LM2940 DATASHEET PDF

May 27, 2019 posted by

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 live in Lincoln. 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 dataaheet the instability trigger. If not then what am I looking for exactly. 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.

National Semiconductor

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. In second case the OKI is highly suggested. Or offer an datasheer regulator that is more linear at high frequency As suggested in this answer? 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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Is the scope trace datqsheet when under load? However, I have found that higher-frequency fluctuations in voltage are not properly regulated by the LM, causing intermittent brown-out of the MCU. Do you also have the input capacitor 0.

I just thought the OKIsr might be a little overkill datasheet terms of cost for other similar stuff down the road. Now my confusion starts with ESR and capacitor type Locate as close as possible to the regulator.

The suggested solution in that appnote, figure 7 vs. I have used the LM in a number of designs with no problem using tantalum input and output caps. I read the dataeheet sheet for the LM and understand I need two capacitors one on the input and one on the output.

LMCT-5 Datasheet

What is the input llm2940 Less crucial is a picture of the output voltage waveform especially as we don’t know what bad probing techniques you may have used. It can be 2x to 4x higher at 2 x mains frequency. 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 datashet to these policies.

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Perhaps I have misunderstood this specification? The vishay datasheet shows change of ESR with frequency. You have 5V on the schematic which can’t work.

With such low power involved you can go with the linear regulator, you shouldn’t have any problem. Home Questions Tags Users Unanswered. If the schematics is right, your input voltage is too low, the LDR needs some headroom to regulate how much depends on ln2940 actual load.

Does anyone have any ideas how I might stabilize this output? Is your automotive environment 12V or 24V? CuF is an SMD tant: I’m encountering some instabilities in datasheey regulated voltage supply. The average voltage at the input is around 6. Have you taken their compulsory advice re the output capacitor?

Sign up or log in Sign up using Google. This chip predates big cheap ceramic caps, I think.