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zox2003 26th December 2007 07:31 PM

IRF540Z-class D power
How much power should we expect from pair of IRF540Z (suffix Z) in class D ,pushed by IR2010 on +/- 45V?
Theoretically I should be able to get about 250W,practically???


oldmaelstrom2 26th December 2007 08:08 PM

load impedance?

zox2003 26th December 2007 08:09 PM

4 ohms....

alfsch 26th December 2007 08:24 PM

depends on your supply...
if 40v at full power...200w out

Eva 26th December 2007 10:04 PM

There is a layout-dependent amount of overshoot on Vds that limits the maximum practical supply voltage for reliable operation. Supply pumping may be also a concern.

If you take a close look at the Vds of the low side MOSFET while switching high currents, you may see the overshoot.

Cross-conduction, if any, is another limiting factor. The more precise the switching "sequencing", the more close you can get to the limits.

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