Re: KA7500 vs TL494

On Wed, 09 Apr 2025 09:42:22 -0400, legg <legg@nospam.magma.ca> wrote:

On Tue, 8 Apr 2025 21:22:37 -0700, Joerg <news@analogconsultants.com>
wrote:
>

On 3/25/25 6:25 AM, legg wrote:

Chinese commodity power supplies have tended to use recognizable
configurations from times gone by. In doing so, it's easy to
miss some of the 'small stuff' that actually produced a reliable
product, in the day.
 
Even more so, when pricing reaches the 'replace vs repair' threshold
- why even bother with burn-in, in that case? If no burn-in or field
return failure analysis is ever consudered, the small errors persist,
particularly if vendors play wack-a-mole with the same hardware
offered under different brand names and paperwork.
 

>
Burn-in? Doesn't that happen at the customer? :-)

>
No, burn-in is a well-defined process control step used in the
manufacturing of equipment to achieve and maintain low failure
rates (ppm).
>

What fraction of the parts and equipment that you buy has been
burned-in? And how do you know?

I'd expect 0%, and that you don't know.