MAX16803EVKIT+

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The MAX16803EVKIT+ is an advanced evaluation tool designed to quickly evaluate the capabilities of the MAX16803, a high-efficiency, high-voltage LED driver with ultra-small footprint solution. It is found in a range of Evaluation Boards that fall under the LED Drivers category. In this article we will explain the application field and working principle of this board.

The MAX16803EVKIT+ is part of the low-voltage and high-voltage, constant current LED drivers suitable for high-power discrete LEDs applications. It carries an operating frequency up to 2 MHz and offers a programmable current control of up to 1.5A. It is designed and optimized to drive a single string of discrete LEDs in series, and can achieve a maximum efficiency of up to 90%. It also features ±20% current accuracy over a wide ambient temperature range, as well as protection from open/short circuits and over-temperature.

The MAX16803EVKIT+ features a highly conservative peak current regulation and a PWM dimming solution, which allows for LED pulsing without affecting LED luminance, making this board applicable in multiple LED-based applications such as LED signs, ambient lighting, automotive applications, decorative lighting, and illumination. Thus, it can be used to control anything from a single LED to multiple strings of LEDs. Most of the evaluation functions have a built-in default configuration, which can be adjusted and tested through the keypad on the board or an optional PC-based GUI.

The MAX16803EVKIT+ adopts a full bridge parallel loads (FBP, also called boost/buck LED driver) architecture. The buck LED driver uses the output current to regulate LED current. The inductor value, or the time constant of the inductor, is calculated by multiplying the input voltage and the inductance, in order to maintain power balance between the buck and boost LED drivers. The MAX16803EVKIT+ also supports a single-stage architecture, which allows for more efficient operation as compared to the two-stage architecture. The input voltage is appropriately regulated by the buck LED driver at both the low and high load.

The MAX16803EVKIT+ also employs an intelligent discharge. This is a feature designed to reduce the peak current load of the output stage by stopping the transfer of power from the buck to the boost LEDs at transition stages, thus avoiding the generation of high ripple components. Additionally, the MAX16803EVKIT+ features an auto-balancing loop, which adjusts the light source to maintain output accuracy. This is important in applications where narrow lines of light are required.

Other features of the MAX16803EVKIT+ include a real-time temperature monitor, which helps in efficient heat dissipation and extends the lifetime of the output stage; current foldback, designed to protect from over current; and a number of integrated protection features, such as open/short LED protection, safety loop and over temperature protection.

Overall, the MAX16803EVKIT+ is a feature packed board that can boost the efficiency of LED based systems, with minimal external components. It provides efficient, constant current LED drivers with a maximum operating frequency up to 2MHz, and includes protection against open/short circuit and over-temperature operation. It is highly suitable for applications such as LED signs, ambient lighting, automotive applications, decorative lighting, and illumination, and can be used to control either a single LED or multiple strings of them.

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