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A49xx-Slide14

When in slow decay the current in the winding is recirculated through the low side MOSFETs. Because the voltage across the MOSFET is small, the current in the winding decays more slowly resulting in low current ripple. As the step rate increases, slow decay can cause problems with current regulation. As is shown here in the illustration, when the current in the load is falling, slow decay can prevent the load current from reaching the next step programmed by the translator. One way to combat this effect is by using fast decay.

PTM Published on: 2013-06-05