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CSD95373AQ5M: Minimum time to charge bootstrap capacitor

Part Number: CSD95373AQ5M

Hello TI Team

The bootstrap capacitor is loaded every time, the Sync FET (lower switch) ist switched on, I think.

In the datasheet, there is a recommended "on time duty cycle" of 85% at fsw = 1 MHz. 
If there is a lower frequency, is the recommended duty cycle also 85% or the minimum time (100% -85%)* 1/ 1 Mhz = 150 ns?

Thank you