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Does it have a backlight? The acceptable range of ESR plotted versus load current is shown in the graph below. The only things being powered in the circuit is the stamp and the LCD.

My input is 9V, I’m using the power supply that came with the P40 demo board. Do you know about how much datasheeh current you have? It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even. Check your caps, it might be leaky. Photos – easier uploading and sharing. There is another possibility I believe the data sheets show a 0.

LDO Voltage Regulator (5V 1A LMCT, drop V @A) in Canada Robotix

Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run. Text in the Subject and Lm2940c of the message will be ignored.


I like to put a led on the output for the minimum load, and to show, solidly, that power IS really on.

The LM gets hot datssheet a few min which isn’t nice. Friday, December 05, Hi John, What is the input voltage to the regulator — can you measure it?

The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it.

Did you take steps to obtain caps with appropriate ESR? 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. Hello, All I have is a cap between the output and ground at 22uf. Larger values of output capacitance will give improved transient response. Another data sheet says 0. Datashert you for all the input. Basic Stamp List Subject: Should I use some other voltage regulator?

Many of the regulators require capacitance on the input and output to minimize oscillation. I will try it with the additional cap.

LM2940ct 5.0 gets HOT quick.

I can’t find a schematic of it. Quick Links Categories Recent Discussions.

Is ths just because of the load placed on it due to the lcd? Sign In or Register to comment. Another, does your Dataeheet has backlights? 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.


I haven’t experienced it dataaheet, but you could have an issue there that might result in overheating. What are the caps on the BS2P40 demo board? Typically, LCD displays take very little, but I’m not familiar with the unit you’re using. Comments 10 Comments sorted by Date Added Votes. Groups is subject to http: The burn your finger kind of hot.

I have a 22uf cap between the output and ground as specified in the datasheet for stability. That would work alright. Your use of Yahoo! Furthermore, hidden in the ap note the ones that I have seen is an admonition to have a minimum current load.

Thanks, John In basicstamps yahoogroups. Here’s a snip from p. It is essential that the output capacitor meet these requirements, or oscillations can result. Otherwise the output impedance is too high and it oscillates. The ESR of the output capacitor will cause loop instability if it is too datashete or too low.