Lm317 Circuit

April 21, 2024 Post a Comment

Lm317 circuit

The LM317 serves a wide variety of applications including local, on card regulation. This device can also be used to make a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM317 can be used as a precision current regulator.

How do you use a LM317 regulator?

Let's make our 1 510 ohms and let's use a 10 kilo ohm variable resistor for r2. Doing this gives us

Is LM317 a transistor?

Zigshash LM317 IC Adjustable Voltage Regulator FET Transistor (Number of Transistors 4)

Is LM317 a linear voltage regulator?

The LM317 is a popular adjustable positive linear voltage regulator. It was designed by Bob Dobkin in 1976 while he worked at National Semiconductor.

How do you wire a LM317?

The wiring steps are as follows:

Connect the LM317 to the breadboard.
Connect the 10 uF capacitor with the IN pin.
Connect the 100 uF capacitor with the OUT pin.
Connect the IN with the plus terminal of the power source.
Connect the 1k Ohm resistor with the OUT and ADJ pins.

What are the 3 types of power supply?

There are three subsets of regulated power supplies: linear, switched, and battery-based. Of the three basic regulated power supply designs, linear is the least complicated system, but switched and battery power have their advantages.

Can LM317 boost voltage?

In this article, I will discuss two methods of LM317 current boosting, using power PNP and NPN pass transistors. According to the LM317 datasheet: “The LM317 [1, 2] device is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V.

How do you calculate the output voltage of LM317?

Using the formula for the output voltage, VOUT= 1.25V (1 + R2/R1). Being that R1=240Ω, our equation is now 5V= 1.25V (1 + R2/240Ω), so R2=720Ω. So with R2 being a value of 720Ω, the LM317 will output 5V if fed an input voltage greater than 5 volts.

What is the equivalent of LM317?

Replacement and Equivalent / Other Part Numbers LM117, LM217, LM1086-ADJ, LT1086-ADJ, LT1117-ADJ, B29150, LM338, LM1084-ADJ. Some ICs may have different pin configuration from LM317, therefore check pin configuration before using in a circuit.

What is the input voltage of LM317?

LM317 is an adjustable voltage regulator that takes an input voltage of 3 - 40V DC and provides a fixed output voltage of 1.25V to 37V DC. It requires two external resistors to adjust the output voltage.

Who invented LM317?

It is invented by Robert. c. Dobkin and Robert J. Wildar in the year1970.it is a positive voltage regulator capable of supplying in excess of 1.5A over an output voltage range of 1.2V to 37V.

How do you increase current capacity of LM317?

The popular LM317 voltage regulator IC is designed to deliver not more than 1.5 amps, however by adding an outboard current boost transistor to the circuit it becomes possible to upgrade the regulator circuit to handle much higher currents, and upto any desired levels.

Does LM317 need heatsink?

LM317 needs a heatsink for anything above 0.5W.

What does LM stand for in electronics?

The prefix LM stands for linear monolithic, referring to the analog components integrated onto a single piece of silicon. Because of the popularity of these parts, many of them were second-sourced by other manufacturers who kept the sequence number as an aid to identification of compatible parts.

How can DC current be regulated?

Resistors are electrical devices that restrict the flow of electrical current through a circuit. Resistors can be used for several functions, such as voltage isolation or setting a limit for how much current flows through the circuit. Using resistors for either function allows the power of the circuit to be regulated.

How do you control voltage in a circuit?

Methods of voltage control in power system

Using excitation control or voltage regulators at generating stations.
By using tap changing transformers.
Using induction regulators.
By using shunt reactors.
By using shunt capacitors.
Using synchronous condensers.

How do you control voltage output?

The power supply output voltage can be changed by either changing the scaling factor of the feedback voltage, injecting a trimming signal into the feedback node, or changing the reference voltage.

How do you regulate voltage?

One of the simplest ways to regulate voltage is with a Zener diode. While linear regulators are usually basic in design, a Zener diode provides adequate voltage regulation in a single component.

What is the maximum DC voltage?

The maximum voltage in DC circuit is 282 V.

What are the 4 types of power supply?

There are three major kinds of power supplies: unregulated (also called brute force), linear regulated, and switching. The fourth type of power supply circuit called the ripple-regulated, is a hybrid between the “brute force” and “switching” designs, and merits a subsection to itself.