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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Does anyone have any ideas how I might stabilize this output?

This capacitor must be rated over the same operating temperature range as lm294 regulator and. Whether this is really what they intend is unknown.

National Semiconductor – datasheet pdf

Sorry, that was my mistake. Tom Wilson 68 7. Post as a guest Name. Home Questions Tags Users Unanswered. I was lm290 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. Your oscillations are at 18 Mhz where the ESR is hopefully very low.

LM Datasheet(PDF) – National Semiconductor (TI)

Locate as close as possible to the regulator. I believe that I have conformed to the guidelines in the datasheet. 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. 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 lm29940 those MHz frequencies where you see oscillation.

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Any advice or pointers will be much appreciated! I live in Lincoln. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

National Semiconductor

Sign up or log in Sign up using Google. Perhaps I have misunderstood this specification?

By clicking “Post Your Answer”, you acknowledge that you have read our updated darasheet of serviceprivacy policy and cookie policyand that your continued use of datasneet website is subject to these policies. You quote the ESR at kHz.

JohnLincoln God Member Posts: Would something like this work? You have 5V on the schematic which can’t work. It can be 2x to 4x higher at 2 x mains frequency. Less crucial is a picture of the output voltage waveform especially as we datasjeet know what bad probing techniques you may have used. I was reading it on my break and was in a hurry. CuF is an SMD tant: Russell McMahon k 9 KevinWhite, the 5V net label represents the lowest measured output from the rectifier circuit.

Layout and circuit are crucial. Is the scope trace shown when under load? Could that contribute to the oscillation? Now my confusion lm940 with ESR and capacitor type If the schematics is right, your input voltage is too low, the LDR needs some headroom to regulate dagasheet much depends on your actual load.

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I just thought the OKIsr might be a little overkill in terms of cost for other similar stuff down the road. If you look at page 18 in its datasheet the ESR for the uF, 6. And also separately a resistor in series for belts and braces coverage: Have you taken their compulsory advice re the output capacitor?

Because they don’t list ESR on data sheets or at least the ones I’m looking at. Schematic of the regulation circuit.

The capacitor you linked to is 22pf, which is only one millionth of the specified value. As a general rule, the higher the voltage rating the larger the size so a 0.

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This capacitor must be rated over the same operating temperature range as the regulator and 2 the ESR is critical – see curve. The vishay datasheet shows change of ESR with frequency. I’m encountering some instabilities in my regulated voltage supply.

If not then what am I looking for exactly.