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Initially the driver implements fast decay with synchronous rectification. This is effectively a direction change and results in a short of the BEMF voltage in the load, resulting in rapid current decay. After 50% of the off-time, the device enters slow decay. When the current regulation is close to zero, there is load reversal protection which prevents the current from changing polarity during fast decay by sensing the current level and automatically switching to slow decay. This results in discontinuous load current, but prevents potential reversal of the motor.
PTM Published on: 2012-08-08
