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LM5050-1: low VGS

Part Number: LM5050-1

Tool/software:

Hi,team,

My customer is using LM5050 in 54V PSU,but they test VGS is only 5V when output load current is 50A,they hope VGS can be larger than 6V,can you please comment why VGS is so low as I found VGS can be 12V in datasheet?

below is schmatic:7 * MOS (RDSON is 2.2mohm)

I change the R319 to 2Mohm, R320 is 0ohm,can only Increase VGS from 3V to 5V

waveform:CH1 vin; ch2 vout ; ch3 MOS VGS; CH4 vs-vin