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LT3755IMSE-1-PBF Datasheet(PDF) 1 Page - Linear Technology |
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LT3755IMSE-1-PBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page LT3755/LT3755-1 1 37551fa TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION 40VIN, 75VOUT LED Controller The LT ®3755 and LT3755-1 are DC/DC controllers designed to operate as a constant-current source for driving high current LEDs. They drive a low side external N-channel power MOSFET from an internal regulated 7V 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 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. Both parts are available in the 16-lead (3mm × 3mm) QFN and MSOP packages. 50W White Automotive LED Headlamp Driver n 3000:1 True Color PWM TM 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 Open LED Status Pin (LT3755) 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 Applications n Industrial n Automotive VIN LT3755 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 400kHz 4.7μF 40.2k CTRL 0.015Ω 0.1Ω 1M 23.7k 1A 4.7μF 50W LED STRING 37551 TA01a OPENLED PWM SS RT ISN GATE SENSE PWMOUT 10k D2 Efficiency vs VIN VIN (V) 010 80 84 88 92 96 100 20 30 40 37551 TA01b L, LT, LTC and LTM 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. |
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