I am trying to figure out the bulk capacitance needed for a stepper driver circuit. I calculated that i need at least 6 uF of bulk (i = C dV/dT).
If my motor takes 1A, then I should get a ripple current of at least 1A, correct?
When I look at digikey, there is a low frequency ripple and a high frequency ripple. When I pick this, do I pick the rating based on my step speed? So, if I am giving the driver pulses at a frequency of 200 Hz, then I care more about the low frequency ripple as opposed to the high frequency? From what I am seeing, low frequency ripple is always much lower than high frequency unless I really get a high cap value (like 100uF). Or am I thinking about this wrong?
If my motor takes 1A, then I should get a ripple current of at least 1A, correct?
When I look at digikey, there is a low frequency ripple and a high frequency ripple. When I pick this, do I pick the rating based on my step speed? So, if I am giving the driver pulses at a frequency of 200 Hz, then I care more about the low frequency ripple as opposed to the high frequency? From what I am seeing, low frequency ripple is always much lower than high frequency unless I really get a high cap value (like 100uF). Or am I thinking about this wrong?