Measuring the BEMF on DRV8801

Rodrigo Linares

Other Parts Discussed in Thread: DRV8801, DRV8313EVM

Hello , does anyone have measured the BEMF using DRV8801? I would appreciate an example of the extra circuit needed. Best Regards

over 12 years ago

0 Ryan Kehr over 12 years ago

TI__Guru 55615 points

Rodrigo,

Is this for a brushed motor? Typically how this is done in a brushless application is to HIZ the bridge momentarily and use a simpler voltage divider to limit the voltage before sending it into a DAC on a MCU.

An example of this can be seen in the schematic of our DRV8313EVM - attached.

8030.DRV8313EVM_SCH.pdf

0 Rodrigo Linares over 12 years ago in reply to Ryan Kehr

Prodigy 20 points

Thanks Ryan,

I'll prepare a PCB using your suggestion. I'll post my results. Regards

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Measuring the BEMF on DRV8801