Hi Kai,
The reference design linked below is for a 36V, 1kW design using the DRV8303:
www.ti.com/.../TIDA-00285
I believe the reference design you're referring to is the 24V, 100W/30W design. The MOSFETs used in this design would not be rated for 300W at 24V, but could be substituted with higher rated MOSFETs.
www.ti.com/.../TIDA-00447
The reference design linked below is for a 36V, 1kW design using the DRV8303:
www.ti.com/.../TIDA-00285
I believe the reference design you're referring to is the 24V, 100W/30W design. The MOSFETs used in this design would not be rated for 300W at 24V, but could be substituted with higher rated MOSFETs.
www.ti.com/.../TIDA-00447