MSL2160 datasheet(4/28 Pages) ATMEL

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Atmel LED Drivers-MSL2160/MSL2161

Atmel LED Drivers-MSL2160/61

Overview

The MSL2160/1 LED string controllers drive, monitor,

and dim multiple LEDs at high efficiency for LCD

backlighting and signage applications. This section

summarizes the capabilities of the MSL2160/1 for

quick evaluation.

How Many LEDs and Drivers?

The MSL2160/1 controls 16 strings of series-

connected LEDs at up to 350mA per string. Up to eight

MSL2160/1s share a serial interface. The maximum

number of LEDs per string is determined by the

maximum power supply voltage, the LED forward

voltage drop (V

F), and the gate drive outputs of the

MSL2160/1. The MSL2160/1 FET gate drive outputs

are optimized for FETs requiring up to 10nC of charge.

LEDs, String Power Supplies

and Efficiency Optimizers (EOs)

The MSL2160/1 Efficiency Optimizer (EO) circuits

dynamically adjust up to three LED string power

supplies to the minimum voltage necessary to

accurately drive the LED strings while assuring accurate

current flow. The power supplies can use any topology,

and are typically DC-DC boost or buck, or AC-DC off-line

switcher supplies.

The MSL2160/1 allows RGB LEDs to be driven by three

separate string supplies, and feature three independent

EO outputs to maximize the efficiency for each supply.

Although not required, it is wise to use this capability

even for single-color systems, such as white backlighting

LEDs in an LCD monitor or TV application.

Timing, PWM, Intensity Controls

and Synchronization

For video applications, the PWM LED drive signals

synchronize to the LCD’s video frame timing via the

PHI input, and to the LCD’s pixel timing via the GSC

input. This synchronization eliminates beating artifacts.

Suitability for LED backlight architectures is shown in

Table 1. Area LED dimming for direct backlighting is

supported for contrast and color gamut improvement.

Motion blur is reduced by setting each LED string’s

PWM phasing individually to synchronize PWM off times

with the LCD timing.

The MSL2160/1 also includes easily controlled internal

PWM timing generation for stand alone (non-video)

LED lighting applications that do not provide external

timing sources. One MSL2160/1 simply generates

PWM timing for itself and for the other devices in a

multiple-device application. Optionally, a single external

PWM signal applied to the PWM input controls all of

the strings’ on times, with automatic progressive phase

delay available through a single control bit.

BACKLIGHT TYPE

MOTION BLUR REMOVAL

AREA DIMMING MANAGEMENT

STRING SUPPLY

OPTIONS

White LED - bottom edge-lit

Up to three efficiency

optimized power supplies

White LED - top/bottom edge-lit No

White LED - four sides edge-lit

White LED - direct back-lit

Yes, LED string phasing

Higher contrast ratio (area dimming)

RGB LED - direct back-lit

Yes, LED string phasing

Higher contrast ratio and color gamut Three efficiency optimized

power supplies

Table 1. LED Common Backlight Drive Architectures and Features

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