TPS25740AEVM-741

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Introduction: The TPS25740AEVM-741 is a comprehensive evaluation and demonstration board and kit for Texas Instruments\' TPS25740A High-Voltage Linear LED Driver. It is designed to allow users to quickly evaluate and understand the operation of the TPS25740A and incorporates various features, such as a jumper to switch between using an external power supply and the on-board power supply. This evaluation board is also designed to allow users to develop and verify control algorithms according to their own specific system requirements. This application note will focus on the TPS25740AEVM-741 and its application field and working principle.
Evaluation Board Description: The TPS25740AEVM-741 evaluation board contains all the necessary components to evaluate the TPS25740A LED driver. The primary component of the evaluation board is the TPS25740A high-voltage linear LED driver. The evaluation board also includes a voltage regulator, a jumper, two voltage dividers, and a reference voltage. The voltage regulator provides a regulated voltage of up to 48V from an external voltage supply, and the on-board jumper switch allows users to switch between using the on-board voltage regulator or an external voltage supply. The voltage dividers allow users to adjust the input voltage to the TPS25740A, and the reference voltage sets the forward voltage drop of the LED. The evaluation board also includes two test points to measure the input voltage, current, and LED output voltage in order to ensure proper operation of the LED driver.
Application Field: The TPS25740AEVM-741 evaluation board and kit is designed for use with the TPS25740A high-voltage linear LED driver. It is intended for applications such as, but not limited to, commercial LED lighting, electronic signs and displays, and automotive applications. The evaluation board is also suitable for use with the TPS25740A for dimming control and LED light engine design.
Working Principle: The TPS25740A LED driver utilizes linear current regulation to accurately regulate the current through the LED string. This allows for excellent LED control and dynamic range. When the EVM jumper is set to the “External” position, the LED string is supplied its power from an external DC voltage, typically ranging from 10-48V. The TPS25740A can both sink and source current from the LED string, offering reliability and LED system versatility. When the EVM jumper is set to the “On-Board” position, the LED string is supplied power from the on-board voltage regulator, which is adjustable from 10 to 15 V. The output voltage of the voltage regulator is determined by the reference voltage, which is adjustable from 0 to 1.5V. The LED driver also features internal thermal and OVP protection.
Conclusion: The TPS25740AEVM-741 evaluation board and kit is a comprehensive and reliable platform for evaluating and testing the TPS25740A high-voltage linear LED driver. It allows users to quickly evaluate and understand the operation of the TPS25740A, as well as develop and verify control algorithms. The EVM jumper also provides the flexibility to utilize both an external DC voltage supply and the on-board voltage regulator for LED power. The TPS25740A LED driver offers linear current regulation and can both sink and source current for LED string operation. It also features internal thermal and OVP protection.

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