I've been working with http://www.pololu.com/file/0J51/vnh3sp30.pdf
I bought from Pololu. I bought only the ICs and not the boards. I made my own board and I'm facing some major issue:
While running the motor driver for smaller motors which consume close to 500 mA, I face no trouble at all. But as soon as I move into a larger range of 1 Ampere motors or above, my VNH stops responding altogether. It pulls my inputs low, which is something beyond me. This means that if my input voltage is 5 Volt at Input A and GND at Input B, both are pulled down to ground (-0.3 volt actually). The board doesn't heat up, doesn't indicate in any way that there is any kind of thermal shutdown, but thats it.
Now the 5 volt input I gave above was from an Atmega 16, when I give it an output from a SMPS, the motor suddenly starts running perfectly. I'm thoroughly confused here..Could anyone help me out with schematics of their own boards/anyone who has worked on this particular IC, could you please tell me what to do next?