Motor Driver Question

Hi all!

I have a question regarding motor drivers. The specific one I'm using is the Allegro A3901, but this should apply to most drivers (like the L298). The question is, If I wanted to connect a single motor with paralleled outputs (see image: http://imgur.com/XGHU2), would it be possible to connect IN1/IN3 together, and IN2/IN4 together? The recommended schematic shows all four inputs being connected to individual MCU pins, but I feel this is a waste! Also, is there any advantage of connecting the motor like this? Can it draw more current this way as opposed to just connecting it to OUT1 and OUT2 and leaving OUT3/OUT4 unconnected?

Thanks!

nanohex: If I wanted to connect a single motor with paralleled outputs (see image: http://imgur.com/XGHU2), would it be possible to connect IN1/IN3 together, and IN2/IN4 together?

That is precisely what you should do. If you drive the 2 channels from separate input pins, then unless you are very careful, there will be times when you drive the 2 channels in opposite directions, which is likely to damage the chip if the outputs are paralleled. I'm surprised that didn't show the inputs paralleled in Fig. 3.

PS - Fig 6 on the datasheet does show the inputs paralleled.

Thanks a lot, I thought as much!

The datasheet implied this from the first figure, but as you said it shows paralleled inputs on fig 6 (cbb to read it all...)