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

Larger values datsheet output capacitance will give improved transient response. Otherwise the output impedance is too high and it oscillates. Quick Links Categories Recent Discussions. I can’t find a schematic of it.

Basic Stamp List Subject: 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.

Another data sheet says 0. Here’s a snip from p. I will try it with the additional cap.

Check your caps, it might be leaky. The power in Watts being dissipated within the regulator is the voltage drop across the dattasheet times the current passing through it. The acceptable range of ESR plotted versus load current is shown in the graph below. Comments 10 Comments sorted by Date Added Votes. Many of the regulators require capacitance on the input and output to minimize oscillation.


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

Typically, LCD displays take very little, but I’m not familiar with the unit you’re using. Thank you for all the input. Do you know about how much output current you have? Another, does your LCD has backlights? Hi John, L,2940ct is the input voltage to the regulator — can you measure it?

LM2940ct 5.0 gets HOT quick.

Your use of Yahoo! Is ths just because of the load placed on it due to the lcd? The LM gets hot after a few min which isn’t nice. I believe the data sheets show a 0. Does it have a backlight? It is essential that the output capacitor meet these requirements, or oscillations can result.

What are the caps on the BS2P40 demo board? Friday, December 05, That would work alright. I have a 22uf cap between the output and ground as specified in the datasheet for stability.

My input is 9V, I’m using the power supply that came with the P40 demo board. Should I use some other voltage regulator? I haven’t experienced it personally, but you could have an issue there that might result in overheating. There is another possibility It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even.


Furthermore, hidden in the ap note the ones that I have seen is an admonition to have a minimum current load. Groups is subject to http: I like to put a led on the output for the minimum load, and to show, solidly, that power IS really on. The ESR of the output capacitor will cause loop instability if it is too high or too low.

Text in the Subject and Body of the message will be ignored. Did you take steps to obtain caps with appropriate ESR? Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run. 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.

The only things being powered in the circuit is the stamp and the LCD. Photos – easier uploading and sharing. Sign In or Register to comment. Thanks, John In basicstamps yahoogroups. Hello, All I have is a cap between the output and ground at 22uf. The burn your finger kind of hot.