We chose PFM-mode to improve "efficiency" of this device at light load.
During the evaluation, an abnormal unit higher than the average current consumption was found.
While looking for the difference from the normal unit, I found a difference in the attached waveform.
Since the output voltage is regulated to 3.3V, I think that the control system circuit is operating normally but that the inductor performance is not working.
I think the inductor is in failure mode, short circuit.
What is the cause of the failure ?
The cause is considered as follows:
・Input overvoltage
・Output overcurrent
・External heat stress
I think that the cause of the failure to be external heat stress.
I want to identify whether the steps that occurred were due to operations or manufacturing processes.
Please tell me the suspicious cause.
Please Best regards.