LMCT-5 Datasheet, LM 5V Low Dropout Voltage Regulator Datasheet, buy LMCT Pin 5 and 6 need to be tied together on PCB board (5) ESD rating is based on the human body model, pF discharged LMCT/NOPB .. in TI data books or data sheets is permissible only if reproduction is without alteration. Digi-Key Part Number, LMCT/NOPB-ND. Copy LMCT/NOPB- ND. Quantity Datasheets, LMN, C Datasheet. Design Resources.
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The actual values of the caps matter, too. Your use of Yahoo! How’s that for redundancy? Further reading of the spec sheet yields I can’t find a schematic of it. Hello, All I have is a cap between the output and ground at 22uf. Even linear regulators are switching devices, which generate some noise that must be filtered. I believe the data sheets show a 0.
I will try it with the additional cap. Thank you for all the input. If you aren’t running very much current, and your Vin isn’t too high, a small clip-on heat sink can significantly reduce the regulator’s temperature. Comments 10 Comments sorted by Date Added Votes.
lmct P datasheet & applicatoin notes – Datasheet Archive
Furthermore, hidden in the datashdet note the ones that I have seen is an admonition to have a minimum current load. Check your caps, it might be leaky. It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even. It’s a 3-pin TO package. Do you know about how much output current you have?
Wondering if anyone has some wisdom to share, and if they can tell me if I’m even hooking this thing up properly to begin with. Many of the regulators require capacitance on the input and output to minimize oscillation. The key phrase is: The power in Watts being dissipated within the regulator is the darasheet drop across the regulator times the current datazheet through it.
Text in the Subject and Body of the message will be ignored. If you look at the diagram on the first page you will see some asterisks next to the capacitors. Typically, LCD displays take very little, but I’m not familiar with the unit you’re datahseet.
The only things being powered in the circuit is the stamp and the LCD. Here’s a snip from p. I originally thought my caps were too high in value, then I saw that the value used was a minimum.
Voltage regulator not working as expected. Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run. Can you let us know what is printed on the third line? Basic Stamp List Subject: I have a 22uf cap between the output and ground as specified in the datasheet for stability. Another lm2940c-t5.0 sheet says 0. I haven’t experienced it personally, but you could have an issue there that might result in overheating.
I wonder if anyone knows if the capacitors have any effect beyond smoothing out ripple. Keep in mind the adapter you have may be putting out more than 9 volts, or may not have a very clean output, both of which will make the regulator get hot.
Lm29400ct-5.0 for larger version I found a datasheet here: The ESR of the output capacitor will cause loop instability if it is too high or too low.
LM2940ct 5.0 gets HOT quick.
That would work alright. Thanks, John In basicstamps yahoogroups. Photos – easier uploading and sharing. The output capacitor is required to ‘maintain stability’ which probably means to keep it from oscillating, which in turn could cause the strange output readings you are getting.
Another, does your LCD has backlights? The circuit I’m building works fine with a 5V regulated supply one you plug into the wallbut I’d like to expand the lm2940ct-50. to work off of batteries as well.
The battery is a little over 9V. I wonder if this will pose a problem. Hi John, What is the input voltage to the regulator — datasheeh you measure it? It is essential that the output capacitor meet these requirements, or oscillations can result.
Datasheet says left pin is input, but it’s labelled There is another possibility OK – I see the third line info now!