RT8471ZSP Integrated Circuits (ICs)

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RT8471ZSP Application Field and Working Principle

The RT8471ZSP LED driver is a high efficiency LED driver with integrated high voltage power MOSFETs and high-side linear current sense resistor. It is designed for low power LED lighting applications such as smartphone display backlight and TV LED backlight, providing current domain (current mode) or voltage domain (constant voltage mode) LED driver solutions. This LED driver IC provides complex dimming functions, output short-circuit protection, and supports 1ch/2ch driving modes, making it suitable for a wide range of LED applications.

Application Field

The RT8471ZSP can be widely used in various LED applications such as mobile phone display backlight, TV LED backlight, LCD backlight, small area lighting and decorative lamp. The high efficiency and precise dimming make it very suitable for those applications. In mobile phones, constant voltage mode is preferred for backlight, because it can reduce current ripple, provides brighter backlight, and increases battery life.

Working Principle

The RT8471ZSP is a constant-voltage LED driver IC, with both current domain (current mode) and voltage domain (constant voltage mode) input driver control modes. In constant voltage mode, the LED current is limited by measuring the voltage of the current sense resistor. This LED driver can be operated in both 1-channel and 2-channel driving modes. In 1-channel mode, only one LED is connected to the driver; in 2-channel mode, two LED chips are connected in parallel and wired to the same LED driver. The maximum output current is no more than 1A.

The RT8471ZSP provides sophisticated dimming functions, including flicker free dimming, dim-to-white dimming, PWM dimming, DC dimming and analog dimming. In flicker free dimming the LED brightness is adjusted by adjusting the current; in dim-to-white dimming, the LED brightness is adjusted by modifying the LED current and LED forward voltage; in PWM dimming, dimming is achieved by using a PWM signal; in DC dimming, the LED brightness is adjusted by adjusting the LED output current; and in analog dimming, the LED brightness is adjusted by controlling the LED output current with an analog voltage.

The RT8471ZSP also provides various safety protections for the LED, including output short-circuit protection and over temperature protection. When internal overheating or overvoltage occurs, the chip will automatically shut down and prevent possible damage to the system.

Conclusion

The RT8471ZSP is a high efficiency LED driver, suitable for various LED applications, such as mobile phones, TVs, LCD display backlight, small area lighting and decorative lamps. This LED driver can be operated in either current domain (current mode) or voltage domain (constant voltage mode). It provides various safety protections and sophisticated dimming functions, making it suitable for any LED lighting need.

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