Tool/software:
Hi,
We are trying to use BQ25756 for Solar Street light Application with output power requirement of 250W.
Mostly during programming/ debugging of external controller, mosfets are getting damaged, but its not limited to this, sometimes they got damaged during normal operation.
We have entered in a very critical phase now, its our 3rd attempt to make this product, but we are continuously getting this result.
We have used external supply of 10V for "DRV_SUP". But after having this issue, we reduced output to 7V (by changing Resistor, R2), but still Mosfets are not living up.
Previously (2nd attempt) we used 80V Mosfets "IAUCN08S7N013ATMA1".
This (3rd) time we have used 100V Mosfet "'GT010N10TL".
Attached is the schematic. Mostly M2 or/and M4 are getting damaged.
Input Solar Panel: 500W, 46V.
Battery: 2 x 12V [40AH] in series.
Output (LED): (40V 1.25A) x 2 in parallel.
We will highly appreciate your quick response.
Thanks,
Muhammad Saad Tariq.