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Old 29th July 2008, 12:20 AM   #1
ja2dhc is offline ja2dhc  Japan
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Default Any suggestion for IRS2092

Hello from Japan. This is my first post here, Class-D topics.

I am planning to build 100W Class-D using IRS2092 where I need suggestions for the following.

Which MOSFET is better between IRFB4019 and IPP50CN10N?

I want to apply deeper NFB than the referenced design.
Amp gain in the Ref.Design = 23dB
I want 15dB of Amp gain. Therefore NFB value must be 8dB
deeper than the Ref.design. Is there any suggestion on this ?
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Old 2nd August 2008, 05:52 AM   #2
MOER is offline MOER  United States
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Default IRS2092

Use IRFB4212, 4019 depending on your rail voltages.
4212 is 100v, 4019 is 150v

For even higher current capability use Fairchild FDP42an15A0, we use this and it works very well.


Steve Mantz
Zed Audio Corp.,
CA USA
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Old 2nd August 2008, 09:38 AM   #3
ja2dhc is offline ja2dhc  Japan
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Default Re: IRS2092

Quote:
Originally posted by MOER
For even higher current capability use Fairchild FDP42an15A0, we use this and it works very well.
Hellow Steve, Thanks so much for your nice suggestion.
I will investigate the datasheet of Fairchild FDP42an15A0 to compare candidates. I will use non-regulated +/- 50V supply with 20,000uF Alminum Capacitor. As for the coil of LPF, I got a pair of 22uH, 84A rated one as shown in the attached photo.
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Old 2nd August 2008, 11:52 AM   #4
luka is offline luka  Slovenia
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For supply or amp? Switching or linear(probably linear)?
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Old 2nd August 2008, 11:53 AM   #5
Pafi is offline Pafi  Hungary
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Quote:
I got a pair of 22uH, 84A rated one
This seems to have a hipersil core. If so, then a lot of heat will be produced. You'd better using a gapped ferrite, or iron-powder core!

Quote:
Therefore NFB value must be 8dB deeper than the Ref.design.
Not neccessarily. Tighter feedback generally makes more carrier on comparator, and this decreases gain of comparator (PWM modulator).
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