That is a power supply made by TaoTronics. I dont think that they sell just the power supply anywhere. I cant see the rest of the power supply to see what is compatible component wise, but if any 100 watt dimmable power supply should replace it. Again, it all depends on what how this one connects to the system.

If you plan on buying a replacement, just make sure the current spec matches and voltage output is similar. It's an AC to DC converter, just a simple driver really.

Notice it says constant current, this means the driver will try to put out that amount of current - no less & no more. The voltage will settle to the amount determined by V = IR. So look for a driver that can do 90-120V output, and constant current 630mA (less is OK, you will get less light, more is NOT OK, you will burn out LEDs)