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LMR33620: about minimum on-time limit

Part Number: LMR33620

Hi Sir,

may we know about minimum on-time limit? 

we condition as below:


Vout-3.3/1.5A , we choice is the B version(1.4Mhz) and DDA package.

but we calculated duty cycle is 0.11%, if use swutch frequency is 1.2Mhz~1.6Mhz , that the calculared minimum on-time is 91.6n/s~68.75n/s, if refer to the maximum value as below chart, have any risk?