Re: Class D Amp. Design
- From: Terry Given <my_name@xxxxxxxx>
- Date: Thu, 20 Oct 2005 04:59:28 +1300
Pooh Bear wrote:
Terry Given wrote:
Pooh Bear wrote:
Ken Smith wrote:
In article <435554E6.4A307EC6@xxxxxxxxxxx>, Pooh Bear <rabbitsfriendsandrelations@xxxxxxxxxxx> wrote: [...]
Actually it shouldn't be too problematic with 200-500 kHz switching f.
The motor assembly in most speakers is a pretty effective shield.
TI have an interesting app note about this. It looks at those power calculations and EMI - worth reading.
The folks that did the last batch of EMI testing for us, said that they have never seen a Class-D amplifier pass the FCC specs without a filter.
It only works for a co-located amp speaker combination.
E.g. a radio set with internal speaker.
Read the app note.
Graham
that makes sense. regardless of how good the speaker is as a shield, the dangly wires betwix amp & spkr will spew EMI everywhere.
True, but when using phase shift ( differential ) PWM it's rather less of a problem.
Graham
why would that be so?
Cheers Terry .
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