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LXM1617-05-42 Datasheet(PDF) 5 Page - Microsemi Corporation |
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LXM1617-05-42 Datasheet(HTML) 5 Page - Microsemi Corporation |
5 / 6 page PRODUCTION DATASHEET Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 Copyright © 2002 Rev. 1.0b, 2005-01-14 PanelMatch™ LXM1617-05-4x 5V 4W CCFL Programmable Inverter Module I N T E GRA T ED PR ODUC T S TY PI CAL APPLI CATI O N LXM1617-05-4x 5V SET 2 GND V HI V LO BRITE V IN1 SLEEP SET 1 0.45V to 2.0V 1.8K 20K DAC or Pot CCFL TUBE NC NC Figure 1 – Brightness Control (output current set to maximum) P.W. 10µs to 125µS BRITE LXM1617-05-4x 0 < P.W. < 100% of period PWM Signal from System Figure 1A – PWM Brightness Control LXM1617-05-4x SET 2 GND V HI V LO SLEEP SET 1 CCFL TUBE BRITE 5V V IN1 L L 5.0mARMS L H 5.5mARMS H L 6.0mARMS H H 6.5mARMS L=GND; H= Open Figure 2 – Max Output Current (SET1 and SET2 Inputs) The brightness control may be a voltage output DAC or other voltage source, a digital pot or 20K manual pot. The inverter contains an internal 10K pull-up to 3V to bias the pot add a 1.8K resistor to set the lower threshold voltage. A 3.3V Logic Level PWM signal from a micro-controller may also be used as shown in Figure 1A. If you need to turn the inverter ON/OFF remotely, connect to TTL logic signal to the SLEEP input. Connect VHI to high voltage wire from the lamp. Connect VLO to the low voltage wire (wire with thinner insulation). Never connect VLO to circuit ground as this will defeat lamp current regulation. If both lamp wires have heavy high voltage insulation, connect the longest wire to VLO. This wire is typically white. Use the SET1 and SET2 (see Figure 2) inputs to select the desired maximum output current. Using these two pins in combination allows the inverter to match a wide variety of panels from different manufactures. Generally the best lamp lifetime correlates with driving the CCFL at the manufactures nominal current setting. However the SET1 and SET2 inputs allow the user the flexibility to adjust the current to the maximum allowable output current to increase panel brightness at the expense of some reduced lamp life. Although the SET pins are designed such that just leaving them open or grounding them is all that is needed to set the output current, they can also be actively set. Using a open collector or open drain logic signal will allow you to reduce the lamp current for situations where greater dim range is required, as an example in nighttime situations. In conjunction with a light sensor or other timer the panel could be set to higher brightness (maximum output current) for daytime illumination and lower brightness (minimum or typical output current) at nighttime. Since the dim ratio is a factor of both the burst duty cycle and the peak output current, using this technique the effective dim ratio can be increased greater than the burst duty cycle alone. Conversely the SET inputs could be used to overdrive the lamp temporarily to facilitate faster lamp warm up at initial lamp turn on. Of course any possible degradation on lamp life from such practices is the users responsibility since not all lamps are designed to be overdriven. The inverter has a built in fault timeout function. If the output is open (lamp disconnected or broken) or shorted the inverter will attempt to strike the lamp for several seconds. After about 2 seconds without success the inverter will shutdown. In order to restart the inverter it is necessary to toggle the sleep input or cycle the VIN1 input supply. |
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