AnsweredAssumed Answered

Why there is no current chopping at the output coils during microstepping at lower STEP frequency input?

Question asked by Siva Murugesan on Jul 29, 2015
Dear Experts,

I am currently working with L9942 Driver IC. During micro-stepping at less than 700Hz of STEP frequency input to the driver, there is no current chopping at the output coils. At frequencies greater than 700Hz there is output for coils. The same is the case for other modes as follows:
1/4 mode: no currrent chopping at STEP frequency input less than 400Hz
1/2 mode: no currrent chopping at STEP frequency input less than 200Hz
 
Please help me understand the reason. 

Outcomes