For designing a low side non-sync buck regulator I am looking for MOSFET(s) that can provide low overall power loss. Conditions would be 60V to 48V, 10A, 600 kHz (worst case), 1 Ohm source and 0.35 Ohm sink gate driver. Schematic would be as shown below, although without a LED load.
For this I was using the Cross reference comparison tool by EPC that provides the various power loss for a MOSFET for switching conditions specified. If we take a potential MOSFET such as FDD86110, we see that the diode reverse recovery loss is much higher than other losses. This is validated by calculation of loss by
My questions would be
- If this loss is such a big part of power loss at higher voltage, why don't most manufacturers or sellers have this as a criteria to sort or filter MOSFETS? And what is a good way to find MOSFETs with low Qrr along with other filter criteria.
- Schottky diode in parallel to the MOSFET would reduce power loss? If yes, how to calculate the power loss with this?
- Is there any other way to reduce this power loss?