Current consumption of devices
The specs give you a set of limits you must not exceed. Input current is one of those limits. It is not something you choose directly: it is a result of the input voltage (which you select), the efficiency (which you don't select, but can probably be found elsewhere in the documentation) and the output power, which is determined by the output voltage(s) (which you select) and the output current(s) (which are set by the things you connect to the outputs).