MXLP4KE110CAE3 Circuit Protection

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TVS (Transient Voltage Suppressor) diodes protect electronics from voltage transients. The MXLP4KE110CAE3 is a TVS diode array device specifically designed to protect a variety of electronic circuits from the damaging effects of electromagnetic interference (EMI) created by strong electrical transients. Typically installed at the input of the circuit, the device has a breakdown voltage of 18 Volts (V) and a pulse width of 10/1000 microseconds (μs). This application note will focus on the circuit and working principles that make the MXLP4KE110CAE3 an ideal choice for a variety of circuit protection applications.

The Circuit

The MXLP4KE110CAE3 consists of four series diodes—one N-channel MOSFET (NMOS) connected to one NPN BJT (BJT)—each connected to the ground through an external capacitor of sufficient capacitance. By using this diode array configuration, the device can efficiently clamp high-energy transients that occur in the circuit. Since the NMOS conducts current in both the forward and reverse directions, the device is capable of clamping both negative and positive voltage transients.

The diode array works in conjunction with an external capacitor C1, which is placed in parallel with the diode (D1) at the anode (positive) side of the circuit. The capacitor C1 provides additional protection by acting as a buffer between the diode and the circuit. When the voltage transient exceeds the breakdown voltage of the diode, C1 will begin to absorb the excess energy of the transient, preventing the diode from being damaged and dissipating the transient energy.

Working Principle

The principle of operation of the MXLP4KE110CAE3 is based on its ability to withstand high-voltage transients. In the event of a voltage transient, the diode array will clamp the voltage at its breakdown voltage of 18 V, preventing any voltage beyond the breakdown voltage from entering the circuit. The capacitor C1 acts as a buffer, absorbing any excess energy while maintaining the voltage on the diode within the safe operational range.

The MXLP4KE110CAE3 is also designed to withstand high surge currents. When a high current transient occurs, the device will clamp the current at its maximum rated current (Ippk) of 10 A. The capacitor C1 once again serves as a buffer, absorbing any excess energy while maintaining the current on the diode within the safe operational range.

Application Field

The MXLP4KE110CAE3 is ideal for a variety of circuit protection applications. It can be used to protect sensitive electronic components from overvoltage caused by proximity to a high voltage source. It is also useful for protection against EMI induced transients in car audio, HVAC systems, or communication equipment. In addition, it can be used in automotive applications to protect against voltage spike due to electrostatic discharge and radio frequency interference.

In addition, the device can be used in applications where large capacitive loads are present. In these cases, the device will provide surge protection while still allowing the circuit to function properly. The device is also useful in applications where power consumption must be minimized. Because the device can prevent excessive voltage from entering the circuit, it can help to reduce power consumption.

Conclusion

The MXLP4KE110CAE3 is a versatile TVS diode array designed for a variety of circuit protection applications. It is capable of clamping both positive and negative voltage transients and can also withstand surge currents. With an external capacitor C1, it can offer additional protection by absorbing any excess energy while maintaining the voltage and current on the diode within its safe operational range. This makes the device an ideal choice for a variety of circuit protection needs.

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