Tool/software:
I am trying to find the total losses of the circuitry involving the VIN pin in my application such as the switching and conductive losses of the FETs. My operating point is also below the 1A that Figure 3 plots to, so I am trying to gather what data I can to try and extrapolate any useful information, such as Rds_on.
When I look at figure 3, the curve appears quadratic, which makes sense to me since the conduction losses would go up quadratically with respect to IOUT, but Equation 1 states that the curve from Figure 3 was obtained with Power Loss = (VIN x IIN) + (VDD x IDD) – (VSW_AVG x IOUT) which is linear with respect to IOUT. Equation 1 also subtracts off the switching loss term instead of adding it, which also doesn't make sense to me. The plot in Figure 3 shows that the power loss increases with IOUT (which makes perfect sense), but Equation 1 is stating that it should decrease. I have looked at other NexFET products and they all show the same issue.
Is there a method or information that can be provided to compute the losses in the bridge circuit (like Rds_on, rise/fall time, gate charge, on/off delay time, etc.)? And can the discrepancy between Figure 3 and Equation 1 be clarified?
