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 ?
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 ?
Re: IRS2092
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.
MOER said: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.
Attachments
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!
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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