B57237S100M54

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Inrush current limiters (ICL) are essential for protecting power circuits from inrush currents. The B57237S100M54 is an example of an ICL that offers a number of protective functions, and this article will discuss the application field and working principle of the B57237S100M54 in more detail.

The B57237S100M54 is mainly used in AC/DC converters with a wide adaptation range to supply small-power electronic systems. This ICL works with rectifiers with diode commutation and can suppress high inrush currents to a maximum of 100 mA. Furthermore, the B57237S100M54 can protect the power circuit against higher currents, sparks, and surges.

The main components of the B57237S100M54 are two NTC resistors, a Zener diode and a hysteresis comparator. The two NTC resistors (R1 and R2), and the Zener diode (D1/D2) form what is known as the ‘triangle method’. This method is based on the results achieved by connecting two thermistors or NTC resistors in a triangle configuration, whereby each resistor serves as a temperature or current limiter.

The B57237S100M54 works by using the two NTC resistors and the Zener diode, which act as a bridge or current measuring circuit, to measure two different voltages. The first voltage (Vref) is produced by the Zener diode, and the second (Vmeas) is produced by the two NTC resistors. When an inrush current flows through the circuit, the two NTC resistors produce a peak voltage that is higher than the reference voltage. This anomaly is registered by the hysteresis comparator, which then helps reduce the current going through the circuit by turning off the corresponding components.

In terms of the working principle, the current limiter is activated when the current through the circuit rises above the pre-programmed limit. When this happens, the current is reduced by the hysteresis comparator, which turns off the components. The current is then decreased gradually until it reaches a safe level, at which point it will be maintained.

Aside from protection against inrush currents, the B57237S100M54 can also protect against short-circuit and overload conditions, and reduce the temperature in the power supply circuit. This ICL also offers a proven record of reliability and ease of installation. It is designed in a compact package, making it suitable for use in tight spaces.

In summary, the B57237S100M54 is an inrush current limiter that can protect power circuits against inrush currents, sparks, and surges. It works by using a triangle method and a hysteresis comparator to reduce the current in the circuit. The B57237S100M54 can also protect against short-circuit and overload conditions, and is suitable for use in tight spaces due to its compact design.

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