I'm designing a 100W class D amplifier, with discrete components (IRF8707 and IRS2011 gate drivers), running at about 350kHz. There's a lot of energy moving on this thing, so I'd like a good starting point. (Assume good PCB design practices have been used.)
What's the best practice for filtering the DC power input?
1. Common-mode choke between the DC input and power amp? (Between the applied voltage/gnd and the internal applied voltage/gnd)
2. Series inductor or ferrites on input? (At 24V supply, this would be several amps but possibly)
3. Combined one of the above with copious capacitor bypass of course.
The line inputs are referenced to the "true ground" - PCB ground plane, circuit ground, shield, which could be slightly isolated by the CM choke if I used it.
I'm of course going to test all this, but I wanted to get a sense of a good starting point.
What's the best practice for filtering the DC power input?
1. Common-mode choke between the DC input and power amp? (Between the applied voltage/gnd and the internal applied voltage/gnd)
2. Series inductor or ferrites on input? (At 24V supply, this would be several amps but possibly)
3. Combined one of the above with copious capacitor bypass of course.
The line inputs are referenced to the "true ground" - PCB ground plane, circuit ground, shield, which could be slightly isolated by the CM choke if I used it.
I'm of course going to test all this, but I wanted to get a sense of a good starting point.