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LSM545GE3/TR13 Application Field and Working Principle

Overview

The LSM545GE3/TR13 is a single rectifier diode, capable of handling up to 30 V and 15 A. It is available in several packages, such as TO-220 and SOD-123. It is typically used in switch mode power supplies, DC-DC converters, relay or contactor coils, battery charging and uninterruptible power supplies (UPS).

Application Field

The LSM545GE3/TR13 is a unidirectional device, primarily designed for applications where Rectification, freewheeling or a high speed switching applications are required to be implemented. It has a very low recovery time, making it suitable for high frequency switching applications, such as in switching power supplies, DC-DC converters, relay or contactor coils, battery charging and uninterruptible power supplies (UPS).

It is also often used as part of a voltage-multiplier circuit (e.g. in a 3-phase AC-DC converter), as it can handle high forward current, enabling the circuit to work at high efficiency.

Working Principle

The operating principle of the LSM545GE3/TR13 is based on the physical phenomena of PN-junction breakdown. When the anode voltage exceeds the breakdown voltage and avalanche current flows, a small low-voltage rise is observed across the diode. This diode is capable of surviving high-energy bursts and high transient energy of reverse current.

In forward bias, since the PN-junction is forward-biased, holes are recombined with electrons, thus it works as a rectifying semiconductor component. The LSM545GE3/TR13 has a very low conduction voltage drop of 0.7V, making it suitable for high efficiency applications such as switch mode power supplies, DC-DC converters, relay or contactor coils, etc.

In reverse bias, when the anode voltage exceeds the breakdown voltage, a large avalanche current will flow and a small low-voltage rise can be observed across the PN-junction. This feature makes it suitable for high-energy surge protection, overloading in switch-mode applications and for introducing a delay in reverse bias.

Conclusion

The LSM545GE3/TR13 is a single rectifier diode, capable of handling up to 30 V and 15 A. It is frequently used in switch mode power supplies, DC-DC converters, relay or contactor coils, battery charging and uninterruptible power supplies (UPS). Its operation relies on the physical phenomena of PN-junction breakdown and forward bias. In consequence, it is suitable for high efficiency applications such as those mentioned, providing high current handling capabilities and low voltage drop.

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