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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: The other power transistor aiming to dominate the age of SiC
Date: Fri, 06 Sep 2024 12:15:28 -0700
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On Fri, 6 Sep 2024 13:36:24 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>On 2024-09-06 13:28, john larkin wrote:
>> On Fri, 6 Sep 2024 15:08:33 -0000 (UTC), Phil Hobbs
>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>> 
>>> john larkin <jlarkin_highland_tech> wrote:
>>>> On Fri, 06 Sep 2024 10:13:44 GMT, Jan Panteltje <alien@comet.invalid>
>>>> wrote:
>>>>
>>>>> The Other Power Transistor Aiming to Dominate the Age of SiC
>>>>> https://www.electronicdesign.com/technologies/power/article/55138019/qorvo-optimizing-high-density-power-with-sic-devices-and-advanced-circuit-design
>>>>> Explore the integration of silicon-carbide (SiC) technology and advanced
>>>>> circuit design to enhance the overall density and efficiency of power converters.
>>>>> See also:
>>>>> https://www.qorvo.com/products/power-solutions/sic-fets
>>>>>
>>>>
>>>> I used a Cree SiC fet, in my Pockels Cell driver. As a high-voltage
>>>> switch, the figure of merit    Rdson * Cout   was many times better
>>>> than I could get with any silicon mosfets. The circuit wouldn't have
>>>> worked with silicon.
>>>>
>>>> But driving the gate was a real nuisance. I went from -5 to +18 in a
>>>> couple of nanoseconds, which took a special GaN driver circuit on its
>>>> own baby board,
>>>>
>>>> https://www.dropbox.com/scl/fi/y3r0qyo0hkubpc9td02y1/T852C_globbed.JPG?rlkey=gbkhx5zwaisr7e84acf5kuv80&raw=1
>>>>
>>>> The glob-top is mostly to protect the absurdly fragile EPC GaN fets,
>>>> and give them a bit of extra cooling. Finding the right glob stuff was
>>>> a project of its own.
>>>>
>>>> There are beginning to be some specific SiC gate drivers, but the
>>>> market seems to be power conversion, so the drivers are fairly slow
>>>> and have gigantic prop delays.
>>>>
>>>> I note that EPC said that they would never sell packaged parts, but
>>>> now they do.
>>>>
>>>>
>>>
>>> I used to have an AD databook with an index. The entry for “digital” was
>>> “You must be joking.”
>>>
>>> Cheers
>>>
>>> Phil Hobbs
>> 
>> Rumor has it that Intel is about to introduce a new line of opamps.
>> 
>
>Those poor guys are lucky to get anything to work these days.  Boeing, 
>Intel, Volkswagen, who's next?
>
>Financialization and ESG towards a better world, excelsior!
>
>(Not so much.)
>
>Cheers
>
>Phil Hobbs

Intel just got billions of bucks from the Feds to stay competitive in
semiconductors. They have spent about $100 billion so far on stock
buybacks.