Hi,
I am considering using a UCC28070 device.
Among them, I would like to ask about the content when this device is externally synchronized.
I am now calculating the contents of Equations 9 and 10.
FPWM is 100kHz. Therefore, FSYNC is 200kHz.
Since TSYNC is 2.5us, DSYNC is 0.5 from Equation 9.
Since we intend to set DMAX to 0.95, RDMX is 30kΩ from Equation 10. Please see attached Excel.
Here I have one question.
I believe that setting RDMX to 30kΩ will not result in DMAX of 0.95.
Because, considering the calculation of Equation 4, if RDMX is 30kΩ, DMAX becomes 0.7.
I think that the maximum duty is limited to 70% when RDMX is set to 30kΩ by inputting the external synchronization signal under the above conditions.
is it right?
Best regards,