LM2940 DATASHEET PDF

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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I was reading it on my break and was in a hurry. What is the input voltage?

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. Does anyone have any ideas how I might stabilize this output? However, Datashheet have found that higher-frequency fluctuations in voltage are not datashee regulated by the LM, causing intermittent brown-out of the MCU.

And also separately a resistor in series for belts and braces coverage: Schematic of the regulation circuit. The average voltage at the input is around 6. 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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I’m encountering some instabilities in my regulated voltage supply. For reference, this is the LM datasheet. Or offer an alternative regulator that is more linear at high frequency As suggested in this answer? I live in Lincoln. Any advice or pointers will be much appreciated!

LM datasheet & applicatoin notes – Datasheet Archive

Anything with that rating or higher is fine. Is your automotive environment 12V or 24V? Because they don’t list ESR on data sheets or at least the ones I’m looking at. If you look at page 18 in its datasheet the ESR for the uF, 6. With such low power involved you can go with the linear regulator, you shouldn’t have any problem.

Have you taken their compulsory advice re the output capacitor?

What about with a simple resistor load at the same current, does it have the same problem? The suggested solution in that appnote, figure 7 vs.

National Semiconductor

They need to be rated above my voltages also. Layout and circuit are crucial. JohnLincoln God Member Posts: Russell McMahon k 9 May be increased without bound to maintain regulation during transients. This chip predates big cheap ceramic caps, I think. Thanks for your time. Sorry, that was my mistake. You have 5V on the schematic which can’t work. Would something like this work? Alas the data on minimum ESR is rather sketchy nothing for “C” case for exampleso you have to guesstimate from just 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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Also why do you have 18MHz 1. Read 1 time previous topic – next topic. I read the data sheet for the LM and understand I need two capacitors one on the input and one on the output. 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.