[L6472] 1.3A output when power on without chip init

[edwardfung]

Posted on May 12, 2016 at 04:51

Hi,

We got a problem for L6472 chip when power on, the H-bridges is ON with default current output at 1.31A while the /STBY\RST=VDD  and SW = 0V states.  However, when the  /STBY\RST=VDD  and SW = VDD, the H-bridges keep at Hi-Z state without any current output.

This 1.3A current causes 0.5A motor damage when  at home position (SW=0V) when power up. 

Does the chip behaviour is normal? and any workaround to eliminate this?

Thanks,

Edward

[AKurp.10]

Dear Edward,

Have you found a solution to the problem? I am facing the same issue, and since my device will almost always power up with SW closed, the problem is serious. I would greatly appreciate you answer.

Thanks,

Artur

[AKurp.10]

Hi,

the simplest solution found on community pages - start setup with 'HardHiZ' command.

I put it here, just in case someone looks for power-on problems solutions.

Best regards,

Artur