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Dear all：
We recently A bluetooth speakers in the design, the following problems when debugging charging part of the circuit, when A 4 day charge lithium battery voltage to nearly 16.8 V (STAT1 \ STAT2 \ PG each mouth is normal, the battery voltage range: about 16.2 V to 16.8 V), if pull the adapter DC plug, then A point there will be A voltage (A point after 1206, 1 K of the discharge resistance), higher than the battery voltage of 0.4 V or so, assuming that the battery voltage of 16.3 V, then point A voltage of 16.7 V.At this time, the voltage at point B is 11.6v (the normal voltage should be close to the battery voltage, and only when Q1 is turned off). The STAT1, STAT2 and PG states show that the adapter is still plugged in and the battery is still charging. The waveform at the connection point of L1 and C6 changes, as shown in the attached figure.
If the battery voltage is less than 16.2v, remove the DC head of the adapter when charging (charging current, STAT1\STAT2\PG ports are in normal state), then the voltage at point A is 0V and the state is normal
What is the probable cause of this situation?Is there a solution?
