A power supply is provided. The power supply is comprised of a first power module, a second power module, and a controller. The first power module is capable of delivering a first preselected amount of power. The second power module is capable of delivering a second preselected amount of power. The first and second power modules are coupled together to be capable of delivering an aggregate amount of power related to the first and second preselected amounts of power. The controller is adapted to selectively enable the first and second power modules to make power available in one of the first preselected amount, the second preselected amount, and the aggregate amount.