Other Parts Discussed in Thread: DRV8305
Hello,
we are using the DRV8305NQPHPQ1 as the gate driver for our
BLDC motor control board and are experiencing a jump in the
the total current to the board from 70 mA to 390 mA when
the GATE_EN bit is set. The DRV8305 also becomes hot
(58°C). This effect is seen all boards, so it seems to be
a systems phenomenon. The schematic and layout are taken
from the datasheet for the DRV8305 (SLVSD12C).
Here the schematic of the DRV8305:
and the schematic of the half-bridges looks like this:
The driver works and it it possible to spin motors (the MosFET
switching looks good), but the chip is hot. Any ideas where all
that current is going to?
Regards,
John