LT1768 Datasheet | Linear Technology

Features s Ultrawide Multimode Dimming TM Range s Multiple Lamp Capability s Programmable PWM Dimming Range and Frequency s Precision Maximum and Minimum Lamp Currents Maximize Lamp Lifetime s No Lamp Flicker Under All Supply and Load Conditions s Open Lamp Detection and Protection s 350k Hz Switching Frequency s 1.5A MOSFET Gate Driver s 100m V Current Sense Threshold s 5V Reference Voltage Output s The 16-Lead SSOUP Package APPLICATIO S s Desktop Flat Panel Displays s Multiple Lamp Displays s Notebook LCD Displays s Point of Sale Terminal Displays High Power CCFL Controller for Wide Dimming Range and Maximum Lamp Lifetime DESCRIPTIO The LT®1768 is designed to control single or multiple cold cathode fluorescent lamp (CCFL) displays. A unique Multimode Dimming scheme- bines both linear and PWM control functions to maximize lamp life, efficiency, and dimming range. Accurate maximum and minimum lamp currents can be easily set. The LT1768 can detect and protect against lamp failures and overvoltage start-up conditions. It is designed to provide maximum flexibility with a minimum number of external ponents. The LT1768 is a current mode PWM controller with a 1.5A MOSFET driver for high power applications. It contains a 350k Hz oscillator, 5V reference, and a current sense parator with a 100m V threshold. It operates from an 8V to 24V input voltage. The LT1768 also has undervoltage lockout, thermal limit, and a shutdown pin that reduces supply current to 65µA. It is available in a small 16-lead SSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. Multimode Dimming is a trademark of Linear Technology Corporation. - Patent Pending TYPICAL APPLICATIO C4-WIMA MKP2 L1-COILTRONICS UP4-680 T1-2 CTX110607 IN PARALLEL Q1-ZDT1048 - R5 CAN BE METAL PCB TRACE LAMP PGND GATE 33p F LAMP VIN 8V - 24V C1 33µF 33p F T1 4 6 10 C4 0.33µF PROG 0V TO 5V OR 1k Hz PWM C2 0.033µF C3 0.1µF DI02 DI01 VIN VREF SENSE FAULT...