Hi NANDBlog,
Maybe its better that you try to understand wat i try to say...
Like Rigol is using the IRFP250 much closer to there Max. Vds than HP in there 6060A, more change it wil fail.
And i think HP, like a told before, uses a better savety marging and i trust the HP design team more than Rigol.
Take al look at al the big differences for the datasheet for the IRF540 from different brands, these are not the same Mosfet!
So, if you blow the power section witch part are you gonna use? ( of course the HP component for the 6060A
)
Design a DC load for yourself, no problemo, if yo want to do production for 3000 units, are you gonna use a Fairchild part? or ON semi (if these still exist)
Can i replace it with a IRF part (Vishay) or ST, wat about the internal capacitors in de Mosfet, every brand it is different. (maybe thats the source of the instability of the Rigol
)
Do i have to use more compensation so that i can use all brands IRF250, do i still reach my power bandwith...
Yes! these IRF250 Mosfets are cheap, but can also be problematic to use, effery brand tells you to read an respect the datasheet data.
There are to many electronic designers wo are not enough aware of SOA problems, or thermal problems like the linear regulators in the Rigol products.
Or are pushed by the braindead marketing department, to make stupid decisions. (Rigol buttons, text, linear regulators, wiring in my Rigol DP832A Power Supply, 470uF! over the output for a 3A Power supply, van noise, etc.)
I like to test a Rigol DC load fo a day on 160V full load at 40C room temperature, lets see what happen...
Kind regards,
Blackdog