LX1686CPW

LX1686CPW Datasheet

LX1686

Part	Datasheet
LX1686CPW	LX1686CPW (pdf)

PDF Datasheet Preview
INTEGRATED PRODUCTS Not Recommended For New Design LX1686 Digital Dimming CCFL Controller IC PRODUCTION DATA SHEET .COM The LX1686 Backlight Controller Safety and reliability features include IC provides all the control functions a new dual feedback control loop that needed to implement Microsemi’s direct drive inverters used to operate cold cathode fluorescent lamps CCFL’s . This IC can be used to control single or multiple-lamp configurations. CCFL’s are used for back or edge lighting of liquid crystal flat panel displays LCD’s and permits regulation of maximum lamp strike voltage as well as lamp current. Regulating maximum lamp voltage permits the designer to provide for ample worst case lamp strike voltage while at the same time conservatively limit maximum open circuit voltage. An innovative new strike voltage typically find application in notebook computers, web browsers, automotive and industrial instrumentation, and entertainment systems. The LX1686 includes a PWM controlled lamp current burst circuit that can provide a > 100:1 dimming range from a simple zero to 2.5V potentiometer input. The PWM dimming burst rate is easily synchronized to the LCD panel’s frame rate to prevent interference from optical beat frequencies. generation technique enables the nodule designer to optimize high voltage transformer design for maximum operating efficiency with no power dissipating overhead to guarantee strike capability Direct drive topology is a nonresonant, oscillator-controlled PWM regulation method. The LX1686 allows a wide choice of fixed operating frequencies to match lamp current frequency to the lamp’s most efficient operating point, and to minimize high frequency interference. IMPORTANT For the most current data, consult MICROSEMI’s website Protected by U.S. Patents 5,615,093 5,923,129 5,930,121 6,198,234 Patents Pending PRODUCT HIGHLIGHT Standard Analog Dimming Inverter KEY FEATURES RangeMAX Wide Range Dimming >100:1 Synchronizable to Display Video Frequency High Voltage Feedback Loop Directly Controls Maximum Open Lamp Micro-Amp Sleep Mode User Programmable Fixed Frequency Operation Under-Voltage Lockout Feature With Power-Up Reset Built-In Soft-Start Feature Operates With 3.3V or 5V power Supplies 100mA Output Drive Capability Notebooks Instrumentation Display Desktop Computer Monitors Low Ambient Light Displays used in Aircraft, Automobiles, and Hand-Held Equipment Extremely High Efficiency From 3.3V to 5V Power Supplies Lower Cost Than Conventional Buck / Royer Inverter Topologies Improved Lamp Strike Capability Improved Over-Voltage Control Power Used Watts Microsemi's RangeMAX Light emitted by a CCFL is proportional to the current flowing through it. There are two ways to control the current by adjusting the amplitude of a continuous AC current or, as with RangeMAX technology, by varying the amount of time a burst of full current is present. RangeMAX technology frees the backlight inverter module designer to operate in a lower brightness and lower power consumption mode than is possible with conventional amplitude control methods.

PDF Datasheet Preview

INTEGRATED PRODUCTS

Not Recommended For New Design

LX1686

Digital Dimming CCFL Controller IC

PRODUCTION DATA SHEET
.COM

The LX1686 Backlight Controller Safety and reliability features include IC provides all the control functions a new dual feedback control loop that
needed to implement Microsemi’s direct drive inverters used to operate cold cathode fluorescent lamps CCFL’s . This IC can be used to control single or multiple-lamp configurations. CCFL’s are used for back or edge lighting of liquid crystal flat panel displays LCD’s and
permits regulation of maximum lamp strike voltage as well as lamp current. Regulating maximum lamp voltage permits the designer to provide for ample worst case lamp strike voltage while at the same time conservatively limit maximum open circuit voltage.

An innovative new strike voltage
typically find application in notebook computers, web browsers, automotive and industrial instrumentation, and entertainment systems.

The LX1686 includes a PWM controlled lamp current burst circuit that can provide a > 100:1 dimming range from a simple zero to 2.5V potentiometer input. The PWM dimming burst rate is easily synchronized to the LCD panel’s frame rate to prevent interference from optical beat frequencies.
generation technique enables the nodule designer to optimize high voltage transformer design for maximum operating efficiency with no power dissipating overhead to guarantee strike capability

Direct drive topology is a nonresonant, oscillator-controlled PWM regulation method. The LX1686 allows a wide choice of fixed operating frequencies to match lamp current frequency to the lamp’s most efficient operating point, and to minimize high frequency interference.

IMPORTANT For the most current data, consult MICROSEMI’s website Protected by U.S. Patents 5,615,093 5,923,129 5,930,121 6,198,234 Patents Pending

PRODUCT HIGHLIGHT

Standard Analog

Dimming Inverter

KEY FEATURES

RangeMAX Wide Range Dimming >100:1

Synchronizable to Display Video Frequency

High Voltage Feedback Loop Directly Controls Maximum Open Lamp

Micro-Amp Sleep Mode User Programmable Fixed

Frequency Operation Under-Voltage Lockout Feature

With Power-Up Reset Built-In Soft-Start Feature Operates With 3.3V or 5V power

Supplies 100mA Output Drive Capability

Notebooks Instrumentation Display Desktop Computer Monitors Low Ambient Light Displays
used in Aircraft, Automobiles, and Hand-Held Equipment

Extremely High Efficiency From 3.3V to 5V Power Supplies

Lower Cost Than Conventional Buck / Royer Inverter Topologies

Improved Lamp Strike Capability Improved Over-Voltage Control

Power Used Watts

Microsemi's

RangeMAX

Light emitted by a CCFL is proportional to the current flowing through it.

There are two ways to control the current by adjusting the amplitude of a
continuous AC current or, as with RangeMAX technology, by varying the
amount of time a burst of full current is present. RangeMAX technology
frees the backlight inverter module designer to operate in a lower
brightness and lower power consumption mode than is possible with
conventional amplitude control methods.

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Datasheet ID: LX1686CPW 649008