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BQ76PL536 sampling problem


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In the test BQ76PL536PAPT sampling process, it is found that when a channel inputs a signal with periodic interference, the BQ sampling is abnormal. We superimpose a 1KHz peak-to-peak 5V square wave into the BQ sampling circuit, which will act on the CELL2 channel equalization MOS tube to achieve periodic changes in the input voltage.
Finally, a triangular wave with a period of about 17s is obtained. I don't know where the problem is.

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