The problem isn’t really with your adapter, it’s the amount of power the thing needs to work correctly.
I have put up a post here that shows how to use a powered USB hub to make it work.
I, along with many others, have never been able to get a Pioneer controller to work just off the power supplied by the camera adapter as the iPad (or phone) doesn’t kick out enough juice to keep it on.
Have a look at my other post and that should guide you in the right direction of getting it working.
