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Topic: Arduino Mega2560 and Ethernet Shield regulator generate too much heat (Read 628 times) previous topic - next topic

eddy9

Hi,

So, I am using a 12V supply to power the Arduino MEGA2560 with an Ethernet shield. I noticed that the onboard regulator on the mega gets very hot to the point it cannot be touched. Is it normal for it to get this hot? Is this heat going to damage the boards? I am planning to use the mega 5V out to power some additional electronics which I think will use 100ma to 200ma in addition to what the mega and the Ethernet shield draw. I am not sure how much heat will be generated from the regulator and if this will damage the boards. I experimented with different supply voltages from 5.5V to 12 V and found that anything above 8V will generate too much heat to the point the regulator cannot be touched. But since I need 12V to power other circuits, I would like to avoid the scenario where I will need to use another source just for the Arduino and the Sheild. Any comments?

Thanks

CrossRoads

Put a heat sink on the regulator.

Or regulate the 12V source down to 7.5V before bringing it into the board.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

tyguy2

the max amount of power a mega can handle is 7-12 volts.....
maybe you should use a 9 volt. it works for me.

CrossRoads

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

eddy9

Yes, I need 12 volt for other stuff, so I would like to stick with just the 12V if possible. But powering up just the Mega and the Ethernet shield from 12V generates too much heat (the regulator and the surrounding area/parts get too hot to touch). But according to the Mega2560 specs, the voltage range can be 7-12V. I think this spec is not completely true. 12V may work powering up just the mega board but not with anything else attached to it. This should be stated somewhere as this may cause a safety hazard.

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