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The Power Management Board (PM Board) serves the purpose of a Power Module as well
as a Power Distribution Board. In addition to providing regulated power to Pixhawk 4 and
the ESCs, it sends information to the autopilot about battery’s voltage and current
supplied to the flight controller and the motors.
To power Pixhawk 4, connect one of the PWR ports of PMB to one of the POWER bricks
of Pixhawk 4. The PMB’s input 2~12S will be connected to your LiPo battery. The
connections of PMB, including power supply and signal connections to the ESCs and
servos, are explained in the table below. Note that the PMB does not supply power to the
servos via + and - pins of FMU PWM-OUT.
The image below shows the power management board provided with Pixhawk 4.
* Note: If using a plane or rover, the 8 pin power (+) rail of FMU PWM-OUT will need to
be separately powered in order to drive servos for rudders, elevons etc. To do this, the
power rail needs to be connected to a BEC equipped ESC or a standalone 5V BEC or a 2S
LiPo battery. Be careful with the voltage of servo you are going to use here.