LTC3633A output coupling switching noise

Hi all,

Our customer will be going to select power IC, mult ch output.
They will be concerned the output coupling, and switching noise.

In the datasheet LTC3633A, page 12 "OPERATION" say following.
"One potential disadvantage to this configuration occurs when one channel is operating at 50% duty cycle.
In this situation, switching noise can potentially couple from one channel to the other, resulting in frequency jitter on one or both channels.
This effect can be mitigated with a well designed board layout."

Why occur to couple at 50% duty cycle ?
, and the condition is 50% duty cycle only ?

Best regards,
sss

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