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Hi John, What is the input voltage to the regulator — can you measure it? Here’s a snip from p. Quick Links Categories Recent Discussions. Larger values of output capacitance will give improved transient response. Thanks, John In basicstamps yahoogroups.

Do you know about how much output current you have? Sign In or Register to comment. Thank you for all the input.

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

Basic Stamp List Subject: The ESR of the output capacitor will cause loop instability if it is too high or too low. Does it have a backlight? It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even. Friday, December 05, If you aren’t running very much current, and your Vin datashfet too high, a small clip-on heat sink can significantly reduce the regulator’s temperature.


Many of the regulators require capacitance on the input and output to minimize oscillation. I will try it with the additional cap. Lm2940cr, hidden in the ap note the ones that I have seen is an admonition to have a minimum current load.

Otherwise the output impedance is too high and it oscillates. The LM gets hot after a few min which isn’t nice.

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

Another, does your LCD has backlights? Should I use some other voltage regulator? It is essential that the output capacitor meet these lm2940dt, or oscillations can result.

The only things being powered in the circuit is the stamp and the LCD. Did you take steps to obtain caps with appropriate ESR? Is ths just because of the load placed on dataaheet due to the lcd?

LM2940ct 5.0 gets HOT quick.

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I haven’t experienced it personally, but you could have an issue there that might result in overheating. What are the caps on the BS2P40 demo board?

LMct gets HOT quick. — Parallax Forums

Groups is subject to http: Another data sheet says 0. The acceptable range of ESR plotted versus load current is shown in the graph below.

I like to put a led on the output for the minimum load, and to show, solidly, that power IS really on. The burn your finger kind of hot.

My input is 9V, I’m using the power supply that came with the P40 demo board.