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TVS - Diodes: MXLSMBG130CA application field and working principle

Transient Voltage Suppressor (TVS) is a device used to protect sensitive electrical equipment from transients or surges that are caused by Electrostatic Discharges (ESD), electrical fast transients (EFT), and lightning. A typical TVS diode, such as the IXYS MXLSMBG130CA, is a P-N junction device whose working principle is based on the avalanche breakdown effect. This step-down diode is designed to protect three-phase systems between the range of 275 VAC and 480 VAC with a peak pulse power of up to 5 kW.

The MXLSMBG130CA is available in a variety of packages, such as the D26 substrate, which is the most common type used in three-phase applications. The D26 substrate is designed to absorb large amounts of energy with very low resistance values and a wide operating temperature range, making it suitable for use in industrial and other harsh environments.

Operating Principle

The operating principle of the MXLSMBG130CA is based on the avalanche breakdown effect. This is a phenomenon that occurs when the voltage applied across a P-N junction diode exceeds the breakdown voltage of the diode. As the voltage increases, the electric field across the junction increases, leading to an increase in the current. This increase in current causes a further increase in the electric field, which in turn leads to more current. This process leads to a sudden increase in current, known as an avalanche breakdown, which is what enables the diode to protect components from transients.

In operation, the MXLSMBG130CA is configured in a series of parallel assemblies, each with its own P-N junction. When a transient occurs, the voltage across the P-N junction increases, causing the current to increase rapidly. This current surge is dissipated across the series of diodes, protecting the components from possible damage.

Applications

The MXLSMBG130CA is commonly used in three-phase systems as the primary surge protection element. It is also used in television sets, computers, and other household appliances to protect against electrostatic discharges and lightning. This diode is also suitable for use in automotive applications, due to its wide temperature range and low resistance values.

Overall, the MXLSMBG130CA is an ideal choice for protecting electrical components from transients, ESD, and EFT. It can easily be configured in series or parallel depending on the specific requirements of the application, making it an extremely versatile solution for surge protection.

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