LM2940 DATASHEET PDF

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.

Author: Shakalkree Mobei
Country: Cameroon
Language: English (Spanish)
Genre: Career
Published (Last): 21 July 2017
Pages: 468
PDF File Size: 10.34 Mb
ePub File Size: 9.64 Mb
ISBN: 807-5-52822-450-3
Downloads: 61757
Price: Free* [*Free Regsitration Required]
Uploader: Zololrajas

Schematic of the regulation circuit. Would something like this work? 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. This chip predates big cheap ceramic caps, I think. Perhaps I have misunderstood this specification?

Sign up using Facebook. Locate as datasheey as possible to the regulator. I’m encountering some instabilities in my regulated voltage supply. The vishay datasheet shows change of ESR with frequency.

Tom Wilson 68 7. Anything with that rating or higher is fine. Sign up using Email and Password.

Please see updated question with attached schematic. May be increased without bound to maintain regulation during transients. If not then what am I looking for exactly. What about with a simple resistor load at the dstasheet current, does it have the same problem?

  C# INTERVIEW QUESTIONS AND ANSWERS BY SHIVPRASAD KOIRALA PDF

Russell McMahon k 9 The average voltage at the input is around 6. JohnLincoln God Member Posts: Does anyone have any ideas how I might datqsheet this output?

NB – in the pdf you cite they say: Whether this is really what they intend is unknown. 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 dagasheet of the website is subject to these policies.

Or offer an alternative regulator that is more linear at high frequency As suggested in this answer? As, if anything, your ESR may be too high it seems I’d try another cap in parallel.

LM datasheet & applicatoin notes – Datasheet Archive

Any advice or pointers will be much appreciated! However, I have found that higher-frequency fluctuations in voltage are not properly regulated by the LM, causing intermittent brown-out of the MCU.

I believe that I have conformed to the guidelines in the datasheet. I have used the LM in a number of designs with no problem using tantalum input and output caps. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that lm940 continued use of the website is subject to these policies.

  JAIRO URIBE ESCAMILLA ANALISIS DE ESTRUCTURAS PDF

I have used a ground-plane in my PCB design. This capacitor must be rated over the dqtasheet operating temperature range as the regulator and 2 the ESR is critical – see curve.

Sorry, that was my mistake. You quote the ESR at kHz. 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. Layout and circuit are crucial. In second case the OKI is highly suggested. KevinWhite, the 5V net label represents the lowest measured output from the rectifier circuit. Post as a guest Name.

For reference, this is the Datsheet datasheet. Whether the or Hz ESR is relevant is tbd BUT as you have a 2 x datasheett input ripple that the regulator is dealing with this may be the instability trigger.

I just thought the OKIsr might be a little overkill in terms of cost for other similar stuff down the road. Also why do you have 18MHz 1. Tying down what manufacturers really mean can be a challenge.

National Semiconductor

What is the input voltage? With such low power involved you can go with the linear regulator, you shouldn’t have any problem. Is your automotive environment 12V or 24V? Thanks for your time.