TLC5945RHBR

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Introduction: The TLC5945RHBR is a high performance pulse width modulation (PWM) LED driver integrated circuit (IC) developed by Texas Instruments. It is a single-chip solution that confers remarkable high-speed PWM control and intelligent dimming of up to 4 pairs of strings of RGB or White LEDs. Additionally, it comes with a slew servo that minimizes current overshoots and extraneous noise. The TLC5945RHBR is available in various package types and is suitable for a vast range of applications related to LED drive and illumination.

PMIC - LED Drivers: LED Drivers are integrated circuits used in LED-based lighting systems to convert a AC or DC input power source into the current and voltages specific for the individual LED components. LED drivers include DC-DC boost, buck, constant current sources, and other controllers that dynamically control the LED light intensity and color. LED drivers are required to perform several tasks such as regulating the light output, providing tight current matches in comparison with other LEDs in the same circuit, operating on a range of input voltages and ensuring robust protection against short circuits and overvoltages. The TLC5945RHBR is a high-performance PWM LED driver integrated circuit (IC) that provides efficient, cost-effective and highly versatile LED drive applications.

Application Field: The TLC5945RHBR is designed to meet the needs of demanding white, RGB and RGBW applications. It is the ideal choice for numeorus lighting projects, including outdoor and indoor lighting, car headlights, AUV lighting, emergency lighting, stage lighting, LED sign board backlighting, LED street lamps and LED light boxes.

The TLC5945RHBR is a robust solution that can operate with excellent accuracy and low noise even in electrically noisy conditions. It drives up to four LED strings with optional slew rate servo, spreading over two-step currents up to two channels of 24 LEDs per channel. Furthermore, the TLC5945RHBR features dimming control, low EMI and thermal shutdown protection.

Working Principle: The TLC5945RHBR has an on-chip 64-bit shift register and a 16-bit outgoing multiplier, which allow it to generate extremely accurate PWM outputs from a predefined program. It accepts up to four digital inputs and provides N-Slew, for controlling the transition between states and programs. At the beginning of an output cycle, the TLC5945RHBR shifts in the predetermined data on its DI pin and stores it to a 64-bit shift register. The data is then multiplied by the incoming Multiplier signal while the output clock is set equal to the input clock times the multiplier signal.The TLC5945RHBR also features a slew rate servo, which is an adjustable current source optimized to reduce current overshoots and extraneous noise. The servo adjusts transition times between programmed PWM states and dampens sudden signal changes thereby eliminating transients and providing an overall smoother signal. This feature allows the TLC5945RHBR to drive LEDs accurately and reliably in the most hostile environments.

Conclusion: The TLC5945RHBR is a highly accurate, high-performance PWM LED driver IC from Texas Instruments, providing efficient, cost-effective and highly versatile LED drive applications. It is ideal for LED lighting projects, including outdoor and indoor lighting, car headlights, AUV lighting, emergency lighting, stage lighting, LED sign board backlighting, LED street lamps and LED light boxes. With its 64-bit shift register, 16-bit outgoing multiplier and slew rate servo, the TLC5945RHBR offers fast and reliable LED drive with tight current and voltage matches and low EMI for outstanding performance.

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