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From: Joe Gwinn <joegwinn@comcast.net>
Newsgroups: sci.electronics.design
Subject: Re: Genocide Joe is beginning to stink like Lyndon B. Johnson
Date: Thu, 09 May 2024 14:38:38 -0400
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On Thu, 09 May 2024 10:24:57 -0700, john larkin <jl@650pot.com> wrote:

>On Thu, 9 May 2024 11:46:31 -0400, bitrex <user@example.net> wrote:
>
>>On 5/9/2024 11:33 AM, John Larkin wrote:
>>> On Thu, 9 May 2024 11:09:26 -0400, bitrex <user@example.net> wrote:
>>> 
>>>> On 5/9/2024 10:06 AM, John Larkin wrote:
>>>>> On Wed, 8 May 2024 23:35:28 -0400, bitrex <user@example.net> wrote:
>>>>>
>>>>>> On 5/8/2024 10:04 PM, John Larkin wrote:
>>>>>>> On Wed, 8 May 2024 19:40:49 -0400, bitrex <user@example.net> wrote:
>>>>>>>
>>>>>>>> On 5/8/2024 6:32 PM, john larkin wrote:
>>>>>>>>> On Wed, 8 May 2024 17:15:27 -0400, bitrex <user@example.net> wrote:
>>>>>>>>>
>>>>>>>>>> On 5/8/2024 10:28 AM, John Larkin wrote:
>>>>>>>>>>
>>>>>>>>>>>> Jill Biden reportedly told her husband some time ago to “Stop it, Joe,
>>>>>>>>>>>> stop it now.” Good advice that he continues to ignore — at his peril,
>>>>>>>>>>>> and ours.
>>>>>>>>>>>>
>>>>>>>>>>>> https://mondoweiss.net/2024/05/genocide-joe-is-beginning-to-stink-like-lyndon-b-johnson/
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> What's your favorite SiC mosfet?
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Why no buy WOLFSPEED:
>>>>>>>>>>
>>>>>>>>>> <https://www.mouser.com/ProductDetail/Wolfspeed/C3M0280090D?qs=nxZbHzLpdvfcUe1hs5VeOQ%3D%3D>
>>>>>>>>>
>>>>>>>>> What's wrong with that one?
>>>>>>>>>
>>>>>>>>> I've used C2M0280120D and it works fine. Gate drive is a nuisance, but
>>>>>>>>> that's true for all pure SiC parts.
>>>>>>>>>
>>>>>>>>
>>>>>>>> Ope, I meant to write "why not buy...", it looked like a nice part. More
>>>>>>>> standoff voltage than I'm accustomed to requiring for most projects,
>>>>>>>> though.
>>>>>>>>
>>>>>>>> I may have a need to roll my own hysteric synchronous buck soon, at an
>>>>>>>> astounding 12V..
>>>>>>>>
>>>>>>>
>>>>>>> That's not SiC territory. Possibly GaN if you want a tiny MHz
>>>>>>> switcher.
>>>>>>>
>>>>>>> SiC has amazingly low capacitances compared to high-voltage silicon.
>>>>>>> But the gates have to swing to levels like +15 and -5. Fast.
>>>>>>>
>>>>>>> Why design a switcher, unless it's for fun. You can get a whole 2-amp
>>>>>>> buck switcher, great internal reference, current and thermal limited,
>>>>>>> spread spectrum, for 19 cents.
>>>>>>
>>>>>>
>>>>>> Indeed there's lots of stuff off the shelf but for the application I
>>>>>> have in mind the it's is acting more like a low frequency
>>>>>> self-oscillating Class D, tracking a control voltage.
>>>>>
>>>>> I have two current designs where I muck the feedback node of a
>>>>> spread-spectrum switcher chip to use it as either a programmable power
>>>>> supply, or an amplifier.
>>>>>
>>>>> The simple one powers about 130 12-volt relays. We run them at 12
>>>>> volts whenever we reprogram them, and after a few milliseconds drop
>>>>> down to 8 volts to save power.
>>>>>
>>>>>>
>>>>>>> Eventually some damned IC jock intgrates our fun circuits.
>>>>>>
>>>>>> It's the future now, we can design our own mixed-signal ICs at the local
>>>>>> Starbucks, the IC jocks don't have to have all the fun.
>>>>>>
>>>>>> <https://www.renesas.com/us/en/document/dst/slg46140-datasheet>
>>>>>>
>>>>>> And I can integrate some other functions, too. Look at all the fun parts
>>>>>> you get for 40 cents in small quantity. These things have been solid
>>>>>> money-makers for me so far
>>>>>>
>>>>>
>>>>> People keep re-inventing the "analog FPGA" but none seem to AFbeen
>>>>> successful. There must be some deep fundamental reason why.
>>>>
>>>> Inertia? Have to use your brain?
>>>>
>>>>> OTP on a leadless package isn't appealing.
>>>>>
>>>>> A fierce uP with flash memory and some ADC and DAC channels is more
>>>>> useful.
>>>>
>>>> There aren't a lot of fierce uPs at the price, not ones with
>>>> well-documented tookits and APIs in English, anyway.
>>>>
>>> 
>>> RP2040.
>>
>>Actually I probably don't need anything as complicated as an integrated 
>>buck converter controller, anyway. Hard to believe this topology is 
>>patented but I guess so long as I don't use something similar for 
>>"digital audio"??
>>
>><https://patentimages.storage.googleapis.com/95/9c/87/a0741208b77066/US20070210861A1.pdf>
>>
>>
>>
>>
>
>That's crazy. It's obvious, trivial, and ancient.
>
>But the US Patent Office is a revenue center now. 

It was patented in 2008 as US 7456,685, which expires in 2026.  Maybe
not obvious back in 2006.

Joe Gwinn