MF72-016D7

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Inrush Current Limiters (ICL)

Inrush current limiters, or ICLs, are devices designed to limit the current drawn by a circuit or device during cold start or inrush conditions, providing reliability against system overloads. A typical application for an ICL is in power supply applications, where the inrush of current when the device is powered up may be limited to a safe and preset level. The MF72-016D7 is an example of an ICL, designed to limit the surge current in power supplies.

MF72-016D7 Application Field

When using an MF72-016D7, the maximum DC operated current should be within the rated current range, and must not exceed the maximum current rating. The device is suitable for circuits requiring high protection against temperature, current and fatigue. Common applications for the MF72-016D7 include:

• AC/DC switching power supplies
• Uninterruptible power supplies
• Inverters
• LED lighting applications
• Battery operated systems
• Sensitivity control circuits

MF72-016D7 Working Principle

The MF72-016D7 has two characteristics: positive temperature coefficient (PTC) and negative temperature coefficient (NTC). When the voltage across the PTC is higher than the PTC trigger voltage, the PTC will have an increasing resistance, acting as a current limiter and limiting the current flow in the circuit. At the same time, the NTC will have a decreasing resistance, allowing more current to flow. This ensures that the current is limited during a start or inrush condition and then adjusts accordingly when the power supply is in steady-state operation.

The MF72-016D7 includes two PTC resistors and one NTC harmonic free resistor. The two PTCs are parallel connected, and will limit the start current by increasing the impedance level until it reaches a stable running current. The NTC is connected in series with the two parallel connected PTC resistors, and its resistance will decrease to their lower level when the power supply is operated in the steady-state mode. Because of this, the total continuous current at the steady state operating condition should be <= the MF72-016D7 rating, and the resistance of the PTC should be > the rating of the PTC.

Overall, theMF72-016D7 is an ideal device for controlling inrush current, protecting the power supply from overloads, and providing a reliable and adjustable peak current limit.

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