable power supply using lm317 is designed which inputs main ac supplies 220v 230v ac and outputs dc voltage below 12v.

It is exceptionally easy to use and requires only two external resistors to set the output voltage. The lm217 lm317 are monolithic integrated circuits in to 220 to 220fp and d2pak packages intended for use as positive adjustable voltage regulators. The lm317 voltage regulators can provide up to 15 amperes a of output current.

A common method is to connect say a 1amp diode in reverse parallel across the lm317. Regulator ic lm317 adjust pin connected with variable resistor and output through feedback resistor r1. At the output diode d2 provides reverse voltage protection.

So the maximum reverse voltage across the lm317 will be clamped at 07v. The lm317 has an adjustable output voltage of 128 v to 11 v and draws maximum 15 a current. Diode cathode to vin side of lm317 and anode to vout.

Lm317 regulates input dc supply from rectifier and takes feedback from output through d1 and adjustable pin takes feedback voltage and current through variable resistor and r1 resistor. Lm317d lm317 ncv317 voltage regulator adjustable output positive 15 a the lm317 is an adjustable 3terminal positive voltage regulator capable of supplying in excess of 15 a over an output voltage range of 12 v to 37 v.