SN6501: EMI Suppression capacitor for SN6501

Part Number:SN6501

Hello,

We are using SN6501 with 750313769 transformer for generating an isolated power from 3.3V to 5V.

Input: 3.3V with its return connected Earth/Chassis

Output: 5V with its return floating (one of the 3-Ph voltages. 400Vrms with respect to Earth potential)

For meeting EMI/EMC requirements, do we need to add a HV capacitor across the isolation transformer for common mode noise? We found these capacitor requirements in typical flyback circuits. 

In datasheet/EVM guides we have not found any EMI test results or recommendations.

We need to comply with following.

EN55011 Conducted Emission Class B.
EN55011 Radiated Emission Class B.

Please let us know if any application notes/recommendations/test results available for push pull converters which helps in meeting EMI/EMC compliance.

Thanks & Regards,

Chethan K S