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

Should I use some other voltage regulator? I have a 22uf cap between the output and ground as specified in the datasheet for stability. Thank you for all the input. Comments 10 Comments sorted by Date Added Votes. The LM gets hot after a few min which isn’t nice. Friday, December 05, Otherwise the output impedance is too high and it oscillates.

I will try it with the additional cap. Check your caps, it might be leaky. The burn your ,m2940ct kind of hot. 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.

Texas Instruments/TI LMCT – PDF Datasheet – Low Dropout Regulators(LDO) In Stock |

Your use of Yahoo! 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 regulator get hot. Basic Stamp List Subject: Many of the regulators require capacitance on the input and output to minimize oscillation.


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LM2940ct 5.0 gets HOT quick.

Here’s a snip from p. That would work alright.

Text in the Subject and Body of the message will be ignored. Did you take steps to obtain caps with appropriate ESR? I haven’t experienced it lm2940vt, but you could have an issue there that might result in overheating.

The acceptable range of ESR plotted versus load current is shown in the graph below. My input is 9V, I’m using the power supply that came with the P40 demo board. The only things being powered in the circuit is the stamp and the LCD.

Does it have a backlight? The ESR of the output capacitor will cause loop instability if it datxsheet too high or too low.

Typically, LCD displays take very dstasheet, but I’m not familiar with the unit you’re using. Do you know about how much output current you have? There is another possibility Larger values of output capacitance will give improved transient response. Is ths just because of the load placed on it due to the lcd? Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run.


Another, does your LCD has backlights? I believe the data sheets show a 0. Quick Links Categories Recent Discussions. Sign In or Register to comment.

Hello, All I have is a cap between the output and ground at 22uf. Thanks, John In basicstamps yahoogroups. Another data sheet says 0. I can’t find a schematic of it.

It is essential that the output capacitor meet these requirements, or oscillations can result.

Hi John, What is the input voltage to the regulator — can you measure it? Groups is subject to http: The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it.

What are the caps on the BS2P40 demo lm2940cr

It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even.