LP8556TME-E05/NOPB

The LP8556TME-E05/NOPB is a current-mode a high-efficiency step-up DC-DC LED driver for single LED applications. It is a versatile, robust and powerful driver, ideal for a variety of LED designs requiring high efficiency and low power dissipation. This LED driver is designed with an exceptional Auto Frequency feature which optimizes the LED power delivered to the LED, resulting in greater efficiency. The LP8556TME-E05/NOPB optimizes the voltage, current and power of the LED string while minimizing ambient temperature, thereby increasing system reliability and life span. Additionally, the LP8556TME-E05/NOPB offers a variety of advanced features including adjustable output voltage, adjustable peak current, adjustable onset voltage, and adjustable frequency control, with an adjustable output voltage that can be changed in increments of 0.1V, supporting both 1-string and 3-string LED structures.

The LP8556TME-E05/NOPB is an 8-Pin Thermally Enhanced TSSOP package rated from -40 to +105 C. The device is designed to provide constant current output and a low voltage dropout for the LED, allowing for the use of higher efficiency components. Additionally, the LP8556TME-E05/NOPB is a versatile driver, as it can be used as a bridge driver along with TI\'s SmartShift Technology to provide a dimmable value. With its Auto Frequency feature, it provides an efficient way for the user to dynamically set the current delivered to the LED, thus customizing the brightness of the LED.

The LP8556TME-E05/NOPB has the ability to communicate via I2C, bridging the gap between the driver and the application. This communication link allows for real-time current and voltage feedback to ensure power consumption is kept to a minimum while still providing superior performance. Additionally, the driver features an integrated low battery shut-off feature that can be triggered when the battery voltage drops below a set threshold, preventing the LED string from being overloaded.

The LP8556TME-E05/NOPB application field is broad, including LED lighting applications in automobiles, commercial products, and industrial applications. This low voltage step-up DC-DC LED driver is capable of driving the trending high power LEDs, delivering up to 500ma of continuous current to an LED string, enabling it to be used in a variety of high current applications. It is also well suited for driving general illumination applications in automotive, commercial and industrial settings, where low power dissipation and flexible dimming capabilities are desired.

The working principle of the LP8556TME-E05/NOPB is based on its internal boost converter design, which generates a constant current to suit the load current. The device operates as a closed-loop system, in which the output voltage of the boost converter is regulated against an internally generated reference. When an LED string is connected, the voltage drop across the LED string is sensed by the integrated current sense circuit in the driver. The sensed voltage is then compared to the internally generated reference to adjust the output of the boost converter accordingly, thus maintaining a constant current to the LED string. Additionally, the LP8556TME-E05/NOPB has the ability to accept an external voltage signal, allowing for the LED brightness to be digitally adjusted using a PWM signal.

In conclusion, the LP8556TME-E05/NOPB is a high-efficiency step-up DC-DC LED driver, offering a variety of features such as auto frequency adjustment, adjustable peak current, adjustable onset voltage, adjustable frequency control and low battery shut-off. It provides excellent efficiency, low drop-out voltage and can be used with SmartShift technology for dimmable LED strings. Ideal for automotive, commercial and industrial LED lighting applications, the LP8556TME-E05/NOPB can increase system reliability and life span while taking LED designs to the next level.