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When does reverse current occur in a FET?
Reverse current is when there is a higher voltage at the output of a system than at the input, causing current to flow backwards through the system. There are two common sources of reverse voltage: (1) when power is disconnected from a system and (2) when the body diode of a FET becomes forward- biased.
What should the reverse current be in a battery protection circuit?
Be aware of that a lot of schottky diodes have pretty high reverse current leakage, so make sure you choose one with a low reverse current (around 100uA will be fine) in a battery protection circuit. At 5 amps the power loss in a schottky diode will typically be: 5 x 0.4V=2W versus an ordinary diode: 5 x 0.7V=3.5W.
When does a self protected MOSFET go on?
This self-protected MOSFET uses a temperature sensor and thermal shutdown circuit to protect against over-temperature. This circuit is active when the MOSFET is on and is triggered once a threshold temperature, typically 175°C, is exceeded.
What happens when the MOSFET is switched off?
This means that when the MOSFET is switched off, i.e. the input to the device is grounded, and the voltage of the drain pin rises above the Zener stack voltage, current will flow via the Zener and input resistor to ground.
Do you need diode to block reverse current?
To block reverse current using only the input and output nodes you need a diode, or a circuit that simulates a diode (ie. measures the voltage drop or current flow from one side to the other, and derives a control signal from its polarity).
When does a solid state relay switch on?
A solid-state relay (SSR) is an electronic switching device that switches on or off when a small external voltage is applied across its control terminals.
Which is low cost AC solid state relay?
The low-cost AC solid-state relay (SSR) with MOSFETs reference design is a single relay replacement that enables efficient power management for a low-power alternative to standard electromechanical relays in thermostat applications. This SSR reference design is the base model of the self-powered SSR providing a low-cost solution for low-cost