Data Sheet

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.

The bottom of the board has jumpers that can be bridged with solder in order connect VCC to VRC or

VCC to LOAD HIGH. These jumpers provide extra flexibility in how the system is powered, and some

examples are given in Section 3.2.

Load interface

The LOAD LOW and LOAD HIGH pins are connections for your load and load supply. The LOAD

LOW pins are normally disconnected from GND, but when the switch activates the MOSFET turns on

and connects LOAD LOW to GND. There is a flyback (also known as a “freewheeling”) diode between

LOAD LOW and LOAD HIGH. 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. More details on connecting your load and load supply to the

switch can be found in Section 3.2.

Outputs and indicator LED

The RC switch provides feedback about what state it is in via a yellow indicator LED. The LED

behavior is described in Section 8. Status information is also provided by two additional outputs:

• The GOOD pin indicates the presence of a valid RC signal (10–330 Hz pulse rate,

0.5–2.5 ms pulse width).

• The OUT pin indicates whether the MOSFET is on.

When these outputs are high they will be at the same voltage level as VCC. When low, these outputs

will be at 0 V (ground). These outputs do not have resistors in series with them. Each output can

source or sink up to 25 mA.

3. RC Switch with Small Low-Side MOSFET Page 12 of 45