HI. I needed a battery charging module for an application circuit, and I made the circuit and board using the BQ40Z60EVM and data sheet.
After a few errors, the charging circuit is working properly, but VSYS is too unstable when operating only with batteries without VAC.
The VSYS voltage (12V) is measured by the DMM. However, if I connect a load using a 12V current source, the voltage on VSYS will go back and forth between 0 and 12V.
And the tic-tingling sound that is supposed to come from the inductor is heard in the circuit.
I attached log file and gg file. If someone have any probable cause, please let me know.
