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LMR16006: How to charge the Cboot

Part Number: LMR16006

LMR16006  is a non-sync mode,when the buck regulator works in CCM , how  to charge the Cboot cap?

-when the high-side MOS open, CBoot cap discharges,

when high-side MOS close,  the inductor L1 current began to flow through the diode D1,  and the SW is clamped to -0.7V ,   

so if the WinFET opens to charge the Cboot,  no current  flows because the SW point is clamped to -0.7V ,so how to charge the Cboot cap ,pls show me 


internal circuit