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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Whether the or Daatasheet 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. The vishay datasheet shows change of ESR with frequency. Locate as close as possible to the regulator. Any advice or pointers will be much appreciated! Is the scope trace shown when under load? Hi Russel, thanks for the feedback.

Home Questions Tags Users Unanswered. Anything with that rating or higher is fine. Is your automotive environment 12V or 24V?

I read dayasheet data sheet for the LM and understand I need two capacitors one on the input and one on the output. I believe that I have conformed to the guidelines in the datasheet. Less crucial is a picture of the output voltage waveform especially as we don’t know what bad probing techniques you may have used. Layout and circuit are crucial.


CuF is an SMD tant: Or offer an alternative regulator that is more linear at high frequency As suggested in this answer? Perhaps I have misunderstood this specification?

In second case the OKI is highly suggested. May be increased without bound to maintain regulation l2m940 transients. This capacitor must be rated over the same operating temperature range as the regulator and.

National Semiconductor

As a general rule, the higher the voltage rating the larger the size so a 0. Tom Wilson 68 7. Your oscillations are at 18 Mhz where the ESR is hopefully very low.

Do you also have the input capacitor 0. I hope you know that the 2 are not properly the same parts, both are 5V regulators but datazheet OKI is switching power supply, while the LM is linear one, the main difference for your use is heat dissipated. Whether this is really what they intend is unknown. Dataseet McMahon k 9 With such low power involved you can go with the linear regulator, you shouldn’t have any problem.

Thanks for your time. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Because they don’t list ESR on data sheets or at least the ones I’m looking at. Sign up or log in Sign up using Google. If the schematics is right, your input voltage is too low, the LDR needs some headroom to regulate how much depends on your actual load. Read 1 dataeheet previous topic – next topic.


LM Datasheet(PDF) – National Semiconductor (TI)

The average voltage at the input is around 6. You have 5V on the schematic dataeheet can’t work. And also separately a resistor in series for belts and braces coverage: Sorry, that was my mistake. Does anyone have any ideas how I might stabilize this output? You quote the ESR at kHz. Sign up using Facebook. I just thought the OKIsr might be a little overkill in terms of cost for other similar stuff down the road.

My note started dagasheet the fact that both regulator are rated at 24V input and capable of 1A, and you didn’t initially specify yours needs. This capacitor must be rated over the same operating temperature datasueet as the regulator and 2 the ESR is critical – see curve.

I was reading it on my break and was datashete a hurry. NB – in the pdf you cite they say: Email Required, but never shown. The datasheet specifies the drop-out voltage as 0.

This chip predates big cheap ceramic caps, I think. Would something like this work? Sign up using Email and Password. Could that contribute to the oscillation? Schematic of the regulation circuit.