CYPRESS SEMICONDUCTOR AN15733 Power Management - RGB Color Mixing Hardware For EZ-Color LED Controllers handbook

About this manual

This application note (AN15733) explains how to drive multiple high‑power LEDs using Cypress EZ‑Color devices such as the CY8CLED16. It covers temperature‑feedback and color‑sensor feedback loops, constant‑current driver topologies, and practical design considerations for the CY3261A‑RGB demonstration board.

The document includes two PSoC Express example projects that demonstrate LED dimming, color mixing with PrISM blocks, and I²C‑controlled tuning. It also provides a brief appendix of photometry units and author contact information.

What's inside

• Abstract
• Introduction
• High Power LED Considerations
• Junction Temperature Feedback
• Color Sensor Feedback
• Constant Current Driver
• LED Control for Color Mixing
• Temperature Measurement
• Appendix A. SI Photometry Units
• About the Author

Specifications

Frequently asked questions

What current does the LM3402 buck converter regulate for the LEDs?

The LM3402 is set to regulate the LED current to 350 mA.

How many LED controllers are on the CY3261A‑RGB board and what is the total current?

The board has three LED controllers providing a total LED current of 1.05 A.

What is the typical forward voltage of each LED on the demonstration board?

Each LED’s forward voltage is about 3.7 V.

Which feedback method provides lower radiated EMI, PWM or SSDM?

The SSDM (Stochastic Signal Density Modulation) method reduces radiated EMI compared with PWM.