EVB_RT8494GS

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The EVB_RT8494GS is an evaluation board of LED drivers developed by Richtek Technology Corporation. It offers developers a platform to evaluate the performance of the RT8494GS, a multiple switching frequency buck controller IC that can provide a wide range of output currents. The IC is configured to work in an open-drain mode, allowing it to operate efficiently with lighting fixtures that use multiple LED configurations and have a wide variety of forward voltages.

The RT8494GS is a multi-level synchronous buck controller IC capable of providing output currents up to 2A in single LED operation. The IC features a wide input voltage range from 2.7V to 75V and a switching frequency range from 200kHz to 2MHz. It has two power stages for either single-ended or differential LED drive configuration. The RT8494GS supports dimming with PWM and other control signals, such as Analog Dimming (RAMP) and Linear Dimming (Brightness Regulator). The IC employs an external sense resistor to ensure accurate current regulation for lighting applications that require high efficiency and low thermal dissipation.

The EVB_RT8494GS evaluation board comes with a selection of output current trimmers and input voltage as well as ground sense compact resistors. The board is fitted with a circulating fan to ensure adequate cooling of the IC during operation. It includes all the necessary components to program the IC, such as a 40-pin socket, crystal oscillator, and power switch. The board includes provisions for testing shutdown, dimming, and peak current limit features of the RT8494GS IC. The user can easily program the different parameters of the IC by using the control and programming switches.

The EVB_RT8494GS evaluation board uses Richtek\'s low-power switching design technique to minimize board size and optimize driver efficiency. The RT8494GS IC internally generates two main power transistors, which are externally connected to an output inductor, an output capacitor, and a load. The AC voltage signal from the load is sensed by the internal current loop, which regulates the current output, ultimately providing the desired output current. The IC also employs a Programmable Linear Regulator to generate the Vcc supply for the IC, thus reducing the overall power dissipation.

The EVB_RT8494GS evaluation board is ideal for design engineers and system integrators who require a flexible and robust LED driver board for their lighting applications. The board is an ideal platform to evaluate the performance of the RT8494GS IC such as switching frequency, input voltage, output current, dimming, and peak current limit features. With the help of the user-friendly form-factor, the board provides an ideal platform for the designers to test the IC without investing in an expensive development cycle.

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