| Electronics > Projects, Designs, and Technical Stuff |
| N-MOSFET High Side Driver Circuit |
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| adrianodiaz:
Hello, I'm designing a dc-dc buck-boost converter to closed loop control and I need a push-pull driver circuit to do this. Can anyone help me? |
| boB:
First I think it would be good to build up a half-bridge synchronous buck converter with no closed loop... Say, with 50% duty cycle to start with. Synchronous buck because when the lower FET turns on, (or IGBT or...) it can pump the high-side driver capacitor to make the high side easy. This circuit will be bi-directional. Buck in one direction and boost in the other direction with double voltage on one side and half of that voltage on the other side. Choose one of many half bridge driver chips available. They will usually have a decent applications note. Don't forget to start with a current limited power supply at first to help keep the smoke in ! Also, best to use a driver that has built in dead time generation so one FET has time to turn off before the other FET turns ON and vise-versa. How much power and voltage are you looking at doing ? |
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