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Find a DC circuit that outputs positive and negative 12V output [Copy link]

The power input is 18V, and the output needs to be 5V/5A, 12V/3A, -12V/2A. There are three output voltages. I don't know which company can do a better job of DC step-down.
I found a L7912 power IC, but it heats up a lot, mainly because the -12V voltage is not easy to handle.

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