Contents
How are switches connected to loads?
A specific cable type is used to connect the power source to the switch and the power outlet that drives the load. There are three wires, a hot wire, a neutral wire and a ground wire within this insulated cable. The neutral wire links the other terminal to the load. The ground wire connects to the outlet.
What is a load switch IC?
The load switch IC is located between the power supply and the load. The ICs are used for power management to control the power supply to the load. Similar switches can be constructed with mechanical relays and semiconductors such as MOSFET, but load switch ICs can be miniaturized and consume less power.
What is load in a switch?
A Switch is usually placed between a Source of Power and a Device or Circuit which uses the Power. The Power Source is considered the Supply; and, the Circuit or Device is considered the Load.
When would you use a load switch?
Load switches connect loads to a common power supply under the control of an embedded microcontroller unit. Load switches are used to connect and disconnect a load from a source to power up or down, or to save energy when a load isn’t needed. They can also be used to sequence power off-on operations.
Is a battery a load in a circuit?
An electrical load is an electrical component or portion of a circuit that consumes (active) electric power, such as electrical appliances and lights inside the home. This is opposed to a power source, such as a battery or generator, which produces power.
Is a load a switch?
A load switch is simply a switch, mechanical or electronic, that connects or disconnects a load to the high side of a power source. A wall light switch is a load switch. Any off/on switch on an appliance or electronic product is a load switch. A relay can be a load switch.
What happens when a load switch is turned on?
When the load switch (Q1 in the diagram below) is turned ON, a large current much greater than the steady-state current will temporarily flow. If the charge on the capacitor is close to zero then a large inrush current occurs, voltage is supplied to the output Vo, resulting in an instantaneous and large charge in current flow.
What are the parameters of a load switch?
Several key parameters of a load switch are the ON resistance of the MOSFET that connects between the voltage input and voltage output pins, the current that the transistor can handle, and the voltage that the circuit can handle.
When does an inrush current occur in a load switch?
If the charge on the capacitor is close to zero then a large inrush current occurs, voltage is supplied to the output Vo, resulting in an instantaneous and large charge in current flow. This excessive current is often referred to as inrush current.
How is a load switch like a relay?
A load switch is an electronic component that has no moving parts, which works somewhat like a relay. Generally, two MOSFET transistors act like a switching element, one of them being an N-channel device, and the other a P-channel device. Below we will cover when that switching element is either ON or OFF, and what that entails.