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LM5149-Q1: LM5149 deadtime spec

Part Number: LM5149-Q1
Other Parts Discussed in Thread: LM5149

Hi team,

Could you please help share how the LM5149 20ns typ dead time is defined? Take LO off to HO on deadtime as example, is it counted from LO decreasing moment, or from LO dropping below the 2V threshold voltage?

Also customer would like to know if the deadtime is adjustable. 

They need to understand this to consider the  deadtime headroom with different gate resistor and gate cap. 

Thank you