Thanks for the help guys. I've been going over loads of sim results over the last 5 days or so and it has helped me greatly in understanding how this circuit is working. Unfortunately, I can't share it as the person I got this design from would have more than a cow if I let it loose. Thank you for asking, though. I'm a firm believer in the more eyes, the better. Anyways, I discovered numerous things I didn't know before.
Jan, I took your advice not to believe false positives. Yes, they do pop up. But I did find some noteworthy errors and discovered the driver stage had offset gains which resulted in higher thirds. Damn depletion modes don't come in enough flavors :( And there is nothing I can do about PSU sensitivity 'cept for regulating, which is good to know, none the less. The best part about LTspice I found was the quick verifications of heat dissipation which helped me greatly. I had thought worst case heat was going to be around 63 Watts, and now I know for sure. I'll be ordering parts tomorrow, and I hope the reality is close to the expected improvements. I know it will be at least better than how it is now. PS.. I spec'd the 1000 Watt version without fear of blowing anything. The damn thing is going to idle @ 78 Watts. And I can still keep it 9 devices (I was able to drop one I found doing the sims!) if I go with these Magnatek BUZ900/905 monsters: http://www.magnatec-uk.com/pdf/magnatec/BUZ900X4.pdf -- How many boards would the Mongols hoard if the Mongol hordes got bored? -- Calvin
