about the charge boot capacitor time and duty

[tonyqian926]

hi,

    I set the charge boot capacitor time with 100ms and the duty with 50%. 

the picture is below，

 

and I captured the waveform by the scope. low side (green,16V from drive circuit),high side (red, 3.3V from MCU). the low side boot time is 125us. why is not 100ms?

 

 

 

 

[GMA]

Hello @tonyqian926,

Please, have a look the following application note.
These Charge Boot Capacitor settings concern the phase on which only Low Side Switches are driven for capacitor charging before going to START phase.