how to build a switch regulator

[jx_ben]

How to buld a switch regulator, instead of using IC with input of 15v to 60v dc convert to 5vol dc? I need this regulator as power supply for mirco-controller- atmega8.

 

[john blue]

Just use 7805. It can stand up to 1A. I dont think you need more than that to power up your microcontroller. If not use 5V Zener. But 7805 is still a better choice. ~~

 

[ejeet]

Here is something for you to start with. I built the design in LTSpice. To get within your specific parameters you should simulate with peak current transients on your edge input voltages.

 

[MikehZA]

Just use 7805. It can stand up to 1A. I dont think you need more than that to power up your microcontroller. If not use 5V Zener. But 7805 is still a better choice. ~~

The 7805 will not be able to witstand the 60V input

 

[ejeet]

The comparator used in the simulation was fast enough to manage on its own. I have taken out one of the two comparators.

 

[goldsmith]

Dear ejeet
Hi
Of course your circuit will not good if you don't add a totem pole stage to drive enough current of gate .
By the way , your circuit isn't switch mode , because i think this circuit can't generate PWM .
And Dear jx_ben
Hi
i think if you try an LM2576 ADj HV , it will be a good choice too .
Best Wishes
Goldsmith