TLC5951TDA2

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PMIC (Power Management Integrated Circuit) are specialized chips devoted to manage the power supply of electronic components which are usually derived from unregulated sources or complex systems that require precise regulation. LED (Light Emitting Diode) drivers are part of the PMIC family. They are used to control the power supply for LED lighting systems. TLC5951TDA2 is a high-performance LED driver from Texas Instruments. It is designed for applications of small- to medium-size LED backlight control, as well as general LED lighting systems. This article provides an overview of the TLC5951TDA2’s application fields and working principle.

Application Fields

TLC5951TDA2 is a multifunctional LED driver which can be used in a wide range of applications including white-balanced LED backlighting, high power strobe lighting, industrial lighting and general LED lighting applications. It is suitable for use in medium to large LCD displays, point-of-sale systems and notebook PC backlighting, as well as in high-end digital level displays.

The TLC5951TDA2 incorporates various circuitries such as eight channel current regulated source drivers, an internal oscillator, pulse-width modulation (PWM) dimming control, gamma adjustment, and output logic control. It is designed for applications of up to 10A per output current, allowing the TLC5951TDA2 to be used for the control of large LED array with up to 8mm2 chip size. These features enable the TLC5951TDA2 to bring to life a wide range of medium to large display applications that require premium performance.

Working Principle

The TLC5951TDA2 combines three unique circuit blocks: LED driver, PWM dimming controller, and LED current regulation. It uses external voltage-regulating reference voltage (VREF) setting resistor and output current regulatory element (EMR) to provide high accuracy LED current controlling functions.

Firstly, the voltage-regulating reference voltage sets the output current to the potentiometer. Thus, when the reference current is changed the output current will follow this change. Secondly, the output current is regulated by the EMR, ensuring the LED driver gets stable and accurate LED current operation. The use of EMR simplifies LED current control, as it eliminates the need for complicated LED current setting. Lastly, the PWM dimming controller controls the LED driver to achieve PWM dimming. This enables various brightness level setting according to the application requirements.

In addition to this, the TLC5951TDA2 also offers protection against out-of-range input and output voltages. It is internally set up for 12V and 24V output operation, and can optionally be configured for 5V to 28V output applications. It also incorporates low power down mode operation and standby mode operation.

Conclusion

The TLC5951TDA2 is a versatile and high performance LED driver which is designed for application of medium to large display. It incorporates several circuit blocks, such as eight channel current regulated source drivers, an internal oscillator, pulse-width modulation (PWM) dimming control and gamma adjustment, for highly efficient LED current control and for extremely accurate PWM dimming. It also offers protection against out-of-range input and output voltage, and can be configured for a wide range of output operation, making this LED driver an ideal choice for varying LED lighting applications.

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