Tool/software:
hi.
I configured a 2-cell charger using bq25887.
It performs the charging function in the default state without controlling it via I2C. (When the charger adapter is inserted, the MCU turns off.)
The charging current is 5V/2.1A ~ 0.5A, and the charging works normally. (Figure 1, SW pin)
When the charging current is less than 0.5A, a high-frequency sound occurs. (Figure 2, SW pin)
What is the cause?
