Shai,
The robot rules state you must use the power convertor in the KOP.
<R38> All electric power utilized by the ROBOT shall be distributed from the load terminals of the PD Board. Circuits may not bypass the PD Board to connect directly to the 120-amp loop.
B. The radio power feed must be connected via the 5V converter (model # TBJ12DK025Z) to the marked 12 Vdc supply terminals located at the end of the PD Board (i.e. the terminals located between the indicator LEDs, and not the main WAGO connectors along the sides of the PD Board). No other electrical load can be connected to these terminals (please see the 2011 Robot Power Distribution Diagram posted online at
www.usfirst.org/frc/kitofparts for wiring information).