Low-Side MOSFET Circuit

Using an N-Channel MOSFET as a Low-Side Switch

Let's say we wanted to control a load such as a DC motor. A very simple and efficient design would be via a low-side, N-Channel MOSFET:

In this case, the voltage between the Gate and Source is +3.3V. It enables the Gate to fill with positively charged holes, which attract the minority charge carriers from the surrounding P-Channel semiconductor, in this case, the negatively charged electrons to create an N-Channel conductor between Drain and Source:

Using an N-Channel MOSFET as a Low-Side Switch​

Using an N-Channel MOSFET as a Low-Side Switch