Part Number: DRV8701
I need to drive a brushed DC motor in a 12V battery powered robot. I am thinking that I want to use the DRV8701 over the UCC27201 for my robotics application. My thinking was:
- The DRV8701 has a wider operating range which goes down to 6V. With a 12V battery which will be discharging and adding in some cable drop when the attached motor locks I am somewhat concerned that the UCC27201’s 8V input might not be enough.
- The DRV8701 uses a charge pump to allow 100% duty cycle operation of the high side FET. With the boost cap circuit on the UCC27201 I can’t just turn on and forget the driver as at some point it will discharge too much.
My problem is that I am looking at continuous current of about 30A and locked rotor current as high as 104A according to the motor spec I have today, but as a rule I like margin to change motors somewhat if suppliers change. The issue is with only 0.0086 inches between pads on the DRV8701 I can’t really use anything but 1 oz copper. Is there a way to use the DRV8701 with high current applications I’m missing? If I have to use the UCC27201 (or similar boost cap topology) how often does my micro need to cycle the FETs to ensure charging (there is nothing in the TI literature about what to do)?