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UCC28951-Q1: dead time calculation

Part Number: UCC28951-Q1
Other Parts Discussed in Thread: UCC28951

Dear All,

I have selected UCC28951 IC for my DC-DC converter requirement. I have a confusion in dead time calculation.

 

the above-mentioned equation is given in the datasheet.

RAB = 15 k

CS = 1 

Ka = 0.5

I am getting value like 82417 ns, but in datasheet is 90ns.

Please let me know where I am doing mistake. 

Thanks and Regards

Prakash.S