AL5801W6-7

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An increasingly important part of modern day design, lighting and energy efficient applications is the right selection of the right LED driver. The AL5801W6-7 LED driver is a dedicated, power management integrated circuit (PMIC) designed to drive white LED loads in LCD backlighting applications. This article will explore the various application fields and working principle of the AL5801W6-7 LED driver.

Application Fields of AL5801W6-7 LED Driver

The AL5801W6-7 LED driver is a high-efficiency LED driver targeting flat panel displays and digital signage backlighting applications. It is designed to address the demanding performance requirements of image quality, contrast and color accuracy, as well as safety and energy efficiency. Due to its current matching, short-circuit, overtemperature and open circuit protection functions, the AL5801W6-7 LED driver is suitable for low power applications and LED TVs.

In addition to LED TV applications, the AL5801W6-7 LED driver is also suitable for portable and mobile devices such as tablets, smart phones, notebooks, HMIs and IoT products. The driver’s low output ripple and low power consumption makes it suitable for mobile applications, while its low quiescent current and high efficiency makes it suitable for high efficiency electronic installations such as AC adapters and laptop power supplies.

Working Principle of AL5801W6-7 LED Driver

The AL5801W6-7 LED driver features a single stage buck-boost configuration which allows for efficient, step-up and step-down power conversion. The driver consists of an upstream voltage sensing circuit, an internal PWM controller, an output current control circuit, a feedback loop and PMOS/NMOS switches. The upstream voltage sensing circuit monitors the output of the power source and the feedback loop monitors the output current of the LED string. Based on this, the PWM controller adjusts the on-time of the PMOS/NMOS switches, controlling the output current.

The AL5801W6-7 LED driver features a high efficiency current matching function which enables LED current matching with a resolution of 0.8%. This ensures uniform illumination for the LED strings. The driver also features an open-circuit, short-circuit, over temperature and surge protection, making it suitable for high power and safety critical applications.

In addition, the AL5801W6-7 LED driver features a “smart dimming” function. This function allows for dynamic dimming of the LED string, enabling the driver to achieve higher efficiency and longer lifetime by automatically adjusting the output current based on the input voltage. Furthermore, the AL5801W6-7 LED driver also features a programmable soft start function which reduces inrush current, improves reliability and safety, and prevents current and voltage peaks.

Conclusion

The AL5801W6-7 LED driver provides a high-efficiency, high-performance solution for powering white LED loads in LCD backlighting applications. It features a single stage buck-boost configuration, current matching, open-circuit, short-circuit, over temperature and surge protection, and programmable soft start functions which make it suitable for low power and high power applications. Furthermore, its “smart dimming” function enables dynamic dimming of the LED string, making it the ideal choice for energy efficient and long-lasting LED backlighting applications.

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