On Sun, 12 Jan 2014 18:06:08 -0700, Jim Thompson
wrote:

On Sun, 12 Jan 2014 17:03:13 -0800, John Larkin
wrote:

On Sun, 12 Jan 2014 17:10:55 -0700, Jim Thompson
wrote:

On Sun, 12 Jan 2014 14:55:09 -0800, John Larkin
wrote:

On Sun, 12 Jan 2014 14:32:06 -0700, Jim Thompson
wrote:

On Sun, 12 Jan 2014 09:58:44 -0800, John Larkin
wrote:

On Sun, 12 Jan 2014 08:35:18 -0700, Jim Thompson
wrote:

It appears the only valid data point for these power MOSFET's is the
"total gate charge", Qg. The capacitances listed are useless for
switch applications... their only value would appear to be if you were
designing an RF amplifier.

But here's the useful part...

Cgeffective = 2*Qg/Vg

This is the effective capacitance you must drive to reach your desired
Vg. (Caution, use the Qg graph, not anything in a table... Qg
increases with Vg.)

Even the schmuck-in-chief should find that useful :-}

...Jim Thompson

You said that you calculated the values in the circuit that you posted. Quit
dancing around and show us that calculation.

Patience is a virtue. Are you not virtuous ?:-}

...Jim Thompson

Competence is a virtue too. Are you competent?

I suspect you've never done it, as you claimed you had, and you're still
struggling and stalling.

It's actually been "done" since around noon, but I've been hanging
paintings and doing other honey-do tasks.

...Jim Thompson

So, on Jan 7, when you said "it was calculated", you lied. It took you almost a
week to figure it out.

I didn't lie. I didn't have it all in a compact form, it required
iteration... now it doesn't, see...


You have never shown how you arrived at the values you posted, except to claim a
calculation that you won't reveal.


--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation