![]() ![]() The heat was about the same as the MC34063 but just a little less as I didn’t compensate for the load reducing the voltage. Thinking that the MC34063 could be causing the issues itself, I went ahead and used an ATtiny to replicate what a little bit of SMPS would be doing – pulsing an output high and low for a specific duty cycle until I reached 5V. ![]() I began changing all the other parts – using different diodes, inductors, resistors however the P mosfet still got pretty hot even with a small heatsink. I decided to build the circuit with a NPN transistor – the TIP31 however with a small heatsink with 5V 0.37A, it rose up to 55C so I went back to a P mosfet. I decided to revist this SMPS to see if we could improve it to generate less heat, as I might have a few projects that could possibly use 5V output and 12V+ input. From our last post we looked at adding a transistor to the MC34063 and eventually changed to a P mosfet although we had to use a pretty large heatsink to dissipate all the heat. ![]()
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