LT3755
LT3755-1
LT3755-2
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LT3755
LT3755-1
LT3755-2

40VIN, 75VOUT LED Controllers

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 45
1ku List Price Starting From $3.64
Features
  • 3000:1 True Color PWM Dimming
  • Wide Input Voltage Range: 4.5V to 40V
  • Output Voltage Up to 75V
  • Constant-Current and Constant-Voltage Regulation
  • 100mV High Side Current Sense
  • Drives LEDs in Boost, Buck Mode, Buck-Boost Mode, SEPIC or Flyback Topology
  • Adjustable Frequency: 100kHz to 1MHz
  • Open LED Protection
  • Programmable Undervoltage Lockout with Hysteresis
  • Improved Open LED Status Pin (LT3755-2)
  • Frequency Synchronization (LT3755-1)
  • PWM Disconnect Switch Driver
  • CTRL Pin Provides Analog Dimming
  • Low Shutdown Current: <1µA
  • Programmable Soft-Start
  • Thermally Enhanced 16-Lead QFN (3mm × 3mm) and MSOP Packages
  • AEC-Q100 Qualified For Automotive Applications
Additional Details
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The LT3755, LT3755-1 and LT3755-2 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 7.15V 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.

Applications

  • High Power LED
  • Battery Chargers
  • Accurate Current Limited Voltage Regulators
Part Models 45
1ku List Price Starting From $3.64

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Oct 11, 2022

- 22_0244

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

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UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]

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Jun 21, 2022

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UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

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Software and Part Ecosystem

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Evaluation Kit

Evaluation Kits 2

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DC1268B-B

LT3755EUD-1 Demo Board | Boost LED Driver Controller, 8V ≤ VIN ≤ 40V, VLED up to 54V @ 1A

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DC1268B-B

LT3755EUD-1 Demo Board | Boost LED Driver Controller, 8V ≤ VIN ≤ 40V, VLED up to 54V @ 1A

LT3755EUD-1 Demo Board | Boost LED Driver Controller, 8V ≤ VIN ≤ 40V, VLED up to 54V @ 1A

Product Detail

Demonstration circuit 1268B is a high voltage and high current LED driver controller featuring the multitopology, constant current, constant voltage LT3755-2 (1268B-A) or LT3755-1 (1268B-B). The LT3755-2 features an OPEN LED status pin, while the LT3755-1 allows external frequency synchronization. The demonstration circuit is assembled as a boost topology with an 8V to 40V input voltage range, 1A LED current and up to 54V LED forward voltage.


The DC 1268B features PWM dimming, analog dimming, shutdown, and open LED overvoltage protection. Open circuit LED protection clamps the LED voltage at 56V, though the ICs can provide an output voltage up to 75V.


 



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