Lm317 Pinout

November 17, 2024 Post a Comment

Lm317 pinout

The LM317 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. It requires only two external resistors to set the output voltage. The device features a typical line regulation of 0.01% and typical load regulation of 0.1%.

How do you use a LM317 voltage 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)

How do you calculate the output voltage of an LM317 regulator?

Let us see how to use the LM317 calculator to calculate the output voltage. Let R1 = 240 Ω and R2 = 1200 Ω . Enter the values of R1 = 240 Ω and R2 = 1200 Ω . The LM317 output voltage calculator will display the output voltage V = 7.5 V .

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.

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.

Why do we need LM317?

It is capable of providing an excess current of 1.5A, hence it is conceptually considered as an operational amplifier with an output voltage ranging from 1.2V to 37V. The LM317 voltage regulator circuit internally consists of thermal overload protection and short circuit current limiting constant with temperature.

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.

How do you use LM317 for making a variable power supply circuit?

Adjustable Voltage DC Power Supply Using LM317 Voltage Regulator

Step 1: Components Required:
Step 2: LM317 Voltage Regulator. ...
Step 3: LM317 DC Power Supply Circuit: ...
Step 4: Testing the Circuit on Breadboard. ...
Step 5: PCB for LM317 Power Supply Circuit. ...
Step 6: Order the PCB.

Does LM317 need heatsink?

LM317 needs a heatsink for anything above 0.5W.

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.

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.

How efficient is LM317?

Sadly, the LM317 is not very energy efficient. It makes for a very simple solution for linear current or voltage regulators, but it is actually very wasteful in terms of power efficiency.

How can LM317 be used as a constant current source?

The LM317 regulates by adjusting it's output until it is 1.25 V higher than the voltage on the adjust pin. For a constant current supply we just need to add in a series resistor to drop 1.25 V at the required current.

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 increase the output current 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.

How do you reduce a 9V to 5V with a resistor?

Now, you want a 5V output so we'll have that for Vout and Vin is 9V. We'll just pick a random resistor value for R2 because of the ratio (but we'll have it in the KΩ range)so for R1 you'll need a 19KΩ and for R2 you'll need a 20KΩ resistor. This will give you 4.6V which is very close.

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.

What is LM317 LM337?

The LM137 and LM337-N are adjustable 3-terminal. 1• 1.5-A Output Current. negative voltage regulators capable of supplying. • Line Regulation 0.01%/V (Typical) −1.5 A or more currents over an output voltage range.

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.