2-String LED Driver
Atmel LED Drivers
MSL2023 / MSL2024
2-String LED Driver with Individual PWM Dimming and Adaptive Headroom Control for Hi...
Description
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 ...
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