>
> PWMing the direction pin (IN2) with the other pin held low means you are
>
reversing the voltage across the load on every PWM cycle (like a Class D
> amp) rather than the more conventional method of keeping one side of the
> bridge in a static condition.
>


Not uncommon. It's called Locked Antiphase.



> PWMing the 'enable' pin (IN1) with the other pin controlling direction
> means
> that in one direction you would be braking the motor during the high part
> of
> the PWM, and in the other you would be letting it freewheel.
>

Various versions of this are also common, "fast decay" "slow decay" and
"mixed decay" should be useful search terms.


-Denny
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