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Typically, LCD displays take very little, but I’m not familiar with the unit you’re using. Groups is subject to http: That would work alright. What are the caps on the BS2P40 demo board? It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even. There is another possibility Otherwise the output impedance is too high and it oscillates. Basic Stamp List Subject: I have a 22uf cap between the output and ground as specified in the datasheet for stability.
It is essential that the output capacitor meet these requirements, or oscillations can result. Another, does your LCD has backlights?
I believe the data sheets show a 0. Hi John, What is the input voltage to the regulator — can you measure it? The ESR of the output capacitor will cause loop instability if it is too high or too low. The power in Watts being dissipated within datasheey regulator is the voltage drop across the regulator times the current passing through it.
Your use of Yahoo! The LM gets hot after a few min which isn’t nice. Thank you for datashest the input. The acceptable range of ESR plotted versus load current is shown in the graph below.
Quick Links Categories Recent Discussions. Larger values of output capacitance will give improved transient response. Sign In or Register to comment.
LDO Voltage Regulator (5V 1A LM2940CT, drop 0.5V @0.5A)
I like to put a led on the output for the minimum load, and to show, solidly, that power IS really on. Text in the Subject and Body of the message will be ignored. 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.
Is ths just because of the load datashheet on it due datasneet the lcd? Another data sheet says 0. Did you take steps to obtain caps with appropriate ESR? Hello, All I have is a cap between the output and ground at 22uf. My input is 9V, I’m using the power supply that came with the P40 demo board. Thanks, John In basicstamps yahoogroups.
LMCT/NOPB from Texas Instruments
Check your caps, it might be leaky. I haven’t experienced it personally, but you could have an issue there that might result in overheating.
Should I use some other voltage regulator? Friday, December 05, Here’s a snip from p. Do you know about how much output current you have?
I will try it with the additional cap. The only things being powered in the circuit is the stamp and the LCD. I can’t find a schematic of it.
Many of the regulators require capacitance on the input and output to minimize oscillation. Furthermore, hidden in the ap note the ones that I have seen is an admonition to have a minimum current load. Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run. Photos – easier uploading and sharing.
Datashret 10 Comments sorted by Date Added Votes. 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.