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We have a 2 cell Li charger in a product. We have had several products returned from the field with overheated BQ2057 IC's that melted plastic and wires. I can replicate this problem by shorting the battery terminals on the charger. Any ideas on what is going on?
What is the input current doing during the short? What is the power dissipated?
Not sure why you are using Q2, but short across the DS and take that variable out of the circuit.
Need waveforms of each pin of the IC to really see what is happening.
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