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Texas Instruments LM3409
100-W, High-Resolution, 16-bit Color-Tunable, 0.15% Dimmable RGBW LED Luminaire Reference Design
Overview
| Topology | Buck Converter |
| Input voltage | 28-42 V |
| IC revision | E1 |
Description
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
Typical applications
- Indoor Lighting / Stage Lighting
- LED Power Supply
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Product series | C | Tol. C | VR (V (DC)) | Size | Operating Temperature | Q (%) | DF (%) | RISO | Ceramic Type | L (mm) | W (mm) | H (mm) | Fl (mm) | Packaging | L (µH) | IR (mA) | ISAT (A) | fres (MHz) | Mount | Version | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR 2 (mA) | RDC max. (Ω) | Type | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 885012005056 | SPEC | 8 files | WCAP-CSGP MLCCs 50 V(DC) | 15 pF | ±5% | 50 | 0402 | -55 °C up to +125 °C | 700 | – | 10 GΩ | NP0 Class I | 1 | 0.5 | 0.5 | 0.25 | 7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | ||
| 885012207092 | SPEC | 8 files | WCAP-CSGP MLCCs 50 V(DC) | 10 nF | ±10% | 50 | 0805 | -55 °C up to +125 °C | – | 2.5 | 10 GΩ | X7R Class II | 2 | 1.25 | 0.8 | 0.5 | 7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | ||
 | 742792662 | SPEC | 9 files | WE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | 0603 | -55 °C up to +125 °C | – | – | – | – | 1.6 | 0.8 | 0.8 | 0.3 | – | – | 600 | – | – | SMT | SMT | 1000 | 1050 | 120 MHz | 830 | 0.3 | Wide Band | ||
 | 744053150 | SPEC | 8 files | WE-TPC SMT Tiny Power Inductor | – | – | – | 5828 | -40 °C up to +125 °C | – | – | – | – | 5.8 | 5.8 | 2.8 | – | – | 15 | 1380 | 1.15 | 20 | SMT | SMT | – | – | – | – | 0.1 | – | ||
 | 744770147 | SPEC | 8 files | WE-PD SMT Power Inductor | – | – | – | 1280 | -40 °C up to +125 °C | – | – | – | – | 12 | 12 | 8 | – | – | 47 | 3000 | 3.3 | – | – | Standard | – | – | – | – | 0.064 | – |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 885012005056 | SPEC | |
| 885012207092 | SPEC | |
| 742792662 | SPEC | |
| 744053150 | SPEC | |
| 744770147 | SPEC |
| Samples |
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| Order Code | Datasheet | Simulation | Downloads | Product series | C | Tol. C | VR (V (DC)) | Size | Operating Temperature | Q (%) | DF (%) | RISO | Ceramic Type | L (mm) | W (mm) | H (mm) | Fl (mm) | Packaging | L (µH) | IR (mA) | ISAT (A) | fres (MHz) | Mount | Version | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR 2 (mA) | RDC max. (Ω) | Type | Samples |
|---|