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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Another, does your LCD has backlights? The ESR of the output capacitor will cause loop instability if it is too high or too low. I will try it with the additional cap. 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.
Osgeld Faraday Member Posts: Otherwise the output impedance is too high and it oscillates. I’m pretty sure Cap value correlates to the noise frequency, so no, you can’t just “go over” the value and still have the same effect. Thanks, John In basicstamps yahoogroups.
The LM gets hot after a few min which isn’t darasheet. I use these all the time, quite handy, especially with batteries since it can take a hit with the polarity hooked up backwards I can confirm for you that Left is Vin Middle is GND Right is output ive never tried without cap’s but yes they are for smoothing, but I dont know what effect outside of that they have my little breadboard bug that i made is rock solid 4.
Comments 10 Comments sorted by Pm2940ct-5.0 Added Votes. I believe the data sheets show a 0. The acceptable range of ESR plotted versus load current is shown in the graph below.
Can you let us know what is printed on the third line? I picked up some 5V 1A voltage regulators at a shop in town. My input is 9V, I’m using the power supply that came with the P40 demo board. Does it have a backlight? Do you know about how much output current you have? Friday, December 05, 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.
Datasheet says left pin is input, but it’s labelled Thank you for all the input.
Now that I look at it again, it seems that the markings on the package don’t match lm290ct-5.0 with the datasheet. Check your caps, it might be leaky. Sign In or Register to comment. I like to put a led on the output for the minimum load, and to show, solidly, that power IS really on.
Did you take steps to obtain caps with appropriate ESR? The circuit I’m building works fine with a 5V regulated supply one you plug into the wallbut I’d like to expand the design to work off of batteries as well. If you dataeheet at the diagram on the first page you will see some asterisks next to the capacitors. Photos – easier uploading and sharing. It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even.
Should I use some other voltage regulator? The cap values are related to the frequency of the noise to be filtered. Here’s a snip from p. 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. According to the diagram Input is on the left, GND is in the middle, and the 5V output should be on the right. You probably still need the capacitor. I originally thought my caps were too high in value, then I saw that the value lm2940cg-5.0 was a minimum.
I can’t find a schematic of it. Mine is unfortunately putting out more than 5V, which defeats the purpose of having a regulator.
LMCT Datasheet(PDF) – TI store
The only things being powered in the circuit is the stamp and the LCD. Text in the Subject and Body of the message will be ignored. How’s that for redundancy?
Also, remember the more voltage you have to drop and the more current datwsheet want to pull, the hotter the device will run. I have a 22uf cap between the output and ground as specified in the datasheet for stability.
Further reading of the spec sheet yields The key phrase is: Groups is subject to http: Hi John, What is the input lm2940cr-5.0 to the regulator — can you measure it?
LM2940ct 5.0 gets HOT quick.
Furthermore, hidden in the ap note the ones that I have seen is an admonition to have a minimum current load. I went digging through my dad’s old junk box and found a 16V, uF electrolytic cap. Even linear regulators are switching devices, which generate some noise that must be filtered.
Hello, All I have is a cap between the output and ground at 22uf.