ADD5211ACPZ-R7

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PMIC - LED drivers often serve as the most reliable and efficient solutions for supplying power to high-brightness (HB) LED backlights. Currently, high-power LEDs drivers, such as MPS’s ADD5211ACPZ-R7, have become more widely used in various applications. The ADD5211ACPZ-R7 is a high-performance LED driver designed for driving HB LED strings up to 30V, generating up to 3A of LED current. This article will discuss the application field and working principle of the ADD5211ACPZ-R7.

Application Field of the ADD5211ACPZ-R7

The ADD5211ACPZ-R7 is a Constant Current LED Driver able to provide up to 3A of DC current over a wide input from 5.5V to 32V. As a result, it is a particularly suitable LED driver in many applications with higher current requirements, including outdoor lighting, PDAs, digital cameras and cell phones. As the LED current is continuous, it yields higher light efficiency than any pulse-width modulation LED driver, consuming less power and reducing thermal loading. With respect to reliability, the device also features a current-mode control, helping to improve the output accuracy of the driver without compromising its reliability. Furthermore, the device also comes with protection against over-current, open load and short-circuit protection.

In addition, the input voltage range has been expanded from 5V to 35V and can operate from 4V through 6V. This provides designers with the flexibility to drive high-brightness LEDs from a wide range of input voltage sources, ranging from an AC/DC adapter for applications such as PDAs and cell phones, to a DC/DC buck or boost converter for tablets, TVs and other consumer electronics.

Working Principle of the ADD5211ACPZ-R7

The current-mode control in the ADD5211ACPZ-R7 device significantly improves the accuracy and stability of LED output current. In this case, the LED current is regulated by a feedback loop that ensures an accurate differential current from pin IN to pin OUT. By monitoring the LED current, this feedback loop provides a strongly stable and precise LED current. This increase in LED current accuracy also reduces thermal loading and power consumption.

Besides, the ADD5211ACPZ-R7 device is designed for simple system configuration. The device provides built-in transconductance error amplifier and numerous external connection options, allowing for easy connection to external MOSFET, current sensing resistor and external capacitor. The device is also packed with a variety of protection functions such as overcurrent/short-circuit protection, open load protection and thermal shutdown protection.

In addition to the high accuracy, excellent thermal stability and configurability, the device also has a wide range of benefits. The integrated high efficiency PWM allows for a spectrum of dimming options, while the wide temperature range ensures reliable operation in harsh environments. Furthermore, the device also provides an efficient current-mode control, enabling the design to be implemented in cost-sensitive solutions.

Conclusion

The ADD5211ACPZ-R7 is a high-performance LED driver designed for driving HB LED strings up to 30V, generating up to 3A of LED current. Thanks to its precise current-mode control, it yields higher light efficiency than any pulse-width modulation LED driver, consuming less power and reducing thermal loading. Its wide input voltage range and numerous external connection options also make it a suitable LED driver for various applications ranging from PDAs to consumer electronics. Moreover, its thermal stability, configurability and various protection functions can increase its reliability and safety for many applications.

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