TIDA-01606: The reason of DESAT Use or No-use

Tool/software:

Hi,

On TIDA-01606 reference design, the driver on the 1200V-rated side has DESAT and the driver on the 650V-rated side has no DESAT. Could you tell us the reason of DESAT's use/no-use as this design concept?  Please advise us.

Thanks and best regards,
M.HATTORI