Ok I am working on a custom launch controller for model rockets. I am looking at this pololu.com/catalog/product/1451 to power the igniters and an arduino for the brains. My question is instead of sending PWM to the PWM pin could I set that high and then send PWM to the inA and inB inputs to provide power to two seperate igniters and have the negitive of each igniter go to the battery ground?
Although, with some of our other motor drivers it is possible to send PWM signals to those pins, it is not really feasible to send PWM signals to INA and INB on the VNH5019 because those pins have slow response times. However, it seems like you do not need a full driver, so you might consider using two suitably powerful MOSFETs instead.