Jim Lesurf wrote:

Eeyore wrote:
Jim Lesurf wrote:

Not sure what 'secrets' remain. Even by about 1980 I had no problem
designing a 200+ Wpc amp that used no IV SOA limiting for protection.
Just needed power line fuses. Just a matter of designing for the task.
I'd always thought that IV limiters were a dubious idea. The original
405 just confirmed that for me. Given how much device technology has
moved on, I'd expect it to be a trivial to make a safe amp with no
explicit SOA protection these days if the designer knows what to do.

Might need rather more output devices than the bean counters would be
happy with though.

The trick is to show them that it ends up being cheaper than having to
repair the damn things when they keep winging back with blown devices.

Ah yes, and let's hope they can understand the concept !

ISTR a 'rule of thumb' that fixing faults gets TEN times more expensive every
step the product goes down the line, never mind reaching the customer !

Warranty repair costs can simply KILL a company.


Plus
pointing out that you save cash by not having to faff about including IV
limiting arrangements that also require components, board space, assembly,
etc. Been there. Have the tee-shirt. :-)

Mosfets are so simple like that !


And, of course, to satisfy them that the higher reliability and performance
translate into more sales.

One hopes.

Graham