TPS61181EVM-259

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LED drivers are electronic circuits designed to regulate the amount of power applied to light-emitting diodes (LEDs). LEDs are driven differently than other electrical loads, and specialized drivers are needed for optimal performance and compatibility. LED drivers come in a variety of forms, from integrated circuits to standalone board assemblies. The Texas Instruments TPS61181EVM-259 is an evaluation system for testing and optimizing LED driver designs using the TPS61181 LED driver IC. This article will discuss the application field and working principle of the TPS61181EVM-259.

Applications

The TPS61181EVM-259 is designed to evaluate the performance characteristics and optimize the design of LED drivers in general, and more specifically the TPS61181 LED driver IC. It offers various combinations of dimmable LED loads, output current ranges and switching frequencies up to 1 MHz. The evaluation board is augmented with Macrosense(TM) analog emulation technology, which enables the designer to analyze different control mechanisms on the dynamic performance of the LED driver. Additionally, the board’s DC-DC buck converter allows precise control of power delivered to the LED load, giving designers the ability to evaluate a wide array of LED applications.

Designers can use the TPS61181EVM-259 to evaluate a number of LED driver applications, including:

• General indoor/outdoor lighting applications
• Smart lighting
• Visible indicator lighting
• Automotive lighting
• Ornamental lighting
• Architectural lighting

Working Principle

The TPS61181EVM-259 is a complete system for evaluating the TPS61181 LED driver IC. The evaluation board is powered from a wide input range of 5.5V to 22V, making it suitable for a variety of different applications. The board also features a step-up/boost converter for supplying the LED load, a current monitoring circuit for measuring average LED current and a dimming control circuit for controlling PWM dimming of the LED load.

The device is based on the principle of pulse-width modulation (PWM) and employs an efficient hysteretic control loop. This hysteretic control loop senses the output voltage to regulate the output current to match the programmed peak load current. The adjustable hysteresis is used to set the operating window of the control loop. By varying the hysteresis level, the peak-to-peak ripple of the current can be adjusted as desired.

The board also features a photodiode (PD) for sensing backlight current levels, which can be used for ambient light sensing (ALS). Options are provided for controlling the output current by adjusting the resistance of the ALS adjustment pins or by using an external voltage source. There are also three buttons provided for manual dimming control.

Conclusion

The Texas Instruments TPS61181EVM-259 Evaluation System is a perfect choice for evaluating and optimizing LED driver designs using the TPS61181 LED driver IC. It offers a wide combination of dimmable LED loads, output current ranges and switching frequencies up to 1 MHz. Additionally, the board’s step-up/boost converter and photodiode sensing circuit allow designers the flexibility to evaluate various LED applications. The TPS61181EVM-259 is an ideal evaluation system for LED driver developers.

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