MSL2023

Atmel LED Drivers MSL2023 / MSL2024 2-String LED Driver with Individual PWM Dimming and Adaptive Headroom Control for High CRI LED Luminaires Features  Dual-string LED driver for 2-color or 2 unequal VF LEDs  Phase shifted register controlled dimming (MSL2023)  Individual PWM inputs (MSL2024)  Adaptively controls headroom of AC/DC or DC/DC, isolated or non-isolated topologies  Main LED string driven by linear current controller  Drives external N-channel MOSFET  ± 3% current accuracy, no ripple current  8-bit DAC for peak current control  Color-adjust LED string uses floating buck controller  Drives external N-channel MOSFET  Over 100:1 dimming range  Open and short LED detection  8-bit DAC allows changing current sense threshold  I2C accessible driver settings and EEPROM  Open-drain fault indicator output  -40°C to +105°C operating temperature range Typical Applications  General and architectural lamps  High CRI LED fixtures  Down lights and recessed lights  PAR lamps 42063A–LED–02/2013 1. Introduction The MSL2023/24 LED drivers for two-color systems include a linear current controller for the main string, typically for white LEDs, and a second floating buck controller for a color-adjust LED string. Both the switching and linear controllers drive external MOSFETs to provide flexibility over a wide range of power levels (LED currents and voltages). The MSL2023/24 adaptively manage the voltage powering the main LED string. A proprietary and patent pending ...