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I'm told that on the L298, it's better form to use PWM on the inputs rather than on the enables, so that's what I've done.
Quote from: krich on June 10, 2008, 11:29:24 PMI'm told that on the L298, it's better form to use PWM on the inputs rather than on the enables, so that's what I've done. Are you sure about that? Where did you hear this?
For undirectional drive with a single channel the PWM control signal can be applied to either thechannel input or the appropriate enable input. >snipped discussion on unidirectional drive<The situation is different for bidirectional motors driven by a bridge. In this case the two alternatives have different effects. If the channel inputs are driven by the PWM signal, with suitable logic, the recirculation path is through a diode, the motor and a transistor (figure 7a), givind a slow decay. On the other hand, if the enable input is controlled the recirculation path is from ground to supply through two diodes and the winding. This path gives a faster decay (figure 7b).