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UCC25630-1EVM-291: System entering into the ZCS region without being overloaded..

Part Number: UCC25630-1EVM-291

Hi,

Our requirement is listed below:

Nominal Input Voltage: 700 V

Output Voltage: 30 V

Output Current: 20 A

Output Power: 600 W

- To bring out the above requirement we are using UCC25630-1EVM-291 as our reference,

- During testing we are observing the below comment:

1) We are only able to load our board till 320W (30 V, 10 A), after this (320W loading) we are observing that the system is entering into the ZCS region. The system doesn't recover even when we reduce the load, the system only starts up after we recycle the loading, 

So, could you let us know what the reason for the system may be entering into the ZCS region? and also, please let us know how the IC is selecting/sensing suitable resonant frequency.

Regards

Sreeni N K