I'm trying to use an Allegro 3952 as part of a circuit that will drive a robot motor at 3v (4.5v max) at 1Amp max. I've followed the 3952 datasheet info and the circuit works...but not enough amperage seems to be coming out of the circuit to drive the motor.
I tried Vbb at 6V and 5V, Vref/Vcc at 5V, have an RC circuit, and have a sensing resistor (tried 0.5 ohms). With Vbb at 5V, the difference between OUTa when high and ground is 4.4v and -4.4v for OUTb. The difference between OYa and OUTb when one is high is 3.8v. A small amount of current (about 0.15A) seems to trickle through to move the motors a bit when I apply OUTa and GND to the terminals of the motor....but not much. Almost no current trickles out when I apply OUTa and OUTb to the terminals of the motor.
I'd ideally like to tie OUTa and OUTb to the terminals of the motor in order to control the direction of the motor.
Gordon McComb's robot book mentions the 3952 as a decent candidate for an H-bridge but I seem to be missing something (Gordon...if you're out there and have a suggestion...it will be appreciated).
Thanks in advance for any input!
Regards,
Paul
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