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UCC28711: One of the power supply is turned OFF, when two modules are keeping side by side.

Rambabu k
Prodigy 10 points
Part Number: UCC28711

Dear,

In recent one application, we selected TI IC of UCC28711 pwm controller for high voltage input DC power supply. Input voltage is 1000V DC and output voltage is 110V,200W. This power supply is working well on test bench and equipment level also.

We are facing one problem when two similar power supplies are kept side by side. During this period one of the module is getting turn OFF with current sense(CS pin) instability. Both power supplies are working well when turn ON individually. 

I am not able to attach the waveforms in this email. Please share any email to me. I can share the waveforms for better study.

Thanks in advance.