Hi All:
I designed a charger with BQ24133, but there is a problem in my design. If I plug in adapter(12V) with no battery. Q3 and Q5 is cycled on and off. I tried to increase C10 to 0.1uf and C11 to 1uf. The behavior is same. But the switching frequency is slower.
If I plug in battery first. and then plug in adapter. All function is fine.
There is a waveform of T8 and T13(C10 and C11 have been changed to 0.1uf and 1uf)
Attachment is my sch of charger part. Could anybody tell me why my circuit appear this behavior. How can I solve it.
