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Re: guard ring?

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On 10/14/2018 11:44 AM, John Larkin wrote:
> On Sat, 13 Oct 2018 22:45:41 -0700, Robert Baer
> <robertbaer@localnet.com> wrote:
> 
>> John Larkin wrote:
>>>
>>>
>>> I'm still iterating on my high-voltage pulse generator. Rev C looks
>>> very good. I've been pushing it up voltage and frequency (like, 1200
>>> volts and 4 MHz) and seeing what parts fry, and working on them.
>>>
>>> I have a dpak schottky diode in a sort of snubber place. According to
>>> Spice, it shouldn't get too hot, and it's soldered to all sorts of
>>> copper pours and thermal vias and stuff. It's an SBRD10200 and it's
>>> frying. I happened to have some smaller, lower current diodes around,
>>> UPS5100E3, which is a sawed-off sub-dpak thing. I figured I might
>>> squeeze in two of those in parallel... but just one runs cool.
>>>
>>> https://www.dropbox.com/s/6zv36c4d6v7dsbn/Two_Diodes.JPG?raw=1
>>>
>>> Weird. I'm guessing that the big one has a p-n guard ring that makes
>>> it have reverse recovery current right after a big forward current
>>> spike. Data sheets never talk about that.
>>>
>>> I heat sinked things too well, so it's a bear to desolder/resolder.
>>>
>>> https://www.dropbox.com/s/bg0399wzzi4k3ze/T850C_D1_Kluge.jpg?raw=1
>> Error (500)
>> Something went wrong. Don't worry, your files are still safe and the
>> Dropboxers have been notified. Check out our Help Center and forums for
>> help, or head back to home.
> 
> Looks fine to me. Anybody else having problems seeing my links?
> 
> Some companies don't allow their employees to see Dropbox, or to
> receive verious email attatchments.

No problem at all here. Nice photos.

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guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-12 14:01 -0700
  Re: guard ring? TTman <kraken.sankey@gmail.com> - 2018-10-12 23:06 +0100
    Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-12 15:38 -0700
      Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-12 19:26 -0500
        Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-12 21:16 -0500
          Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-13 09:11 +0000
            Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-13 04:51 -0500
              Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-13 09:58 +0000
      Re: guard ring? George Herold <gherold@teachspin.com> - 2018-10-12 18:12 -0700
    Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-13 00:02 +0000
  Re: guard ring? <698839253X6D445TD@nospam.org> - 2018-10-13 06:59 +0000
  Re: guard ring? Robert Baer <robertbaer@localnet.com> - 2018-10-13 22:45 -0700
    Re: guard ring? John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-14 09:44 -0700
      Re: guard ring? John S <Sophi.2@invalid.org> - 2018-10-14 12:45 -0500
        Re: guard ring? krw@notreal.com - 2018-10-14 14:28 -0400
      Re: guard ring? Jasen Betts <jasen@xnet.co.nz> - 2018-10-14 19:28 +0000
        Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-14 20:57 +0000
          Re: guard ring? Jasen Betts <jasen@xnet.co.nz> - 2018-10-15 05:20 +0000
            Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-15 10:59 +0000
      Re: guard ring? "nuny@bid.nes" <alien8752@gmail.com> - 2018-10-14 17:39 -0700
  Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-14 14:56 -0700
    Re: guard ring? <698839253X6D445TD@nospam.org> - 2018-10-15 07:23 +0000
    Re: guard ring? <698839253X6D445TD@nospam.org> - 2018-10-15 07:54 +0000
      Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-15 11:21 +0000
        Re: guard ring? John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-15 07:52 -0700
  Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-16 10:31 -0700
    Re: guard ring? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-16 14:23 -0400
    Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-16 17:09 -0500
      Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-16 16:02 -0700
        Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-17 03:57 -0500
          Re: guard ring? John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-17 04:52 -0700
      Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-17 11:00 -0700
        Re: guard ring? Steve Wilson <9fe142ac@gmail.com> - 2018-10-17 12:13 -0700
        Re: guard ring? Steve Wilson <9fe142ac@gmail.com> - 2018-10-17 12:19 -0700
          Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-17 12:39 -0700
        Re: guard ring? Jasen Betts <jasen@xnet.co.nz> - 2018-10-17 19:15 +0000
        Re: guard ring? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-17 15:33 -0400
          Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-17 12:56 -0700
            Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-17 13:15 -0700
        Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-17 16:34 -0500

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