Two-channel LED Drivers for High CRI Professional and Consumer Lamps

The new three two-channel solid state lighting (SSL) LED drivers provide accurate color control for two-color LED light engines. In addition, the LED drivers deliver the most efficient power management, with the lowest component count, for high CRI LED lamps.

Ideal for applications including general lighting, residential and commercial lighting, architectural lighting, and mood lighting, LED drivers consist of the AtmelMSL2021,MSL2023,MSL2024; all can be accompanied with an Atmel AVR microcontroller (MCU) or ARM processor-based MCU for a complete system solution in a variety of luminaires and lamp configurations.

The new MSL2021/23/24 LED devices have several distinct advantages when compared to existing LED drivers:

– The devices drive one dominant LED string with a linear controller and one color LED string with a low-side buck controller to achieve the target correlated color temperature (CCT) coordinate, and replicate the color spectrum to attain a high CRI value.

– The devices have a look-up table in the EEPROM so designers can program accurate profiles to follow the desired CCT compensation curve, lowering the overall bill of materials (BOM) cost.

– The linear controller for white LEDs in the device family adaptively controls the headroom of any AC/DC or DC/DC, isolated or non-isolated topology, while external MOSFETs give designers the flexibility of choosing LED currents and LED string lengths.

– There are several dimming options and I2C interface for additional flexibility and control.

Key features for the three new devices include:  

• MSL2021 — the first LED driver with integrated temperature compensation for the color LED string

• MSL2023 — offering I2C serial port and internal pulse-width modulation (PWM) generators

• MSL2024 — featuring individual PWM input pins