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LED driver ICs for high-CRI color-mix SSL applications

LED driver ICs for high-CRI color-mix SSL applications


LED driver ICs that can independently power two LED channels, enabling lamps and luminaires that deliver both high-CRI, warm-white light, and high efficacy.


The use of two-channel driver electronics is a requisite in a color-mixed white SSL products. The white and red or amber LEDs have different forward voltage characteristics. Moreover, more white than color LEDs are generally needed. And the driver has to adjust the relative drive currents during dimming to achieve an incandescent-like, dim-to-warm-CCT experience.

In many cases today, SSL product developers must utilize two separate driver ICs to implement color-mixed designs.

The ICs include a linear controller used to drive a primary channel of white LEDs and a buck controller designed to drive a color LED string. The IC requires external MOSFETs. Atmel made the decision not to integrate MOSFETs to provide product developers freedom in supporting a range of string voltages.

Thermal feedback can be used in a similar manner because the LED manufacturers provide LM-80 data with accurate projections of LED performance relative to temperature. the temperature compensation offers performance "very close to the optical feedback." The MSL2021 stores color compensation data in an integrated non-volatile memory array.

The other ICs in the family include the MSL2023 and MSL2024, which are optimized for usage with a companion microcontroller that would perform the color-LED compensation. The MSL2023 includes an I2C serial interface to connect with a microcontroller and internal pulse-width-modulation (PWM) generators. The MSL2024 accepts PWM inputs from a microcontroller.

If power-factor correction (PFC) is required in an SSL design, driver designers will need to add one-or two-stage PFC ICs in front of the new driver ICs. The ICs can operate in isolated or non-isolated driver designs.

The kit includes an LED light engine with an appropriate heat sink. And the circuit board includes an AVR microcontroller. Development teams can use the kit to instantly begin prototyping work.



Light up your design with HTlights LED Driver ICs


Extensive LED driver IC product portfolio, design tools, and technical resources can help you add innovative lighting features to your design.

Your driver is the heart and soul of your LED lighting system. That's why it's so important to choose LED Drivers. Powered by Sanlibang technology, our drivers are efficient, intelligent and programmable, allowing you to create innovative, next-generation lighting systems that live up to your high-performance standards. For your next application, trust Sanlibang LED drivers to provide user satisfaction, as well as superior ROI through quality construction and reliable performance.




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