Part Number:BQ24172
I am using the BQ24172 to charge a 3-cell battery. I refer to the evaluation board circuit and built my PCB. The target is to charge the battery with 2A current. The input power is supplied from a 15V, 6A power adapter.
I have tested the battery by charging it with a standalone charging station at 2A current and verified it is okay.
When I switch on the power adapter, the LED (the STAT pin) light is ON without blinking. I guess it means there is no error on the circuit.
I connected an ammeter in between the battery and the PCB so that I can observer the charging current. I found that the charging current does go up to about 1.6A for a few seconds, then it drop back to 0. This iterate for a few times and then the current stopped.
The battery is originally at about 10.5V.
In the circuit I am connecting the TS equal to the evaluation board circuit by using a fixed resistor value.
I attached a table of the parameters I used on the circuit board, such as charging current, regulated voltage, and etc.
Can you give me any hints where can go wrong?
Thank you very much(Please visit the site to view this file)