Tag Archives: CRI

High-performance lighting with Atmel’s MSL2021/23/24 LED drivers

Atmel’s MSL2021/23/24 series of solid state lighting (SSL) LED drivers are equipped with an adaptive power control scheme and temperature compensation circuitry – offering the most efficient power management for high color-rendering index (CRI) luminaires.

According to an Atmel engineering rep, the MSL2021/23/24 devices drive one dominant LED string and one color LED string to achieve the target correlated color temperature (CCT), replicating the color spectrum and attaining a high CRI value.

“Competitive LED drivers, by contrast, are more expensive and complex to use, requiring an external microcontroller and firmware to address temperature compensation,” the engineering rep explained.

The above-mentioned Atmel series consists of three devices:

MSL2021 – The first LED driver with integrated temperature compensation for the color LED string.

MSL2023 – Equipped with an I2C serial port and internal pulse-width modulation (PWM) generators.

MSL2024 – Features PWM inputs which are suited for development with Atmel’s general-purpose and communications AVR microcontrollers.

Key functions and features include color control of two-color LED light engines, direct control of offline AC/DC controllers, adjustable temperature compensation for controlling color over temperature, as well as PWM and peak current control of each LED string.

Additional key specs include an accurate “white point”adjustment using proprietary temperature compensation scheme; control of single or two-stage power factor correction (PFC) AC/DC or DC/DC supply via efficiency optimizer; initial calibration at factory and storage of system defaults via integrated EEPROM; smooth start-up to avoid “red flash” and comprehensive fault management.

In terms of specific applications, the MSL2021/23/24 LED drivers can be used for general lighting, architectural lighting and mood lighting. Interested in learning more about Atmel’s extensive lighting portfolio? Be sure to check out our main lighting page here which offers a detailed look at various lighting technologies.