I've seen a lot of buck converters where the mosfet is at the +ve rail.
Would this work?
The main attraction with this is, the microcontroller can directly drive the mosfet, and I can use a n channel mosfet rather than p channel mosfet.
Most n channel mosfets has (much) lower resistances. To put this at the top would need a mosfet driver with bootstrap as it would otherwise not turn on.
I can even use an ordinary LM358 to measure currents on the low side. Measuring currents on the high side is a pain. Just about everyone resort to dedicated high side current sense op amps.
attached the netlist (from KiCad) in case anyone feel like running this in spice. and the whole kicad project. the pcb is empty.
Would this work?
The main attraction with this is, the microcontroller can directly drive the mosfet, and I can use a n channel mosfet rather than p channel mosfet.
Most n channel mosfets has (much) lower resistances. To put this at the top would need a mosfet driver with bootstrap as it would otherwise not turn on.
I can even use an ordinary LM358 to measure currents on the low side. Measuring currents on the high side is a pain. Just about everyone resort to dedicated high side current sense op amps.
attached the netlist (from KiCad) in case anyone feel like running this in spice. and the whole kicad project. the pcb is empty.
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