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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And also catasheet a resistor in series for belts and braces coverage: Have you taken their compulsory advice re the output capacitor? JohnLincoln God Member Posts: In second case the OKI is highly suggested. 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. Layout and circuit are crucial.

If not then what am I looking for exactly. 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.

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. I have used a ground-plane in my PCB design. NB – in the pdf you cite they say: Sign up using Email and Password.

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LM Datasheet(PDF) – National Semiconductor (TI)

Or offer an alternative regulator that is more linear at high frequency As suggested in this answer? Now my datzsheet starts with ESR and capacitor type The vishay datasheet shows change of ESR with frequency. Tom Wilson 68 darasheet. Read 1 time previous topic – next topic. 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.

The datasheet specifies the drop-out voltage as 0. What about with a simple resistor load at the same current, does it have the same problem?

Whether this is really what they intend is unknown. This chip predates big cheap ceramic caps, I think.

LM Datasheet(PDF) – List of Unclassifed Manufacturers

Sign up using Facebook. Would something like this work? Locate as close as possible to the regulator. Perhaps I have misunderstood this specification?

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I was reading it on my break and was in a hurry. 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 live in Lincoln. I read the data sheet for the LM and understand I need two capacitors one on the input and one on the output. This capacitor must be rated over the same operating temperature range as the regulator and.

Daatsheet be increased without bound to maintain regulation during transients. Could that contribute to the oscillation?

Russell McMahon k 9 If you look at page 18 in its datasheet the ESR for the uF, 6. You have 5V on the schematic which can’t work. What is the input voltage?

National Semiconductor

The capacitor you linked to is 22pf, which is only one millionth of the specified value. Hi Russel, thanks for the feedback. Do you also have the input capacitor 0. With such lm9240 power involved you can go with the linear regulator, you shouldn’t have any problem. Home Questions Tags Users Unanswered. Your oscillations are at 18 Mhz where the ESR is hopefully very low.

KevinWhite, the 5V net label represents the lowest measured output from the rectifier circuit.