Sunday, 3 November 2019

Why is the gate charge curve (Miller plateau) of MOSFETs dependent on Vds?


I don't understand why the gate charge curve (exactly: the Miller plateau part) of MOSFETs is dependent on the drain-source voltage Vds.


As an example, the datasheet of of the IRFZ44 shows on page 4 (Fig. 6) the gate charge curves for different Vds values.


Why is the Miller plateau longer for bigger Vds? Isn't the plateau dependent upon Cgd? But Cgd (= Crss) gets smaller for bigger Vds (see FIg.5 in datasheet). Shouldn't the Miller plateau get shorter?





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