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LX1688IPW-TR Datasheet(PDF) 6 Page - Microsemi Corporation |
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LX1688IPW-TR Datasheet(HTML) 6 Page - Microsemi Corporation |
6 / 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 6 Copyright © 2001 Rev. 1.2, 2006-03-09 Multiple Lamp CCFL Controller TM ® TABLE 1 Pin BEPOL ENABLE POLARITY DIMMING POLARITY* VDD + (HI = CHIP_ON, LOW = CHIP_OFF CONVENTIONAL FLOAT + (HI = CHIP_ON, LOW = CHIP_OFF) REVERSE VSS - (LOW = CHIP_ON, HI = CHIP_OFF) REVERSE * Conventional polarity means that the lamp brightness increases with increasing voltage on the BRITE pin. Reverse polarity means that brightness decreases with increasing voltage OPERATIONAL MODES Controller Mode Controller Operation Input Pin: OLSNS Input Pin: SLAVE Output Pin: FAULT Pin: RMP_RST Pin: A_SYNC Lamp Frequency Run > 0.6V VSS L Output: FINT Output: FINT / 2 FINT / 2 Striking < 0.2V VSS L Output: FINT Output: FINT / 2 Ramping up / down Master Fault X VSS H Output: FINT Output: FINT / 2 Off Run > 0.6V VDD L Input: FEXT Input: FEXT / 2 FEXT / 2 Striking < 0.2V VDD L Input: FEXT Input: FEXT / 2 Ramping up / down Slave Fault X VDD H Input: FEXT Input: FEXT / 2 Off SIMPLIFIED BLOCK DIAGRAM PHA_SYNC RMP_RST SLAVE ISNS VSNS VCOMP ICOMP PWR_BD FAULT V DD_P A OUT VSS_P PWR_ BD BRITE 100K CPW 1 BEPOL ENABLE VDDSW POLARITY DECODE TTL BUF VSS VDD INTERNAL VDD VSS PWR_GD 6 BIT COUNTER TRI WAVE GEN FAULT OLSNS TTL BUF PWR_ BD 800mV 600mV RAMP RUN GENERATOR OUTPUT STEERING LOGIC PWR_ GD FAULT B OUT 1.25V VDD + - + - 1V 1V ERROR AMP VOLTAGE COMPARATOR CURRENT COMPARATOR Q Q CPW 2 IGNITE FAULT TRI_C 100K 100K 100K 200K 2.5 V + - 0.5 V BRT 0-2V 1M 1M I_R CPOR PWR_BD BIAS GEN UVLO STRIKE GENERATOR TFF Q R T PWR_ GD F INT F EXT/2 F EXT 300mV VAMP IAMP LX1688 Figure – Simplified Block Diagram |
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