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Problem with LT3999


Iam using the LT3999 in series with a push Pull Trafo from würth (750315371) to generate 12VDC isolated.

After a powerup, the first few seconds all works fine but then the output voltage begins to oscillate and as a result, the LT3999 is getting quite hot.

Do you have any ideas why this happens?

Maybe I should reduce the frequency (500 kHz)

In addition, i left the ILIM and RDC pins floating and UVLO and OVLO are disabled (connected to VIN, GND resp.)


Thank you for the help



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