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Simple Switch

The heart of every load switch is the MOSFET. This diagram shows a common way to implement simple load control using discrete components. The FET M1 controls the primary load, switching the main power from the input voltage side to the switched voltage side. The resistor R1 is used to bias the gate of the FET so that a small control input voltage can put the FET into conducting mode. The second FET, M2, provides signal translation and isolation between the logic-level Control Input signal voltage and the higher voltage of the M1 FET. By applying a low voltage, low current logic level signal on the Control Input line, the M1 FET can switch a much higher current and voltage load.

PTM Published on: 2014-03-21