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reference designLT3761A

Analog Devices LT3761A

60VIN LED Controller with Internal PWM Generator

Overview

TopologySEPIC Buck-Boost Topology
Input voltage5-18 V
Switching frequency100-1000 kHz
Output 12.5 A

Description

The LT®3761A 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 LT3761A 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 LT3761A 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%. The LT3761A offers improved accuracy of internal PWM dimming over LT3761. 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.

Features

  • 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 and Reporting
  • 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

Typical applications

  • Battery and SuperCap Chargers/ Accurate Current Limited Voltage Regulators
  • High Voltage LED Strings >100V with Ground Referred Current Sense/ Grounded Anode LEDs

More information

Products

Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L1(µH)
L2(µH)
IR(A)
IR 2(A)
ISAT(A)
RDC1 typ(Ω)
RDC2 typ(Ω)
RDC1 max(Ω)
RDC2 max(Ω)
fres(MHz)
Type
SamplesAvailability & Sample
744870004
SPECWE-DD SMT Shielded Coupled Inductor, 4.7 µH, 4.7 µH
Simu­lation
Availability
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-DD SMT Shielded Coupled Inductor
Inductance 14.7 µH
Inductance 24.7 µH
Rated Current3.6 A
Rated Current 23.6 A
Saturation Current10 A
DC Resistance 10.025 Ω
DC Resistance 20.025 Ω
DC Resistance 10.03 Ω
DC Resistance 20.03 Ω
Self Resonant Frequency34 MHz
TypeCrossed 
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