Body diode

Reverse recovery shoot-through current spike through Q1 occurs if during the preceding td (deadtime) interval the freewheeling current prefers to go through the body diode of Q2 instead of the paralleled Schottky... 

All the basic design equations we can write for the RMS, dc, ac, or peak currents in the input/output capacitors and the switch, when operating in conventional CCM, apply to the converter in FCCM too (though there may be some additional losses, as for example when the current flows through the body diode of the top mosfet). This, despite the fact that r can now exceed 2. In other words, the CCM equations do not get invalidated in FCCM. 

The three key areas examined were fallout after packaging and electrical testing of packaged devices, where Vsd and Rdson were the key electrical parameters evaluated. Vsd is a measure of voltage drop across a P-N junction, (source to drain) or the body diode of the device. This measurement is effected by the epitaxial layer, substrate,... 

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