Data Sheet

Power for the board’s logic needs to be applied to GND and VCC and must be between 2.5 V and 5.5 V. A

5 V regulator would be a good choice for the logic power supply. A 3-cell NiMH battery pack

[https://www.pololu.com/category/104/3.6-v-nimh-battery-packs] would also work, but a 4-cell NiMH battery pack can be well

over 5.5 V when fully charged and would not be suitable.

The negative side of your load supply should connect to the GND pad on the top-right side of the board, and the

negative side of the load itself should connect to the LOAD LOW pin. The two pins labeled LOAD HIGH are

internally connected and will typically be connected to both the load and the load power supply. There is a flyback

(also known as a “freewheeling”) diode between the MOSFET output and LOAD HIGH, which allows you to safely

connect an inductive load such as a motor or relay. Alternatively, the positive side of the load could be directly

connected to the load supply off of the board. The board’s MOSFET can deliver up to 3 A with VCC at 5 V and can

handle load supply voltages up to 30 V.

Power jumpers

The setup described above involves three separate power supplies. For some applications, this setup can be simplified

by bridging one or both of the power jumpers on the bottom of the board.

Here are some alternative options for powering your system with fewer than three power supplies:

• If the VRC supply from the RC receiver is between 2.5 V and 5.5 V, then you could bridge the VCC=VRC

jumper in order to power the board from VRC and avoid the need for a separate logic power supply connected

to VCC. Alternatively, supplying power to VCC and bridging VCC=VRC could allow you to power your RC

receiver from the RC switch.

• If your load supply is between 2.5 V and 5.5 V, then you could bridge the VCC=load supply jumper, allowing

you to power the board from either the LOAD HIGH or VCC pin.

• With both jumpers bridged, the whole system can be powered from a single suitable source.

3. RC Switch with Small Low-Side MOSFET Page 11 of 35