Oh, ok. That should work then. Try pulsing low side on first to charge the bootstrap. INH_A gnd, INL_A 3.3v. Then INL_A gnd, INH_A 3.3v. Be careful not to apply 3.3v to both at the same time. I think it has protection against shoot-through, but better not find out the hard way 
If that doesn’t work, use an arduino or whatever to give it proper complementary PWM on INH_A and INL_A with duty less than 100%.
And if that doesn’t work, then you’re in the same situation I am with Gooser. I still haven’t gotten the high side mosfets to turn on properly.