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UCC21540: Primary side and the secondary side waveform overlap at 60C

Part Number: UCC21540

Hi Team,

We have received this inquiry from our customer,

We are using TI's UCC21540 device, but there are some questions during the application. Now I want to consult technical support and hope to get your help. 1. Figure 2 in the attachment is the test waveform of INA/B vs. GND for CH2, and the test waveform of OUTA/B for CH4.During the test, when we were at a high temperature of 60℃, the waveforms of the primary side and the secondary side could overlap, but when the ambient temperature rose to 70℃, the waveforms began to appear non-coincidence, and there was a problem of loss of duty cycle. For this reason, I would like to ask what causes this phenomenon?Is there any reasonable solution? 



NOTE: CH2 is the test waveform of INA/B to GND, CH4 is the test waveform of OUTA/B.

Thank you for your support!

Regards,

Danilo