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LT3755-2 Datasheet(PDF) 1 Page - Linear Technology |
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LT3755-2 Datasheet(HTML) 1 Page - Linear Technology |
1 / 26 page LT3755/LT3755-1/LT3755-2 37551fd Typical applicaTion FeaTures applicaTions DescripTion 40VIN, 75VOUT LED Controllers The LT®3755, LT3755-1 and LT3755-2 are DC/DC control- lers designed to operate as a constant-current source for driving high current LEDs. They drive a low side external N-channelpowerMOSFETfromaninternalregulated7.15V supply. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. A ground referenced voltage FB pin serves as the input for several LED protection features, and also makes it possible for the converter to operate as a constant-voltage source. A frequency adjust pin allows the user to program the frequency from 100kHz to 1MHz to optimize efficiency, performance or external component size. The LT3755/LT3755-1/LT3755-2 sense output current at the high side of the LED string. High side current sensing is the most flexible scheme for driving LEDs, allowing boost, buck mode or buck-boost mode configuration. The PWM input provides LED dimming ratios of up to 3000:1, and the CTRL input provides additional analog dimming capability. L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 7199560, 7321203. 50W White Automotive LED Headlamp Driver n 3000:1 True Color PWM™ Dimming n Wide Input Voltage Range: 4.5V to 40V n Output Voltage Up to 75V n Constant-Current and Constant-Voltage Regulation n 100mV High Side Current Sense n Drives LEDs in Boost, Buck Mode, Buck-Boost Mode, SEPIC or Flyback Topology n Adjustable Frequency: 100kHz to 1MHz n Open LED Protection n Programmable Undervoltage Lockout with Hysteresis n Improved Open LED Status Pin (LT3755-2) n Frequency Synchronization (LT3755-1) n PWM Disconnect Switch Driver n CTRL Pin Provides Analog Dimming n Low Shutdown Current: <1µA n Programmable Soft-Start n Thermally Enhanced 16-Lead QFN (3mm × 3mm) and MSOP Packages n High Power LED n Battery Chargers n Accurate Current Limited Voltage Regulators VIN LT3755-2 22µH GND VC INTVCC SHDN/UVLO FB VREF ISP 332k 100k INTVCC 1M 4.7µF 0.001µF 0.01µF VIN 8V TO 40V 185k 10k 28.7k 375kHz 4.7µF 40.2k CTRL 0.015 0.1 1M 23.7k 1A 4.7µF 50W LED STRING 37551 TA01a OPENLED PWM SS RT ISN GATE SENSE PWMOUT Efficiency vs VIN VIN (V) 0 10 80 84 88 92 96 100 20 30 40 37551 TA01b |
Similar Part No. - LT3755-2_15 |
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Similar Description - LT3755-2_15 |
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