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Class D Switching Power Amplifiers and Power D/A conversion

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Old 31st May 2004, 04:31 PM   #31
ZeroTHD is offline ZeroTHD  Sweden
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Thank you all for your input.
I was a little bit in a hurry when I posted the schematics- some of the resistor values are *way* off my best guesses (which probably are way off the ideal anyway ).
Jan-Peter,
Do you think It's time already to build a prototype? I'll think i have to do some more simulations first...
Bruno Putzeys,
Thank you for the hints. Although my lack of experience in the field I can already say that your solution is elegant.
IVX,
No problems with shoot-through? With the current resistor values?
And again: thanks!
.Anders
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Old 31st May 2004, 04:53 PM   #32
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Pabo,

I would do this first, (quote from Bruno):

Quote:
Simulate one single driver with a mosfet with an ohmic load to get a feel for the kind of resistor values you need. Hint: only the 10 ohm resistors are correct.
Afters this build a proto with a double layer, one layer with very BIG GROUNDPLANE....

Succes!

Regards,

Jan-Peter

www.hypex.nl
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Old 31st May 2004, 05:07 PM   #33
ZeroTHD is offline ZeroTHD  Sweden
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Quote:
Afters this build a proto with a double layer, one layer with very BIG GROUNDPLANE....
Yep, will do. We have pretty good equipment for building prototypes at work and I feel more confident laying out a PCB than I do with analog design.
I've tried Bruno's advice before, and it looks pretty good with a single MOSFET driving a single 6 Ohm resistor. The Should I alter the symmetry between the high- and low side driver to?
Regards,
Anders
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Old 31st May 2004, 07:38 PM   #34
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Hi Anders,

What do you mean with:
Quote:
Should I alter the symmetry between the high- and low side driver to?
BTW, your website doesn't work?

Regards,

Jan-Peter

www.hypex.nl
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Old 31st May 2004, 08:28 PM   #35
IVX is offline IVX  Russian Federation
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Hi Anders,
I'm was wrong about shoot-through, i'm sorry (0.1ohm as current sensor show about 1v and i forgot multiplier 10!!)
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Best regards,
E1.
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Old 1st June 2004, 01:08 AM   #36
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I can only get one leg of the driver to switch at all by driving it with a 5+ amp current source.....10 Amps gives an idea switch..?

Anything else (voltage source or less current than 5amps) gives me drive voltages which float all over and only a veeeeery low valued active pullup resistor brings gate drive to appropriate levels, but I think it's far too low as I then lose amplitude of the signal.

Can see I have some work ahead of me. Should probably start by finding a better mosfet model ...the one I'm using has almost 1n CISS, could explain why it likes ten amps drive at 500khz.

Cheers.

Chris
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