LP8556TMX-E09/NOPB

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Power management integrated circuits (PMICs) are widely used in various product applications to control power flow and system performance. PMICs range from single-chip solutions to multiple-chip solutions that provide a complete power management system. One of the most popular PMICs technologies is LED drivers, which are used to drive and control light emitting diode (LED) lighting. The LP8556TMX-E09/NOPB is an LED driver from Texas Instruments that can drive multiple strings of LEDs for backlighting and general lighting applications.

Overview of LP8556TMX-E09/NOPB

The LP8556TMX-E09/NOPB is a high-efficiency, high-power LED driver IC with integrated charge pump and dimming circuitry. It integrates two high-performance boost converters with two strings of N-Channel MOSFETs and two separate current sources, allowing for the control of up to two channels of LEDs independently. It also features an adjustable AC current limit, an adjustable peak current limit, and an adjustable brightness control. The IC offers a very low dropout voltage, making it suitable for low input voltage applications.

Application Field of LP8556TMX-E09/NOPB

The LP8556TMX-E09/NOPB is suitable for a wide range of LED backlighting and general lighting applications. Its high efficiency, adjustable peak current limit, and adjustable brightness control make it ideal for applications such as LCD televisions, LCD monitors, LED lighting, and automotive lighting. In particular, the IC can achieve up to 99% efficiency, which makes it an ideal choice for applications that require high efficiency and low power consumption.

Working Principle of LP8556TMX-E09/NOPB

The LP8556TMX-E09/NOPB uses two boost converters to drive two independent strings of LEDs. The operating current of each LED string is set by two individual current sources. The two strings of LEDs can be adjusted independently with separate brightness control and dimming control. The adjustable AC current limit allows precise control of the total LED current, while the adjustable peak current limit helps protect the LEDs from high peak current damage.

The dimming control is achieved by using a pulse width modulation (PWM) signal or analog dimming signal to adjust the LED string current. The alternate control method uses a slave control with the majority of the control logic from the on-board charge pump. The charge pump allows the LED string current to be adjusted over a wide range, allowing for better dimming control and more efficient power conversion.

Conclusion

The LP8556TMX-E09/NOPB is a high-efficiency, high-power LED driver IC that is ideal for backlighting and general lighting applications. It integrates two high-performance boost converters with two strings of N-Channel MOSFETs and two separate current sources, allowing for the control of up to two channels of LEDs independently. It also features an adjustable AC current limit, an adjustable peak current limit, and an adjustable brightness control. Its high efficiency, adjustable peak current limit, and adjustable brightness control make it ideal for applications such as LCD televisions, LCD monitors, LED lighting, and automotive lighting.

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