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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National Semiconductor – datasheet pdf
I hope you know that the 2 are not properly the same parts, both are 5V regulators but the OKI fatasheet switching power supply, while the LM is linear one, the main difference for your use is heat dissipated.
Tom Wilson 68 7.
You quote the ESR at kHz. Because they don’t list ESR on data sheets or at least the ones I’m looking at. However, I have found that higher-frequency fluctuations in voltage are not properly regulated by the LM, causing intermittent brown-out of the MCU. Does anyone have any ideas datashee I might stabilize this output?
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. If not then what am I looking for exactly. Tying down what manufacturers really mean can be a challenge. Is your automotive environment 12V or 24V? Sorry, that was my mistake.
In second case the OKI is highly suggested. They need to be rated above my voltages also. You have 5V on the schematic which can’t work. I live in Lincoln.
LM datasheet & applicatoin notes – Datasheet Archive
With such low power involved you can go with the linear regulator, you shouldn’t have any problem. I’m encountering some instabilities in my regulated lmm2940 supply.
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 datashfet trigger. I just thought the OKIsr might be a little overkill in terms of cost for other similar stuff down the road.
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 2 the ESR is critical – see curve.
I believe that I have conformed to the guidelines in the datasheet.
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 datashdet hit those MHz frequencies where you see oscillation.
Hi Russel, thanks for the feedback. Now my confusion starts with ESR and capacitor type Email Required, but never shown. As, if anything, your ESR may be too high it seems I’d try another cap in parallel. Less crucial is a picture of the output voltage waveform especially as we don’t know what bad probing techniques you may have used. I was using the above to supply 5v to my Atmegap-pu ml2940 in my automotive environment for controlling the signal that turns on some lights via Mosfet.
Anything with that rating or higher is fine.
Sign up or datasgeet in Sign up using Google. It can be 2x to 4x higher at 2 x mains frequency. As a general rule, the higher the voltage rating the larger the size so a 0.
Post as a guest Name. May be increased without bound to maintain regulation during transients. Russell McMahon k 9