UC3843D8

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UC3843D8 is a modern, reliable, cost effective and off-the-shelf DC-DC switching controller IC that enables designs for high power step up and step down applications. It is a member of the UC3843 family of controllers, making it ideal for designs in market segments such as lighting, commercial power systems, on-board motor drive systems, and renewable energy applications, such as solar and wind power.

The UC3843D8 has a wide variety of features specifically designed to reduce the design time and effort associated with low-power and high-power industrial and consumer applications. Its design has also been optimised to maximise efficiency and reduce system cost, making it suitable for a wide range of high-performance DC-DC switching designs.

Application and working principle:The UC3843D8 integrated circuit is optimized for dc-dc step-up and step-down switching power supplies. It is specifically designed for low-power and high-power industrial and consumer applications. It allows systems to reduce design time and effort significantly in comparison to traditional discrete implementations. This is because the controller features features such as input undervoltage protection and robust frequency foldback protection, voltage and current limiting, elevated negative rail and fast shutdown, synchronous rectifier support, enhanced current mode control and improved dead time control. It also includes several low-power standby modes that lower system power consumption.

The UC3843D8 IC also has a set of control pins and comparator stages to control power MOSFETs for step-up and step-down operations. It has two PWM control pins that can switch in either phase leading or phase trailing edge configuration. It also features a switching frequency adjustment pin and slew rate adjustment pins. Furthermore, the dead time control is adjustable and independent of the power MOSFETs used.

The current mode control allows for increased system stability, improved load accountability and reduced capability of power supply design. By providing two levels of soft start, the IC has programmable delay times that allow smooth start-up and reduce in-rush current. The device also includes frequency foldback which reduces the switch frequency at high loads to optimize the device efficiency.

The UC3843D8 provides a low-power standby mode that is adjustable and independent of the power MOSFETs used. This allows the user to adjust the threshold based on the usage scenario. By having a low power consumption, it reduces the overall power consumption of the system. The device also supports synchronous rectification, which reduces losses and RDS(on) of the synchronous rectifier. This helps to reduce the system cost and improve the overall efficiency.

In addition, the UC3843D8 supports output current limiting, over-voltage protection, and input undervoltage protection. The output current limiting is adjustable, allowing for more precise current limiting. The overvoltage protection reduces the impact of an overvoltage on the system, ensuring the safety and stability of the design. The input undervoltage protection ensures that the IC is not damaged in cases of low input voltages.

The UC3843D8 IC provides a wide variety of features that enable a great diversity of applications and designs. Its low-power standby mode and synchronous rectification helps reduce system costs and power consumption. Its adjustable frequency foldback and current limiting allows for greater system stability and improved load accountability. Its adjustable dead time control, voltage and current limiting and over-voltage protection ensure reliability and safety. Its adjustable soft start delays allow for smooth power up and reduce in-rush current. These features combine to make UC3843D8 the ideal choice for a variety of low power and high power DC-DC switching designs.

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