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Do you know about how much output 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.

Another data sheet says 0.

Quick Links Categories Recent Discussions. The ESR of the output capacitor will cause loop instability if it is too high or too low. Hi John, What is the input voltage to the regulator — can you measure it? Thank you for all the input. Did you take steps to obtain caps with appropriate ESR? Another, does your LCD has backlights?

Your use of Yahoo! I will try it with the additional cap.

I believe the data sheets show a 0. Thanks, John In basicstamps yahoogroups.

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

I have a 22uf cap between the output and ground as specified in the datasheet for stability. I haven’t experienced it personally, but you catasheet have an issue there that might result in overheating. Is ths just because of the load placed on lm2940cy due to the lcd? The only things being powered in the circuit is the stamp and the LCD. Groups is subject to http: 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.


I can’t find a schematic of it. Many of the regulators require capacitance on the input and output to minimize oscillation. Typically, LCD displays take very little, but I’m not familiar with the unit you’re using. Otherwise the output impedance is too high and it oscillates. The acceptable range of ESR plotted versus load current is shown in the graph below. Furthermore, hidden in the ap note the ones that I have seen is an admonition to have a minimum current load.

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.

Does it have a backlight?

LMCT Datasheet(PDF) – National Semiconductor (TI)

Basic Stamp List Subject: Larger values of output capacitance will give improved transient response. The burn datasheeg finger kind of hot. There is another possibility Hello, All I have is a cap between the output and ground at 22uf. Text in the Subject and Body of the message will be ignored.


That would work alright. Friday, December 05, The LM gets hot after a few min which isn’t nice.

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

It is essential that the output capacitor meet these requirements, or oscillations can result. Should I use some other voltage regulator? Here’s a snip from p. Sign In or Register to comment. Photos – easier uploading and sharing. Check your caps, it might be leaky.

LM2940ct 5.0 gets HOT quick.

What are the caps on the BS2P40 demo board? The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it. Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run. Comments 10 Comments sorted by Date Added Votes.

I like to put a led on the output for the minimum load, and to show, llm2940ct, that power IS really on. My input is 9V, I’m using the power supply that came with the P40 demo board.