Data Sheet

3. RC Switch with Small Low-Side MOSFET

3.1. Components of the RC Switch with Small Low-Side MOSFET

Pololu RC Switch with Small Low-Side MOSFET, top labeled view.

The Pololu RC Switch with Small Low-Side MOSFET has 11 through holes spaced 0.1″ apart that fit 0.1″ header

pins.

RC interface

The GND, VRC, and RC IN pins make up the switch’s RC interface and can be connected directly to an RC receiver

or servo controller:

• The GND pin is the ground or reference voltage.

• The VRC pin connects to the RC power line. The power from VRC is not used by default, but a jumper on

the bottom of the board can be bridged with solder to power the board from VRC as described below.

• The RC IN pin is the RC signal input. The switch measures the width of pulses on this line and uses that to

decide whether to activate or not.

Power

This board involves three potentially-different power supplies:

• VCC: The VCC pin powers the basic functions of the board and needs

to be connected to a power source between 2.5 V and 5.5 V. VCC is also

the gate voltage that is used to turn the MOSFET on, so it should be noted

that lower VCC voltages will lead to higher MOSFET on resistances,

which in turn limits the maximum current the device can switch.

• VRC: The VRC pin will generally be connected the power line from

your RC system. By default, power from this pin is not used by the board,

so this pin is optional.

• LOAD HIGH: The two pins labeled LOAD HIGH will generally be

connected to the positive terminal of the load power supply and to the

positive terminal of the load.

3. RC Switch with Small Low-Side MOSFET Page 8 of 35