DRV8704: Chopping output

Mathew Locoteta

Part Number: DRV8704
Other Parts Discussed in Thread: DRV8701, TIDA-00145

Hi,

I just wanted to confirm there is no way to know when the DRV8704 enters a current chopping mode. I'm seeing this is the only thing that is missing when moving from the DRV8701 (SNSOUT feature).

Is there any way to obtain when the IC enters current chopping mode? I didn't see anything in the SPI outputs for this.

Thank you!

Mat

over 7 years ago

0 Rick Duncan over 7 years ago

TI__Guru** 114905 points

Hi Mat,

There is a way with external circuitry. Please refer to www.ti.com/.../TIDA-00145 as an example.

Figure 16 shows how to add a few components to allow monitoring the outputs for chopping (assuming slow decay when chopping).

0 Rick Duncan over 7 years ago in reply to Rick Duncan

TI__Guru** 114905 points

Hi Mat,

Sorry, I forgot the document inside TIDA-00145. It is Figure 16 of www.ti.com/.../tidu301a.pdf

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DRV8704: Chopping output