100-W, high-resolution, 16-bit color-tunable, 0.15% dimmable RGBW LED luminaire reference design

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.

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 kHz
• 100% to 0.2% Contrast setting for PWM dimming method at 30 and 50 kHz
• 100% to 0.15% Contrast setting and better Linearity for Shunt dimming mode at 30 and 50 kHz
• High-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 frequency
• 4Ch, 12bit DAC used for IADJ setting of individual LED strings to enable analog dimming

Parts Include:

CSD19538Q2       100V, 49mOhm SON2x2 NexFET Power MOSFET 

DAC7564             12-Bit, Quad Channel, Ultra-Low Glitch, Voltage Output DAC with 2.5V, 2ppm/°C Internal Reference 

LM3409                PFET Buck Controller for High Power LED Drives 

LM5165                3V-65V, 150mA Synchronous Buck Converter With Ultra-Low IQ 

LMR16006            SIMPLE SWITCHER® 4V to 60V, 600mA Step-Down Regulator with Low Iq 

LP5907                 250mA Ultralow-Noise Low-IQ LDO 

TMS320F28027    Piccolo Microcontroller 

UCC27511           4A/8A Single Channel High-speed Low-side Gate Driver 

Learn more by downloading the reference design below