Hi,
Our customer designed the circuit shown in the diagram below, fabricated a prototype board, and evaluated it.
When operated by applying 5V from the PC (USB), the PCM2906C generates abnormal heat.
(Although I have not specifically measured it, it is at a level that you cannot touch it with your fingers for a long time.)
(The current flowing through the board is several tens of mA.)
There was no consideration given to the voltage drop caused by the Schottky diode.
The voltage applied to VCCCI from the outside was set to 3.3V (lower than the 3.3V generated inside the PCM2906C due to the diode voltage drop).
I suspect that this is one of the causes, but what could be the cause of the abnormal fever?
When working properly, θJA = 64.5 °C/W according to the data sheet.
ΔT=64.5 x 0.28W=18.06℃
Therefore, I believe that the device does not generate much heat.
Best regards,
Hiroshi
