When I use the "TPS40195EVM-001 20V to 3.3V" as design and change the MOSFETs(Q1 and Q2) to other MOSFETs and then change it back to the original values I get a warning:
IRF7821 for Q1:
Maximum qty recommended to keep from exceeding gate charge spec = 3
IRF7832 for Q2:
This MosFET's Gate Charge (34nC) exceeds the recommended value for this position. The recommended value for this position is 30nC.
I started a new design and I also get this warnings, if I use these MOSFETs.
Why are these MOSFETs used in the EVM ? Is the warning ignored for the EVM? Or is the effect on the conduction losses negligible ?
Andreas