|Demand Peripherals Robotics and Automation Made Easy|
PD25: Power Distribution Card
The PD25 power distribution card is a break-out card which makes it easy to control, protect, and distribute power from a battery.
The PD25 card gives you all the nice-to-have features you would want to help manage power on your robot or automation setup. It can handle up to 25 amps and has a fuse to limit the maximum current. The card uses an ATO blade style automotive so you can easily set what maximum current you want.
The PD25 provides a low current on/off switch which in turn controls five 20-amp AOD409 PMOS FETs. The FETs act as a kind of power relay for the card and using PMOS FETs lets the card switch the "high side" of the battery. Switching the high side of the battery input means that battery ground can be ground through your whole system.
A two terminal input lets you control the device remotely. This is handy for switches that have to be mounted away from the card and for timed on/off using a real-time clock card.
Power output is on four mechanically secure and easy to use screw terminals. Each screw terminal can handle at most 15 amps and the sum of all the currents through the screw terminals should not exceed 25 amps or the fuse value.
Battery charging is made easy by the inclusion of a 5.5 mm barrel connector that is tied directly to the battery. Current into this connector should not exceed 2 amps.
The input battery voltage can be sensed from two pins available on the PD25 card. The voltage is one-twelfth (0.083) of the battery voltage. The voltage sense is a little above ground and should be measured differentially for best results.