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LXMG1621-xx Datasheet(PDF) 7 Page - Microsemi Corporation |
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LXMG1621-xx Datasheet(HTML) 7 Page - Microsemi Corporation |
7 / 10 page Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 Copyright © 2007 Rev. 1.2, 2010-08-20 RangeMAX ™ LXMG1621-xx DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE PRODUCTION DATA SHEET TM ® HOW THE RANGEMAX WORK S LAMP VOLTAGE & LAMP CURRENT – BURST MODE OPERATION Figure 3 – 50% Burst Duty Cycle Figure 4 – 2% Burst Duty Cycle Rather than using the traditional dimming technique of varying lamp current magnitude to adjust light output, RangeMAX inverters use a fixed lamp current value with a duty cycle control method. The lamp current burst width can be modulated from 100% (continuous lamp current) down to a 2% duty cycle, allowing the lamp to be dimmed to less than 1% of its full brightness. As can be seen in Trace 3 of Figure 5 photo at right, careful design consideration was given to controlling lamp start voltage to softly start current flow. This eliminates current overshoot that can result in premature cathode wear and reduce lamp life. Figure 5 – 2% Burst Duty Cycle (Expanded Time Base) Ramp Gen. Transformer Driver High Voltage Transformer Comparator Ramp + - I SENSE V SENSE V BRITE 0.25 - 2.2V DC V SYNC V LO V HI V LO V HI Figure 6 – RangeMAX Simplified Block Diagram HIGHLIGHTS • Integrated brightness control circuit includes a DC voltage to pulse width converter that minimizes system design work and system noise susceptibility. This provides a familiar and convenient interface while reducing the potential for externally induced noise, which can cause lamp flicker. • An on-board oscillator operates the inverter BURST rate about 95Hz, well beyond standard 50/60Hz video refresh rates where the eye can perceive pulsing light. • RangeMAX inverter modules are designed to operate with the burst frequency synchronized to the video frame rate. This provides operation with no visible display disturbances caused by beat frequencies between the lamps and video frame rates. |
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