L6480H driver stall detection and overcurrent detection

[cliang]

Posted on April 16, 2015 at 16:16

In application note AN4355, overcurrent detection page 18 and stall detection page 21, application note writes two equations

Equation 1: I

OCDth

= V

OCDth

� R

ds(ON)

Equation 2: I

STALLth

= VSTALLth � Rds(ON)Why current is equal to voltage times resistance?should be use divide sign I

OCDth

 = V

OCDth

 � R

ds(ON)

How should I calculate overcurrent I

OCDth

 ?for an instance, by default, I

OCDth

 is 281.25mV, and external MOSFET R

ds(ON)

 is 33m?, what is I

OCDth equal to ?

Thank you in advance #ocd #l6480h #stall-detection-l6470

[Enrico Poli]

Posted on April 27, 2015 at 09:49

You are right, the formulas of the AN are wrong.

The actual relation betwee programmed threshold and current is I

OCDth

= V

OCDth

÷ R

ds(ON)

The typo will be fixed in the next release of the AN. Thanks a lot for your feedback! Regadrs Enrico