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LX1688CPW-TR Datasheet(PDF) 1 Page - Microsemi Corporation |
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LX1688CPW-TR Datasheet(HTML) 1 Page - Microsemi Corporation |
1 / 16 page RangeMAX™ LX1688 PRODUCTION DATA SHEET Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 Copyright © 2001 Rev. 1.2, 2006-03-09 Multiple Lamp CCFL Controller TM ® DESCRIPTION The LX1688 is a fixed frequency, dual current/voltage mode, switching regulator that provides the control function for Cold Cathode Fluorescent Lighting (CCFL). This controller can be used to drive a single lamp, but is specifically designed for multiple lamp LCD panels. The IC can be configured as a master or slave and synchronize up to 12 controllers. The LX1688 includes highly integrated universal ‘PWM or DC’ dim input that allows either a PWM or DC input to adjust brightness without requiring external conditioning, since a single external capacitor CPWM can be used to integrate a PWM input. Burst mode dimming is possible if the user supplies a low frequency PWM signal on the BRITE input and no CPWM capacitor is used. The controller utilizes Microsemi’s patented direct drive fixed frequency topology and patented resonant lamp strike generation technique. Safety and reliability features include a 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 conservatively limiting maximum open circuit voltage. In addition the controller features include auto shutdown for an open or broken lamp, and a lamp fault detection with a status reporting output. To improve design flexibility the IC includes the ability to select the polarity of both the chip enable and dim (BRITE) inputs. Also included is a switched VDD output of up to 10mA that will allow the user to power other circuitry that can be switched on and off with the inverters enable input. This preserves the micro power sleep mode with no additional components. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com Protected by U.S. Patents 5,615,093; 5,923,129; 5,930,121; 6,198,234; Patents Pending KEY FEATUR ES Provision to Synchronize Lamp Current & Frequency With Other Controllers Dimming With Analog or Digital (PWM) Methods (>20:1) Programmable Fixed Frequency Adjustable Power-up Reset ENABLE/BRITE Polarity Selection Voltage Limiting on Step-up Transformer Secondary Winding Open Lamp Timeout Circuitry Switched VDD Output (10mA) Micro-Amp Sleep Mode Operates With 3.3V to 5V Supply 100mA Output Drive Capability APPLICATIONS / BENEFITS Desktop LCD Monitors Multiple Lamp Panels Low Ambient Light Displays High Efficiency Lower Cost than Conventional Buck/Royer Inverter Topologies Improved Lamp Strike Capability Improved Over-Voltage Control PRODUCT H I GHLIGHT LX1688 MASTER LX1688 SLAVE FAULT 1 FAULT 2 INPUT CONNECTOR LAMPS DIMMING (BRITE) ENABLE BRITE ENABLE FAULT 1 FAULT 2 VDD STRIKE STATUS STRIKE STATUS Ch2 10.0mV Ω M100µs Ch3 10.0mV Ω 125 Hz 5% Duty cycle Burst 65KHz run frequency Simplified Quad Lamp Inverter Showing Synchronized Output Waveforms PACKAGE ORDER INFO PW Plastic TSSOP 24-Pin TJ (°C) MIN VDD MAX VDD RoHS compliant / Pb-free Transition DC: 0442 0 to 70 3.0V 5.5V LX1688CPW -40 to 85 3.0V 5.5V LX1688IPW Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1688CPW-TR) |
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