RT8475ZS Integrated Circuits (ICs)

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PMIC - LED Drivers

The RT8475ZS is a high voltage and high current controllable integrated IC for the LED lighting market. It is a multi-channel synchronous boost converter specially designed to meet the needs of mobile flash light, laser projector and other professional lighting product applications. This device is designed to provide a 7V-60V output voltage range and up to 4A of output current, while consuming minimum power.

The idea of using a Buck-Boost topology came from the fact that highly efficient Boost Switching Regulator techniques can be used to increase output voltage in low end applications, while low-end Buck techniques can be used to lower the output voltage in high-end applications. In addition to its obvious advantages, the added boost technique reduces the output ripple, improves load regulation and supports a wide input voltage range of 7V-60V.

The RT8475ZS consists of a low-dropout linear regulator, an NPN driver, an P-channel MOSFET, and a 6-bit digital-to-analog converter. It provides an ideal power supply design solution for powering high-power LED lights, laser projectors, medical lighting and other lighting applications. This device supports several programmable options that allow users to adjust the LED current and brightness depending on the application requirements.

The RT8475ZS also includes a number of features to improve system performance and reduce component count, such as integrated current sensing for over-current protection, adjustable frequency and synchronous rectifier for improved efficiency, and a low-noise reset circuit. The device is also equipped with a built-in high-efficiency PWM dimming control for adjustable brightness control, and can be used with an external reference voltage for further current adjustment for different LED types.

In terms of the RT8475ZS application field, it is suitable for a wide range of LED lighting products, including smart lighting, display systems, laser projector, medical lighting, and mobile flash light applications. This device is capable of providing up to 4A of high current output, ensuring sufficient power supplies for high-powered LED applications.

The working principle of the RT8475ZS is based on the Buck-Boost topology and low-dropout linear regulator approach. The 6-bit resolution of the device’s digital-to-analog converter allows precise current control and over-current protection, while the integrated PWM dimming control allows efficient brightness control with the external reference voltage.

In addition, the additional features of the RT8475ZS, such as the adjustable frequency and synchronous rectifier for improved efficiency, and the low-noise reset circuit, make it an ideal choice for a wide range of LED lighting product applications. Furthermore, the device provides an efficient power supply design solution for high-powered LED lights and laser projectors due to its wide input voltage range and high output current.

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