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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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Schematic of the regulation circuit. Please see updated question with attached schematic. As a general rule, the higher the voltage rating the larger the size so a 0. Sign up or log in Sign up using Google.

National Semiconductor

If not then what am I looking for exactly. Tom Wilson 68 7. I was reading it on my break and was in a hurry.

Does anyone have any ideas how I might stabilize this output? Sorry, that was my mistake. This capacitor must be rated over the same operating temperature range as the lm290 and 2 the ESR is critical – see curve.

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LM datasheet & applicatoin notes – Datasheet Archive

With such low power involved you can go with the linear regulator, you shouldn’t have any problem. If you look at page 18 in its datasheet the ESR for the uF, 6.

Post as a guest Name. Perhaps I have misunderstood this specification? In second case the OKI is highly suggested. I’m encountering some instabilities in my regulated voltage supply. JohnLincoln God Member Posts: The capacitor you linked to is 22pf, which is only one millionth of the specified value.

This capacitor must be rated over the same operating temperature range as the regulator and. 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.

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. Would something like this work?

Do you also have the input capacitor 0. Your oscillations are at 18 Mhz where the ESR is hopefully very low. This chip predates big cheap ceramic caps, I think.

You quote the ESR at kHz. Tying down what manufacturers really mean can be a challenge. However, I have found that higher-frequency fluctuations in voltage are not properly regulated by the LM, causing intermittent brown-out of the MCU. NB – in the pdf you cite they say: I read the data sheet for the LM and understand I need two capacitors one on the input and one on the output. The suggested solution in that appnote, figure 7 vs. 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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Also why do you have 18MHz 1. Have you taken their compulsory advice re the output capacitor?

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Is the scope trace shown when under load? Read 1 time previous topic – next topic. The average voltage at the input is around 6. Russell McMahon k 9 Locate as close as possible to the regulator.