Dear TI team,
I have used your DRV8701E IC to build my DC motor(18V~40V, 10A, 820N) Full bridge control using NXP MOSFET (PSMN014-40YS) .
I have used your DRV8701 evaluation board as circuit reference for my design and i have verified the HW for proper connection.
Currently I am am able to drive the MOSFET under no load (i.e. when DC motor is not Connect).
So when VM is 20V at Idrive (150 / 300 mA) and I get perfect output of +20V on forward drive or -20V on Reverse Drive, when there is no Load.
Gate drive (GHx 0v to 9.5v and GLx switched from 9.5V to 0)
The moment I connect the DC motor, The output Voltage drops to +1.5V and -1.5V and current saturate to 0.1A.
Gate drive (GHx 0 -->0.8 and GLx switches from 9.2 --> 8.2)
I know for a fact, the MOSFET PSMN014-40YS with traditional NPN gate drive circuit works fine with this DC motor. So i am guessing there is something wrong in the design.
Could you please help me.
Regards
Sugandar