LM3940 PDF

Texas Instruments LM Series LDO Voltage Regulators are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas. LM are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for LM DESCRIPTION. The LM is a 1A low dropout regulator designed to provide V from a 5V supply. The LM is ideally suited for systems which contain.

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Using cheap mobile phone to send an alarm Started by Western Yesterday at Started by sr Yesterday at 5: I am posting them so you will know where the information came from. I’m guessing my is not an LDO as that works fine with no load or caps. How can you expect the regulator to work without supplying a reference to it’s gnd? That’s probably it then. I’ve tried one from a box of them just to be sure I hadn’t shorted the old one out. I’m new at it so I’m gonna make mistakes Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets.

You must log in or register to reply here. Started by Silverboy Yesterday at 7: The capacitors are generally needed to stabilize the regulator and prevent it from oscillating. Post as a guest Name.

Roff Well-Known Member Apr 9, I got a bunch of LM to convert 5V to 3. Thread starter radiodude Start date Apr 8, As the comments suggest, you can’t produce a negative voltage from a simple linear regulator like that, unless you supply them with a negative voltage to begin with.

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I guess a little extra height won’t hurt.

Sign up using Email and Password. I’m giving it exactly 5 volts directly from a DC Power Supply and the output voltage should be 3.

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Media New media New comments Search media. Eventually both aspects will be there, lm940 I’m soldering piece by piece and just verifying voltages. I thought they were optional i. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. One other question, lm39940 I have to use the values on the datasheet? Home Questions Tags Users Unanswered.

This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Click here to register now. Vout seems to be Vin – Lk3940 but X changes based on Vin.

The problem is it seems 33uF is too big for an capacitor And does it have a load on it? The LM do l3940, as they are linear regulators. They just require two capacitors to make a fairly regulated output voltage opposite polarity of their input voltage. MathieuL How would you make an opamp output negative voltage without supplying one first?

LM regulator not putting out V | Electronics Forum (Circuits, Projects and Microcontrollers)

I mean I read all of it over and over in search of what I could possibly be pm3940. Welcome to our site! By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Jul 13 ’15 at Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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voltage regulator – Negative supply from LM – Electrical Engineering Stack Exchange

EugeneSh I was basing it off of another regulator design I saw here. By continuing to use this lm390, you are consenting to our use of cookies.

You can use any value of output capacitance on the LM so long as it is 33uF or more. How to create dashed plot in Octave?

The attachments below are out of the datasheet. It will not work.

LM3940 regulator not putting out 3.3V

Use a switching regulator capable of providing a negative output. In general, you need a switch of some om3940 to produce a negative voltage through either a switched capacitive solution like above, or a switching regulator like the V series. Is this something to do with the LM? Sign up or log in Sign up using Google. LM minimum load current.