MF72-047D15-LI

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Inrush current limiters (ICLs) are one of the most common components used in power supply systems. They’re designed to limit the inrush of current in power systems, avoiding short-term current overloads that can cause damage and component failure. One of the most popular ICLs is the MF72-047D15-LI.

The MF72-047D15-LI is a temperature-compensated, negative temperature coefficient (NTC)-based clamp circuit. It consists of an NTC thermistor and a high-speed, stable, high-current shunt switch, and it operates in a range of -40°C to +85°C. It provides current limiting and over-temperature protection against catastrophic failure or permanent over-load due to a spike or pulse, and its high inrush current limiting threshold makes it highly suitable for AC-DC power supply applications.

The main function of the MF72-047D15-LI is to limit the inrush current in power systems, but it also has other applications in the automotive, industrial, and telecommunications sectors. For instance, it is used in DC motors, AC inverters, DC-DC converters, AC-DC converters, and other power systems. It is also used in automotive applications for brake lights, airbag systems, fuel pumps, and more.

The working principle of the MF72-047D15-LI is relatively simple and is based on three components- the NTC thermistor, a shunt switch, and a control circuit. The thermistor is connected in series with the load, and its resistance decreases with increasing temperature. The shunt switch is connected between the source and the load, and it acts as a switch to either allow or block current when the thermistor\'s resistance changes. Finally, a control circuit is used to monitor the temperature and to trigger the shunt switch accordingly.

When the power is applied, the thermistor will heat up, causing its resistance to decrease. When the resistance ofthe thermistor drops below a certain value, the shunt switch will be triggered and the current through the thermistor will be limited, thereby protecting the system from an excessive inrush of current. The control circuit will then monitor the thermistor\'s temperature and turn off the shunt switch when the temperature reaches a certain level, thus preventing the system from overheating.

In conclusion, the MF72-047D15-LI ICL is an effective device for limiting inrush current and preventing damage to power supply systems. Its temperature-compensated design and high-speed, high-current switch make it suitable for a variety of automotive, industrial, and telecommunications applications.

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