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about the charge boot capacitor time and duty

tonyqian926
Associate II

hi,

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

the picture is below,

截屏2024-04-02 12.52.36.jpg

 

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?

截屏2024-04-02 12.54.56.jpg

 

 

 

 

1 REPLY 1
GMA
ST Employee

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.

If you agree with the answer, please accept it by clicking on 'Accept as solution'.
Best regards.
GMA