LP8556SQE-E08/NOPB

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The Integrated Fixed Frequency LED Driver LP8556SQE-E08/NOPB is a high step-up, high-efficiency LED driver from Texas Instruments. It has been designed for driving high power LED strings in automotive and industrial lighting applications, enabling a continuous adjustable output current with the use of an external resistance or an external PWM signal. The LP8556SQE-E08/NOPB features an advanced array of features and has been designed with the user in mind.

Application Field

The LP8556SQE-E08/NOPB is ideal for automotive and industrial lighting applications, such as backlighting and displays, exterior lighting, and general illumination, providing unique benefits such as high current accuracy, high efficiency, overcurrent protection, and high temperature operation. The device offers wide input voltage from 5.5V to 24V, and continuous adjustable output current from 0mA to 500mA with an external resistor. This allows for a scalable design with a wide range of LED options.

The LP8556SQE-E08/NOPB also features a range of protection and diagnostic features. These include LED open and LED short circuit protection, and overcurrent protection. These features ensure reliability and safety, while providing enhanced performance.

In addition to its wide range of features, the LP8556SQE-E08/NOPB also incorporates a precise current-sense amp and over temperature protection. This allows for a highly precise and consistent current while protecting against over-temperature conditions. As a result of these features, the LP8556SQE-E08/NOPB is ideal for LED strings under stringent lighting requirements.

Working Principle

The working principle of the LP8556SQE-E08/NOPB is based on a Boost/Flyback topology where an inductor is used to store energy during the active part of the switching cycle. During the rest period of the switching phase, the inductor delivers energy to the output. This topology enables a continuous output current adjustment and high efficiency.

The output current is adjusted through the use of a current-sense amp that detects the current being delivered to the output. This information is used to adjust the duty cycle (the ratio of active to rest time of the switch) to maintain the desired output current. The duty cycle is then regulated by the PWM input, or by an external feedback resistor, depending on the operating mode.

The LP8556SQE-E08/NOPB also offers a wide range of protection features. These include overcurrent, LED open and LED short circuit protection, to ensure safe, reliable operation. The over temperature protection feature monitors the junction temperature of the device, and will shut down the output if it exceeds the programmed threshold value.

The LP8556SQE-E08/NOPB is a high step-up, high-efficiency LED driver that has been designed for driving high power LED strings in automotive, industrial lighting and general illumination applications. It offers a wide range of features and benefits that enable the user to design a highly efficient and precise LED backlight solution with the use of an external resistor or PWM signal.

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