Hi,
I made a battery pack that has Li-Ion cells. When the cells are nominal voltage level, I measured 4.5VDC (reference point is BAT+) at gate of DSG FET. During discharge, this drive voltage goes through lower voltage levels. But voltage of CHG drive pin is always 10.58VDC (reference point is PACK+).
First, I susptected from IC. Maybe IC's charge pump has problem, I can change and try it to measure again. But still the same problem. After that I susptected from capacitors that feeds charge pump circuit. Measured with LCR meter. Values are OK.
By the way, I removed reverse protection and pre-charge circuit. Maybe they are cause of this. But anything did not change.
My questions are,
- Does IC have independent charge pump for DSG and CHG pins?
- If yes, so I think I need to change again, maybe it is victim of ESD.
- If no, I need to change my FET.
2.Can you tell me please which capacitor is helping to voltage rise from drive pins? So maybe I can try different capacitances at there.
Thank you.
Best regards.
