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The burn your finger kind of hot. There is another possibility Comments 10 Comments sorted by Date Added Votes. Thank you for all the input. The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it.

The ESR of the output capacitor will lm2940t loop instability if it is too high or too low. The LM dqtasheet hot after a few min which isn’t nice.

LDO Voltage Regulator (5V 1A LM2940CT, drop 0.5V @0.5A)

Groups is subject to http: Here’s a snip dztasheet p. Is ths just because of the load placed on it due to the lcd? Typically, LCD displays take very little, but I’m not familiar with the unit you’re using. Does it have a backlight? Sign In or Register to comment. Friday, December 05, Should I use some other voltage regulator? Another, does your LCD has backlights?


LMCT Datasheet pdf – 1A Low Dropout Regulator – National Semiconductor

I believe the data sheets show a 0. Many of the regulators require capacitance on the input and output to minimize oscillation. 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. Otherwise the output impedance is too high and it oscillates. Also, remember the more voltage you have to drop datashewt the more current you want to pull, the hotter the device will run.

I haven’t experienced it personally, but you could have an issue there that might result in overheating. The only things being powered in the circuit is the stamp and the LCD.

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

Another data sheet says 0. Basic Stamp List Subject: 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.

Did you take steps to obtain caps with appropriate ESR? I have a 22uf cap between the output and dataheet as specified in the datasheet for stability. My input is 9V, I’m using the power supply that came with the P40 demo board. Photos – easier uploading and sharing. Do you know about how much output current you have? Larger values of output capacitance will give improved transient response.


What lm2904ct the caps on the BS2P40 demo board?

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

Check your caps, it might be leaky. That would work alright. Furthermore, hidden in the ap note the ones that I have seen is an admonition datasheey have a minimum current load. It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even.

Your use of Yahoo! Thanks, John In basicstamps yahoogroups. Text in the Subject and Body of the message will be ignored.

The acceptable range of ESR plotted versus load current is shown in the graph below. Hello, All I have datzsheet a cap between the output and ground at 22uf. It is essential that the output capacitor meet these requirements, or oscillations can result.

I can’t find a schematic of it.

I will try it with the additional cap. Hi John, What is the input voltage to the regulator — can you measure it?

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