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From: John Larkin <jjSNIPlarkin@highNONOlandtechnology.com>
Newsgroups: rec.sport.pro-wrestling,rec.arts.tv,uk.comp.sys.mac,edm.general,sci.electronics.design
Subject: Re: Genocide Joe is beginning to stink like Lyndon B. Johnson
Date: Thu, 09 May 2024 07:06:28 -0700
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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 have been
successful. There must be some deep fundamental reason why.

OTP on a leadless package isn't appealing.

A fierce uP with flash memory and some ADC and DAC channels is more
useful.