LM2940 DATASHEET PDF

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The LM/LMC positive voltage regulator features the ability to source 1A of output current with a dropout volt- age of typically V and a maximum of. The LM LMC positive voltage regulator features the ability to source 1A of output current with a dropout voltage of typically 0 5V and a maximum of 1V. The LM positive-voltage regulator features the Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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Because datasheeg don’t list ESR on data sheets or at least the ones I’m looking at. With such low power involved you can go with the linear regulator, you shouldn’t have any problem. Sign up using Facebook.

I was using the above to supply 5v to my Atmegap-pu project in my automotive environment for controlling the signal that turns on some lights via Mosfet.

As a general rule, the higher the voltage rating the larger the size so a 0. Is your automotive environment 12V or 24V? They need to be rated above my dafasheet also.

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Do you also have the input capacitor 0. It can be 2x to 4x higher at 2 x mains frequency.

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Any advice or pointers will be much appreciated! 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. Schematic of the regulation circuit. Would something like this work? The suggested solution in that appnote, figure 7 vs. If you look at page 18 in its datasheet the ESR for the uF, 6.

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Alas the data on minimum ESR is rather sketchy nothing for “C” case for exampleso you have to guesstimate from dataeheet these two graphs or get an ESR meter and measure it, or even just with your scope and a function gen that can hit those MHz frequencies where you see oscillation.

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Read 1 time previous topic – next topic. Is the scope trace shown when under load?

Hi Russel, thanks for the feedback. Thanks for your time. Whether the or Hz ESR is relevant is tbd BUT as you have a 2 x mains input ripple that the regulator is dealing with this may be the instability trigger.

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CuF is an SMD tant: Locate as close as possible to the regulator. This capacitor must be rated over the same operating temperature range as the regulator and. I have used a ground-plane in my PCB design.

The dqtasheet specifies the drop-out voltage as 0. Could that contribute to the oscillation? Post as a guest Name. Less crucial is a picture of the output voltage waveform especially as we don’t know what bad probing techniques you may have used.

LM datasheet & applicatoin notes – Datasheet Archive

This capacitor must be rated over the same operating temperature range as the regulator and 2 the ESR is critical – see lk2940. My note started from the fact that both regulator are rated at 24V input and capable of 1A, and you didn’t initially specify yours needs. As, if anything, your ESR may be too high it seems I’d try another cap in parallel. Anything with that rating or higher is fine. You quote the ESR ratasheet kHz. I just thought the OKIsr might be a little overkill in terms of cost for other similar stuff down the road.