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Re: LF: Re: And again!

from [N1BUG] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Re: And again!
From: N1BUG <[email protected]>
Date: Tue, 18 Sep 2018 09:28:09 -0400
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On 09/18/2018 07:10 AM, Chris Wilson wrote:
> With devices like this, (linked to below), limited to a max of 36V how
> do you apply the technology to say a Class D FET ended RF amp running
> on 60v or even rectified 240V mains? And secondly, with the amp
> powered, when a signal is applied, let's say the digital amateur mode,
> WSPR commences, there is a high current for a short time. How do you
> allow for this yet provide effective over current protection for
> rapidly failing devices like FET's? Thanks
> 
> http://www.ti.com/product/INA300

I'm afraid I can't help with that one. I spent some time trying to
figure out how to implement SWR and over current protection but
didn't come up with anything. I'll just have to use the FETs as
sacrificial devices.

I am a bit puzzled by the current spike on start of transmission.
What would cause that?

Paul
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