LX1744 EVAL KIT Development Boards, Kits, Programmers

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LX1744 is a high performance, wide range, low ripple and low standby current, synchonous rectification, current-mode pulse-width modulation (PWM) controller manufactured by Lite-On. LX1744 is designed for use in constant current buck regulated LED drivers and PC display voltage regulators. In this article, we will discuss the applications and working principle of LX1744 Evaluation Kit.

Applications of LX1744 Evaluation Kit

The LX1744 Evaluation Kit is designed to facilitate the evaluation and development of LED driver applications with constant current regulation that makes use of the LX1744 PWM Controller. The kit includes a reference design for monitoring and controlling the buck current. The board operates from a supply voltage of 6.5 V to 21V and is capable of driving single or multiple strings of LEDs with a constant current up to 1A. The board can also be configured to drive any type of LED product requiring current regulation.

The kit is suitable for LED lighting, LED drivers, and LED power supply applications. It can also be used for automotive, factory automation, and medical applications. The kit comes with eight setting switch pins, three voltage pins, and two current pins, and allows users to quickly adjust their LED driver circuit to meet their desired load and current profiles.

Working Principle of LX1744 Evaluation Kit

The LX1744 Evaluation Kit is based on the LX1744 PWM Controller. The current controller uses a current mode PWM architecture and employs a variable frequency, variable duty cycle method to regulate current in buck mode. The output current of the buck regulator is compared with a reference voltage, and when the two signals are not equal, an error signal is generated, which is amplified and sent to the MOSFET to adjust the on time of the switching cycle. In this way, the LX1744 can regulate the output current accurately.

The LX1744 Evaluation Kit includes an external current sense resistor to sense the current. The resistor feedbacks the output current to the error amplifier, and the LX1744 uses the error signal to control the on time of the MOSFET to regulate the output current. The board operates from a supply voltage of 6.5 V to 21V and is capable of driving single or multiple strings of LEDs with a constant current up to 1A.

The LX1744 Evaluation Kit has a wide input voltage range and can be configured to drive a variety of LED arrays. It also has adjustable voltage and current parameters, which can be set via the on-board header or software. The kit is also designed to provide user-friendly debugging functions, helping users to identify and resolve problems quickly and efficiently. Moreover, the over-current protection, over-voltage protection, and thermal protection features of the LX1744 further ensure the safe operation of the LED driver system.

Conclusion

The LX1744 Evaluation Kit is a useful tool for quickly evaluating the performance of constant current buck regulators and LED driver applications with LX1744 PWM controller. The wide input voltage range and adjustable voltage and current parameters make it easy for users to quickly configure their LED driver circuit and adjust the load and current profiles. Additionally, the various safety features make sure that the LED driver system operates safely and reliably. In conclusion, the LX1744 Evaluation Kit is a valuable tool for evaluating and developing LED driver applications.

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