DD89N18KHPSA1

Diodes, rectifiers, and arrays are fundamental components in most kinds of electronics, and the DD89N18KHPSA1 is a noteworthy example in this category. To better understand its application field, operating principles, and even its shortcomings, this article will be divided into two sections.

Application Field

The DD89N18KHPSA1 is a Schottky rectifier array that works as a three-phase unidirectional switch which takes alternating current as input, and outputs direct current. As a result of its ultra-low voltage drop and better performance than more standard diode rectifying arrays, the DD89N18KHPSA1 is favored in multiple industries, ranging from automotive industry to power electronics and lighting.

In the automotive domain, the DD89N18KHPSA1 is used in stop/start systems, allowing a car’s battery to remain idle while it is not being used and then quickly delivering energy back to the starter motor when the driver presses the accelerator. This switch also is also found in automobiles’ electric motor controllers, battery management systems, and other safety-related components.

For power electronics, the DD89N18KHPSA1 is especially suitable for power supplies such as those used for LCD monitors and other electronic devices. In this instance, the switch arranges the currents to be running in a cluttered and dense pattern, but with high efficiency, and with minimal heat dissipation.

In addition, due to its thermal and electrical characteristics, the DD89N18KHPSA1 is used in lighting systems, like LED lighting. The switch is responsible for controlling the voltage supply to the LED modules, adjusting it at a safe range so that the illuminating elements don’t blow due to excessive current or electricity.

Working Principles

In order to understand how the DD89N18KHPSA1 switch works, first it’s necessary to go over the basics of its components. This type of rectifier array is composed of nine separate Schottky diodes, each with its own separate purpose, allowing it to separate positive and negative current and then direct them to the right outputs.

For each of the three phases, there is a positive, common, and negative output. All banks of the DD89N18KHPSA1 switch are connected in parallel, and it’s well-known that due to the parallel connection, an increase in current will not increase their equivalent resistance.

Furthermore, the Schottky diodes that make up the rectifier array ensure a higher speed response (and therefore better performance) for the switch and feature a low reverse leakage current, able to meet the requirements laid down in both automotive and electronics applications.

Finally, and perhaps most importantly, the DD89N18KHPSA1 is equipped with an internal metal oxide varistor, featuring an MOV1 rating, allowing to reduce overvoltage and improve safety levels in whatever system therectifier array is used in.

Drawbacks

As with any of the components that make up the DD89N18KHPSA1, there are certain drawbacks to consider. Schottky diodes, while featuring a faster response time than traditional diodes, have a lower efficiency and lower power-handling capabilities. To try and account for this, the array was designed with nine of them.

At the same time, the NPN transistors need to be of a sufficiently high rating, to prevent them from succumbing to heavy current bursts, voltage peaks, and more; all of which are quite common to automotive applications.

Finally, and as mentioned before, the varistor can only reduce overvoltage or related threats, while they cannot negate or eliminate them. As such, additional safety measures need to be taken when working with any type of power supply, in order to ensure no potentially dangerous incidents happen.