LX1686EIPW - Microsemi Corporation - Digital Dimming CCFL Controller IC



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 Digital Dimming CCFL Controller IC





The LX1686E Backlight Controller IC provides all the control functions

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 typically find application in notebook computers, web browsers, automotive

and industrial instrumentation, and entertainment systems.

The LX1686E 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.

Safety and reliability features include a new dual feedback control loop that 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 generation technique enables the

module 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 LX1686E 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.





-- 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





part no.



Microsemi Corporation

supply ability





24pin-- TSSOP


new and original stock



Competitive Advantage:


Warranty :180 days !
Free shipping: Order over $1000 win a free shipment fee
(goods weight below 3Kg) ,during 20130901-20130930 .

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