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Reference Designs

100-W: High-Resolution: 16-bit Color-Tunable: 0.15% Dimmable RGBW LED Luminaire Reference Design

Texas Instruments

This reference design demonstrates the finest range of color control of individual RGBW LED strings with > 16 bits of PWM resolution while supporting the PWM modulation frequencies as high as 30 and 50 kHz. This reference design demonstrates the finest range of individual RGBW LED strings color control and enables development of highly efficient DC-DC LED luminaires capable of wide color gamut generation with trillions of colors while at the same time being imperceptible to high-end cameras and video broadcast equipment.

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Features

Four buck current controllers driving RGBW LED strings at 30V and string current of up to 0.75A (also tested up to 1.25A)LED buck current controllers efficiency exceeding 96% at full load with maximum operating frequency up-to 600 kHz100% to 0.2% Contrast setting for PWM dimming method at 30 and 50 kHz100% to 0.15% Contrast setting and better Linearity for Shunt dimming mode at 30 and 50 kHzHigh-resolution PWM feature of C2000™ with 180-ps step enables current adjustment with resolution > 16 bits for both PWM and Shunt FET methods even at 50kHz dimming frequency4Ch: 12bit DAC used for IADJ setting of individual LED strings to enable analog dimming