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UCD3138OL64EVM-031: Using open loop EVM board to test UCD3138PFCEVM-026 instead of its control card.

Part Number: UCD3138OL64EVM-031
Other Parts Discussed in Thread: UCD3138CC64EVM-030, , UCD3138


I am testing UCD3138PFCEVM-026 which is working as expected for single phase classic boost topology.  

Now in first case, I used UCD3138CC64EVM-030 daughter card with jumper wires to connect required signals and used same firmware(UCD3138FW-PFC).

in this case, PFC was operating properly at both no load and on load.

In second case, I have dumped same firmware in UCD3138OL64EVM-031 and connected  all required signals with same jumpers. At 230V ac input and no load, PFC is giving expected output.

But when the load is turned ON (load current 0.16Amp), UCD3138 stops operation and output voltage dropped to 320 volt (bridge rectifier operation).

Any suggestions on this to obtain normal PFC operation under load with UCD3138OL64EVM-031 ?