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tech / sci.electronics.design / What diode to use for a primary side rcd clamp?

SubjectAuthor
* What diode to use for a primary side rcd clamp?Johann Klammer
+* Re: What diode to use for a primary side rcd clamp?Phil Hobbs
|`- Re: What diode to use for a primary side rcd clamp?Johann Klammer
`- Re: What diode to use for a primary side rcd clamp?legg

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What diode to use for a primary side rcd clamp?

<tgvfp8$19a4$1@gioia.aioe.org>

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From: klamm...@NOSPAM.a1.net (Johann Klammer)
Newsgroups: sci.electronics.design
Subject: What diode to use for a primary side rcd clamp?
Date: Tue, 27 Sep 2022 20:35:09 +0200
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 by: Johann Klammer - Tue, 27 Sep 2022 18:35 UTC

Specifically the LNK616 flyback regulator.
They have 1N4007 in their dataheets/appnotes.
But the 1N4007s trrs are all over the place.
Often around 1us. The regulator has a minimum on-time of
700ns, and really does not like surge currents.
What are better specced alternatives?

Re: What diode to use for a primary side rcd clamp?

<83ef6404-d4a5-426a-5c01-34d1ce1e2032@electrooptical.net>

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From: pcdhSpam...@electrooptical.net (Phil Hobbs)
Newsgroups: sci.electronics.design
Subject: Re: What diode to use for a primary side rcd clamp?
Date: Tue, 27 Sep 2022 15:33:11 -0400
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 by: Phil Hobbs - Tue, 27 Sep 2022 19:33 UTC

Johann Klammer wrote:
> Specifically the LNK616 flyback regulator.
> They have 1N4007 in their dataheets/appnotes.
> But the 1N4007s trrs are all over the place.
> Often around 1us. The regulator has a minimum on-time of
> 700ns, and really does not like surge currents.
> What are better specced alternatives?
>

How about
<https://www.digikey.com/en/products/detail/comchip-technology/US1M-HF/12713336>
?

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

Re: What diode to use for a primary side rcd clamp?

<tgvjnf$15qq$1@gioia.aioe.org>

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From: klamm...@NOSPAM.a1.net (Johann Klammer)
Newsgroups: sci.electronics.design
Subject: Re: What diode to use for a primary side rcd clamp?
Date: Tue, 27 Sep 2022 21:42:27 +0200
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 by: Johann Klammer - Tue, 27 Sep 2022 19:42 UTC

On 09/27/2022 09:33 PM, Phil Hobbs wrote:
> Johann Klammer wrote:
>> Specifically the LNK616 flyback regulator.
>> They have 1N4007 in their dataheets/appnotes.
>> But the 1N4007s trrs are all over the place.
>> Often around 1us. The regulator has a minimum on-time of
>> 700ns, and really does not like surge currents.
>> What are better specced alternatives?
>>
>
> How about
> <https://www.digikey.com/en/products/detail/comchip-technology/US1M-HF/12713336> ?
>
> Cheers
>
> Phil Hobbs
>
thank you.. forgot to say: it's all on perfboard.
will use UF4007.

Re: What diode to use for a primary side rcd clamp?

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From: leg...@nospam.magma.ca (legg)
Newsgroups: sci.electronics.design
Subject: Re: What diode to use for a primary side rcd clamp?
Date: Tue, 27 Sep 2022 17:54:29 -0400
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 by: legg - Tue, 27 Sep 2022 21:54 UTC

On Tue, 27 Sep 2022 20:35:09 +0200, Johann Klammer
<klammerj@NOSPAM.a1.net> wrote:

>Specifically the LNK616 flyback regulator.
>They have 1N4007 in their dataheets/appnotes.
>But the 1N4007s trrs are all over the place.
>Often around 1us. The regulator has a minimum on-time of
>700ns, and really does not like surge currents.
>What are better specced alternatives?

Slower diodes are used in the clamp for a reason.
That said, I've never seen 4000 series specified there.

In4937 (from memory) often used with trrs in the >500ns
range. Don't use ultrafast parts there. Leakage energy
is intended to be applied into the load during clamping,
rather than being burnt.

RL

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