XR77128ELB-F

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

DC DC switching controllers are critical components on Printed Circuit Boards (PCBs). The XR77128ELB-F is among the most popular DC DC switching controllers available on the market. It is a high performance, low cost, integrated solution for implementing Cost, Size, and Performance optimized switching control for applications such as Post Regulation, Polyphase Regulation, and Step-down Converters. In this article, we will look at the application field and working principle of the XR77128ELB-F.

Application Field of XR77128ELB-F

The XR77128ELB-F is suitable for multiple applications, such as various telecom power supply, computer power supply and industrial control system. It is best suited for PoE (Power over Ethernet) products such as Ethernet switches, routers and IP phones. Additionally, XR77128ELB-F is applicable to voltage regulators, synchronous buck converter, DC/DC converter, isolated DC/DC converter, fly-back converter and output AC/DC or DC/DC converter.

Working Principle of XR77128ELB-F

The XR77128ELB-F is based on a proprietary Pulse-Width-Modulation (PWM) scheme and dynamic response technology. It provides intuitive and flexible parameter settings, thereby allowing designers to quickly set up and optimize their power solutions. In addition, the device is capable of entering into skip cycle mode when the output voltage is lower than the selected regulation voltage, resulting in improved efficiency and cooler operating temperature.

In normal mode, the XR77128ELB-F implements a fixed frequency PWM mode with a constant on-time scheme. When used in a synchronous buck converter, the device works by gating (or turning on and off) a synchronous rectifier MOSFET based on the internal PWM clock. The on-time of the MOSFET is determined by the external variable-resistor and capacitor components. Once the appropriate duty-cycle has been determined, the output voltage regulation is achieved by adjusting the duty-cycle.

In skip cycle mode, the XR77128ELB-F implements a clock agnostic mode which just needs to know when to reduce the duty-cycle to enter into skip cycle mode. The device will skip pulses based on the voltage feedback to the device, thereby allowing designers to achieve significant power savings in their power designs.

Conclusion

In conclusion, the XR77128ELB-F is a high performance and cost effective DC DC switching controller suited for multiple applications. With intuitive parameter settings, dynamic response technology and skip cycle mode, the XR77128ELB-F is an ideal solution for designers looking for advanced power solutions.

The specific data is subject to PDF, and the above content is for reference