I am using a LM2575T (DC/DC Buck Converter | DC/DC Converter | Overview | Step-Down Buck | TI.com) to go from a 12V DC wall adapter into a 16x2 LCD (http://www.newhavendisplay.com/specs/NHD-0216SZ-FSW-FBW.pdf), Mega, and ethernet shield.
I was originally using a 500mA DC-DC converter, since I only need to draw ~200mA between the screen, Mega, and ethernet shield, but about 10 seconds after plugging it in, the arduino power starting blinking and then shut off. This is when I switched to the LM2575T.
I have no unplugged the Mega and ethernet shield, so the DC-DC is going from 12V wall adapter into the LCD only. The LCD looks to draw only 32.5mA, but for some reason the DC-DC (rated at 1A) is getting super hot and then shutting off.
Any ideas on what's going on here?? I have the proper capacitors, and inductors attached.