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What are the caps on the BS2P40 demo board? Hello, All I have is a cap between the output and ground at 22uf. Also, remember the more voltage you have lm2940ch drop and the more current you want to pull, the hotter the device will run. Sign In or Datssheet to comment. I haven’t experienced it personally, but you could have an issue there that might result in overheating.

Quick Links Categories Recent Discussions. It is essential that the output capacitor meet these requirements, or oscillations can result. I can’t find a schematic of it.

LMCT-5 Datasheet

Do you know about how much output current you have? Another data sheet darasheet 0. I believe the data sheets show a 0. I have a 22uf cap between the output and ground as specified in the datasheet for stability. Did you take steps to obtain caps with appropriate ESR?


LM2940ct 5.0 gets HOT quick.

Should I use some other voltage regulator? I will try it with the additional cap. Basic Stamp List Subject: Check your caps, it might be leaky. The acceptable range of ESR plotted versus load current is shown in the graph below. The burn your finger kind of hot. That would work alright. Furthermore, hidden pm2940ct the ap note the ones that I have seen is an admonition to have a minimum current load. Text in the Subject and Body of the message will be ignored.

Comments 10 Comments sorted by Date Added Votes. Hi John, What is the input voltage to the regulator — can you measure it?

Friday, December 05, Many of the regulators require capacitance on the input and output to minimize oscillation. Does it have a backlight? Larger values of output capacitance will give improved transient response.

Thanks, John In basicstamps yahoogroups. Otherwise the output impedance is too high and it oscillates.

The ESR of the output capacitor will cause loop instability datwsheet it is too high or too low. Typically, LCD displays take very little, but I’m not familiar with the unit you’re using. Your use of Yahoo!

It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even. Is ths just because of the load placed on datasheef due to the lcd?


The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it. If you datasyeet running very much current, and your Vin isn’t too high, a small clip-on heat sink can significantly reduce the regulator’s temperature.

The only things being powered in the circuit is the stamp and the LCD. Groups is subject to http: Thank you for all the input. There is another possibility My input is 9V, I’m using the power datasyeet that came with the P40 demo board. The LM gets hot after a few min which isn’t nice.

LMct gets HOT quick. — Parallax Forums

Photos – easier uploading and sharing. I like to put a led on the output for the minimum load, and to show, solidly, that power IS really on. 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 fatasheet get hot. Here’s a snip from p.

Another, does your LCD has backlights?