RT8497GS Integrated Circuits (ICs)

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PMICs - LED Drivers are electric circuits commonly used to provide the power necessary for light emitting diodes (LEDs). The RT8497GS belongs to this category and is utilized in various applications. This paper aims to present the field of applications and working principle of the RT8497GS.

The multifunctional RT8497GS is a single-string current-mode constant voltage/constant current (CV/CC) LED driver controller. It is designed to deliver the output current up to 100mA and output voltage up to 36V with a maximum accuracy of ±3%. The device helps in improving the light efficacy, system cost and reliability of LED drive systems. With features like adjustable output current slew rate, the device also helps in reducing the current ripple.

The RT8497GS is mainly used for indoor lighting applications such as downlight, ceiling light, panel light, T8, cupboad light, spot light and lighting signage, etc. It is also suited for industrial equipment, representative lighting, and architectural lighting. In addition, it can be used to drive a variety of LED strips, such as those commonly found in automotive applications.

The advantages of the RT8497GS include fast conversion speed, excellent temperature stability, and fewer external components. The device also boasts a low start-up voltage as well as wide dimming range that can be adapted to every LED lighting need. The RT8497GS features an internal compensation voltage and unity switch. The switch signal and the constant voltage output can be adjusted by the dimming signal and the dimming resistor, providing users with ample options to adjust their LED lighting.

In terms of working principle, the RT8497GS is operated in high-side and low-side current-mode PWM control mode and double line. The high-side current mode PWM control mode uses a constant off-time method for dimming, while the low-side current mode PWM control mode uses a constant on-time method. The double-line control mode uses both constant on-time and constant off-time methods while drawing the dimming time function. The driver\'s output voltage level is controlled by an internal voltage reference, while the current is set by an external RAMP pin voltage.

The RT8497GS also features an over-temperature protection, short circuit protection, and open-loop protection functions. The adaptive on-time scheme, frequency jittering, and built-in dead time feature, makes the device very suitable for LED lightning applications without generating the audible noise. In addition, the device is also capable of reliability, protecting LED strings over a wide range of input voltage and operating temperature.

In conclusion, the RT8497GS is a multifunctional LED driver controller that is a perfect solution for various LED lighting needs. Featuring low component count and an adjustable output current slew rate, the device is suitable for a variety of indoor and outdoor applications. Thanks to its wide dimming range, fast conversion speed, and temperature stability, it helps reduce the current ripple and power consumption as well. All of these features make the RT8497GS desirable for LED drive system builders seeking a reliable LED controller.

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