# LM8705 DATASHEET PDF

The LM78LXX series of three terminal positive regulators is available with several fixed output voltages making them useful in a wide range of applications. LM Datasheet, LM PDF, LM Data sheet, LM manual, LM pdf, LM, datenblatt, Electronics LM, alldatasheet, free, datasheet. LM Datasheet, LM PDF. Datasheet search engine for Electronic Components and Semiconductors. LM data sheet, alldatasheet, free, databook. Author: Shar Vitilar Country: France Language: English (Spanish) Genre: Personal Growth Published (Last): 22 March 2017 Pages: 356 PDF File Size: 15.52 Mb ePub File Size: 18.68 Mb ISBN: 914-1-92035-824-8 Downloads: 80869 Price: Free* [*Free Regsitration Required] Uploader: Sacage If there any circuit available please let me know the function of that circuit. Now that you have provided more information, a voltage regulator is not actually what you want.

I will go ahead and leave that part of the answer in here for reference though. Note, Majenko already answered with a simpler method, but since you catasheet had questions I will give you a slightly different approach to it in the hope to grow your understanding more.

The specifics of the values you choose will be related to your specific circumstance, but let me give you an example:. First lets set Vin to be a constant 10v. In order to get down to 0v you will have to set Z2 to be your pot, that way when you pot is at 0 ohms, Vout is 0v. Now you need to select the values for Z1 and select the max value of your pot. The best way to approach this is to look at your current draw from Vin in your worst case, which is when Z2 is l8705 0. You probably want to keep datasehet current in the lower mA range, so I will randomly select 5mA, to solve for Z1 you use ohms law.

Now that you know Vin, Z1, and your desired range of Vout, you need to solve for Om8705. The max Vout that you want is 5v, so lets plug that all into the voltage divider equation. Now that you have a system setup that outputs v, I will skip past the sampling of the voltage and move on to how to relate your measured voltage to the position of the pot.

If you look at the equation for the voltage divider, you will find that the output voltage is not so linear. In fact if you were to plot it, it would look like so:. You can still determine what the resistance your pot is at, it will just require a little bit of math. I will let lm8750 go ahead and do this math yourself and assume you can find the resistance of your pot.

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Datashedt you get this resistance, you can just divide it by the max resistance of your pot 2 kohm in this example. This will give you a percentage that you datashret then multiply your pots range of motion by and get the pots current location.

### LM Datasheet, PDF – Alldatasheet

First you must understand what it means to regulate a voltage. The basics principal of a regulator is to take a variable higher voltage and produce a constant lower voltage. You can use pm8705 voltage divider with one of the resistors being a potentiometer lm87005 create a lower voltage, the problem is that your voltage out will depend on both the voltage in as well as the load of the output ie, what your voltage regulator is powering.

So you must use a regulator to get a constant datasheeg out. In order to achieve the ability to adjust the output voltage with a pot, you will want to use something like the LM Their website shows an example circuit as shown here, where R2 is your pot:. In operation, the LM develops a nominal 1. The reference voltage is impressed across program resistor R1 and, datasneet the voltage is constant, a constant current I 1 then flows through the output set resistor R2, giving an output voltage of.

To do this, all quiescent operating current is datsheet to the output establishing a minimum load current requirement. If there is insufficient load on the output, the output will rise. This will allow you to regulate all of the way down to 1.

## All About IC 7805 | Voltage Regulator

Usually this is made up of two resistors in series between the 5V and the Ground connections. The center tap where they join is the new output voltage, which is at the ratio of the two resistors:. You can replace the two resistors with a potentiometer in the exact same arrangement. The wiper of the potentiometer is the center tap of datashert voltage divider, and the two resistances between the wiper and either end are the two resistors R1 and R2.

Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. Would you like to answer one of these unanswered questions instead?

### Datasheet – 5V DC Voltage Regulator Data Sheet / Specs

Home Questions Tags Users Unanswered. Potentiometer to change voltage? How can we use potentiometer to regulate voltage form o-5v?

Tom Cerul 3. Note that this does not accomplish the traditional meaning of “regulate” as the output voltage would vary with the input voltage and the load, instead of remaining stable as a “regulator” usually attempts to achieve.

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How can user edit this question with a reputation of 5? What happens is people who have enough dayasheet have to approve the edit before it becomes active. The answer depends if you want to provide only a small current a few mA or more.

## How to Connect a Voltage Regulator in a Circuit

What kind of power supply do you have? Is it’s voltage stable e. A potentiometer can indeed regulate voltage. Or, rather, it can represent the input part of the closed loop for voltage control. A voltage meter provides the daatasheet, and a human operator turning the knob or moving the slider provides the control.

What you actually want is a voltage divider. A voltage divider looks like so: Selecting Values for your System Note, Majenko already answered with a simpler method, but since you still had questions I will give you a slightly different approach to it in the hope to grow your understanding more. The specifics of the values you choose will be related to your specific circumstance, but let me give you an example: In fact if you were to plot it, it would look like so: If you use Majenko’s method, you will get a linear relationship You can still determine what the resistance your pot is at, it will just require a little bit of math.

Their website shows an example circuit as shown here, where R2 is datasheeg pot: Or more precisely the datasheet says: If there is insufficient load on the output, the output will rise This will allow you to regulate all of the way down to 1.

It would be good for you to include all of this information in your questions. The arrangement is what is known as a “Voltage Divider”. The center tap where they join is the new output voltage, which is at the ratio of the two resistors: The voltage input is 5V. The pot can be whatever you have lying around. The higher datwsheet resistance the less current will flow dtasheet it. This is the normal way of connecting a pot to an ADC on a microcontroller, for instance, when you want to be able to detect how far round the pot has been turned.

I usually use 10K linear pots. Using a resistor and a potentiometer will just mean that you reduce and offset the possible voltage range. 