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Old 30th June 2009, 08:48 AM   #1
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Default IRFP240 are they useful for class D amplifier circuit?

IRFP240 are they useful for class D amplifier circuit?

i'm planing to use them with IRS2092
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Old 30th June 2009, 11:46 AM   #2
wg_ski is offline wg_ski  United States
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Why wouldn't they be? You won't get (or wouldn't want) as fast a fall time because of the higher source inductance compared to paralleled TO-220. So you pay a penalty in efficiency and you need a longer dead time and/or lower clock frequency (adjustable). But it would *work* and still run cooler than a linear amp.
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Old 30th June 2009, 12:13 PM   #3
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wg_ski - do yo you have schematics like this?
or i can only change these fet's and use data sheet schematics
i'm new in class D in ,thanks!
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Old 30th June 2009, 01:36 PM   #4
Pafi is offline Pafi  Hungary
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I wouldn't use it, because of its sloooow body diode, with gigantic reverse recovery charge. It causes very high switching loss, RF radiation, quality degradation...
Better ones:
STW34NB20
IRFB4020
etc...
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Old 30th June 2009, 05:08 PM   #5
Eva is offline Eva  Spain
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IRFP240 are ancient MOSFET only useful for burning watts in ancient linear amplifier designs. If you have some, they should be easy to sell to people doing class AB or A.

Some of my favourite ones for class D are:

- IRF540Z for 100V (nothing to do with other IRF540 variants)
- IRFB4321 for 150V
- IRFB4227 for 200V

This selection is aimed towards low conduction losses at the expense of higher gate drive requirements, but of course there are "lighter" ones intended for easy drive:

- IRFB4212 (100V)
- IRFB4019 (150V)
- IRFB4020 (200V)

Similar MOSFET from Fairchild are worth mentioning too, since some of them may outperform the ones from IR in certain circumstances (but others are ovbiously inferior):

- FDP3632, FDP3652, FDP3682 (100V)
- FDP2532, FDP2552, FDP2572 (150V)
- FDP2614 (200V)
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Old 4th July 2009, 11:18 PM   #6
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Default Re: IRFP240 are they useful for class D amplifier circuit?

Quote:
Originally posted by jazzman06
IRFP240 are they useful for class D amplifier circuit?

i'm planing to use them with IRS2092

Use a IRFP250 instead, cheaper and higher current and wattage.
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