LT3761
LT3761-1

PRODUCTION

60VIN LED Controller with Internal PWM Generator

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Overview

  • 3000:1 True Color PWM™ Dimming for LEDs
  • Wide VIN Range: 4.5V to 60V
  • Rail-to-Rail Current Sense Range: 0V to 80V
  • Programmable PWM Dimming Signal Generator
  • Constant Current (±3%) and Constant-Voltage (±2%) Regulation
  • Analog Dimming
  • Drives LEDs in Boost, SEPIC, Inverting, Buck Mode, Buck-Boost Mode, or Flyback Configuration
  • Output Short-Circuit Protected Boost
  • Open LED Protection
  • Adjustable Switching Frequency: 100kHz to 1MHz
  • Programmable VIN UVLO with Hysteresis
  • C/10 Indication for Battery Chargers
  • Low Shutdown Current: <1μA
  • Thermally Enhanced 16-Lead MSOP Package
  • Open LED Status Pin (LT3761)
  • Frequency Synchronization (LT3761-1)

The LT3761/LT3761-1 is a DC/DC controller designed to operate as a constant-current source and constant-voltage regulator. It features a programmable internal PWM dimming signal. The LT3761/LT3761-1 is ideally suited for driving high current LEDs, but also has features to make it suitable for charging batteries and supercapacitors. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. A voltage feedback 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 LT3761-1 can be synchronized to an external clock. The LT3761/LT3761-1 senses output current at the high side or at the low side of the load. The PWM input can be configured to self-oscillate at fixed frequency with duty ratio programmable from 4% to 96%. When driven by an external signal, the PWM input provides LED dimming ratios of up to 3000:1. The CTRL input provides additional analog dimming capability.

The LT3761/LT3761-1 senses output current at the high side or at the low side of the load. The PWM input can be configured to self-oscillate at fixed frequency with duty ratio programmable from 4% to 96%. When driven by an external signal, the PWM input provides LED dimming ratios of up to 3000:1. The CTRL input provides additional analog dimming capability.

NOTES
LT3761A Higher PWM Dimming Accuracy at Lower LED Current Levels
LT3761-1 Frequency Synchronization
LT3761 Open LED Status Pin


Applications

  • High Voltage LED Strings >100V with Ground Referred Current Sense
  • Grounded Anode LEDs
  • Accurate Current Limited Voltage Regulators
LT3761
LT3761-1
60VIN LED Controller with Internal PWM Generator
94% Efficient Boost LED Driver for Automotive Headlamp with 25:1 Internal PWM Dimming PWM Dimming Waveforms at Various DIM Voltage Settings Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Digital to Analog Converters (DACs) 1
LTC2645
PRODUCTION Quad 12-/10-/8-Bit PWM to VOUT DACs with 10ppm/°C Reference
Protection Switches & Controllers 1
LTC4364
RECOMMENDED FOR NEW DESIGNS Surge Stopper with Ideal Diode
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3761
  • LT3761A
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LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

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DC1772A

LT3761EMSE Demo Board I Boost LED Controller, Internal PWM Dimming, 8V to 60VIN, VOUT up to 60V

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Product Details

DC1772A is a high voltage LED controller with internal PWM dimming. It generates its own PWMOUT waveform for accurate PWM dimming with up to 25:1 brightness ratio. It accepts an input voltage from 8V to 60V (8V UVLO and 9.1V rising turn-on), and drives up to 60V of LEDs at 1A (when PVIN is less than VLED).


DC1772A features both PWM and analog dimming of the LED string. It has an OPENLED flag that indicates when the LED string has been removed. DC1772A features high efficiency at 350kHz switching frequency. At high LED string voltages up to 60V and 1A of LED current, the single switch controller has 94% efficiency. The open LED overvoltage protection uses the IC’s constant voltage regulation loop to regulate the output to approximately 69.8V if the LED string is opened although it may reach 74V peak during transient from running LEDs to open. The maximum LED string voltage can be raised from 60V to 65V (or higher) with a simple charge of feedback resistors.


 
DC1772A
LT3761EMSE Demo Board I Boost LED Controller, Internal PWM Dimming, 8V to 60VIN, VOUT up to 60V
DC1772A Demo Board DC1772A Demo Board DC1772A Demo Board DC1772A Demo Board DC1772A - Schematic

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