Hello all, new member on this forum.
Trying to build a simple adjustable dc load. Started with a published design and beefed up the power transistor stage.
I've been working on this project for over a year now on and off. It's been though about 4 revisions, but I haven't been able to make it behave.
The most recent version uses a cmos opamp driving a common collector stage driving
the power transistor, a Powerex KS621K30 triple darlington rated at 300A. The problem is I shorted the module in the exact same way I shorted banks of smaller power mosfets. They all end up with about 6ohms in off state from E to C in both directions. Testing voltage was 24v at about 20A.
Here's the most recent as-built.
Thanks!
Trying to build a simple adjustable dc load. Started with a published design and beefed up the power transistor stage.
I've been working on this project for over a year now on and off. It's been though about 4 revisions, but I haven't been able to make it behave.
The most recent version uses a cmos opamp driving a common collector stage driving
the power transistor, a Powerex KS621K30 triple darlington rated at 300A. The problem is I shorted the module in the exact same way I shorted banks of smaller power mosfets. They all end up with about 6ohms in off state from E to C in both directions. Testing voltage was 24v at about 20A.
Here's the most recent as-built.
Thanks!
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