Hi,

I had a crashed HDD last year. (Now I use RAID cause I am too lazy too backup '// Actually my projects never gets finished )

I found the PCB layout but seemed to have lost the schematic. Since SG3525 has complementary outputs with dead time. You need to couple (OR) both the outputs and drive the MOS.

The current sense input works on a pulse by pulse limiting followed by a soft start for persistent overload.