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Re: LF: Re: Class D current spikes

from [Eric NO3M] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Re: Class D current spikes
From: Eric NO3M <[email protected]>
Date: Sun, 24 Feb 2019 08:42:15 -0500
In-reply-to: <CAA8k23Qt3k4B8CNanY3F3s3NYw5EpbJmKop8iKXyMZeH_bKd1Q@mail.gmail.com>
References: <[email protected]> <[email protected]> <[email protected]> <CAA8k23Qt3k4B8CNanY3F3s3NYw5EpbJmKop8iKXyMZeH_bKd1Q@mail.gmail.com>
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The driver and FET gates in mine are AC coupled (0.22u, SB560 schottky shunt, 10 ohm series, 4.7k shunt) and the problem still exists.  Apparently same thing Paul N1BUG was having problems with.  The spike on the end of the RF envelope is what seems most ominous and results in my 48v switcher going into fault mode.


On 2/24/19 8:29 AM, Andy Talbot wrote:
Why not AC couple your gates.  That removes all possibility of latching
100nF in series, reverse biassed diode to ground shunted by 10k or so for DC restoration
Or transformer couple




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