Hello,
I am dealing with an issue regarding DRV8823 DC motor driver and I would like to explain it in this forum in order to check if anyone has dealed with it before.
I have checked it in my design and also in the evaluation board and the consequences are the same:
1.- I apply 9V to "VM" without any DC motor connected
2.- Pull up "RESETn" pin
3.- Pull up "SLEEPn" pin
4.- Pull down "SLEEPn" pin
5.- Pull down "RESETn" pin
6.- Switch off VM
Then both FET connected to VM in the H-bridges start to be enabled and few minutes later I get a "wonderful" short-circuit between H-bridge outputs that I would like to avoid. Impedance between xOUT1/2 is around few Ohms (3 Ohms) but several minutes or even hours later those FET turn off and I get an open between xOUT1//2 outputs (Mega Ohms).
I would like to get an open between H-bridge outputs as soon as I turn off VM power supply.
I have tried with a higher VM voltage but the problem is still there. The measured voltages at driver pins are the following ones:
VM = 9V
VCP = 16.8V
V_CP2 =12.7V
V_CP1 = 4.3V
V_ABVREF = V_CDVREF = 3.3V
>> Has anybody dealed with this problem before?
Any help will be great.
Regards
Ismael
