The pioneer kit, CY8CKIT-042 can be powered externally by supplying power through the VIN header (J11). The allowed voltage range for the VIN is 5 V to 12 V. The LDO regulator regulates the VIN down to 3.3 V.
The 043 prototyping kit can be powered directly by connecting the power supply to the P4.VDD pin.
Note that this prototyping kit does not have any onboard ESD protection circuitry. Therefore, the power source for the PSoC 4 M-Series Prototyping Kit must be of a high quality to ensure that the board is protected from any over-current conditions and swapped-power connections.
Please refer the kit guide for more details.