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reference designLT3744 | Demoboard 1930A

Analog Devices LT3744 | Demoboard 1930A

High Current Synchronous Step-Down LED Driver

Overview

TopologyBuck Converter
Input voltage7-30 V
Switching frequency270-330 kHz
Output 16.05 V / 12 A
IC revisionA

Description

Demonstration circuit 1930A is a high current synchronous inverting buck-boost LED driver featuring the LT®3744. The unique drive stage used on the LT3744 allows the anodes of three LEDs to be connected together for better heat sinking in both the step-down configuration and the inverting buck-boost configuration. The pros and cons of each configuration can be found in the data sheet. This demonstration circuit 1930A is for customers to test the inverting buck-boost configuration. The step-down configuration is shown in a separate demonstration circuit DC2339A.

Features

  • Ideal for Driving Up to 40A LEDs
  • Up to 3000:1 PWM Dimming
  • 20:1 Analog Dimming
  • ±3% Current Regulation Accuracy
  • ±3% Voltage Regulation Accuracy
  • Unique Inverting Buck-Boost Topology AllowsGrounded Heat Sink to Be Used for RGB LEDs
  • 3.3V to 36V Input Voltage Range
  • Peak Current Mode with DC LED Current Sensing
  • Open and Shorted LED Protection and Fault Reporting
  • Floating LED Driver Allows Single Power Solution
  • Drive Multicolor LEDs or Single LED with ThreeDifferent Regulated Currents
  • Thermally Enhanced 5mm × 6mm QFN 36-LeadPackage

Typical applications

  • LED Driver for DLP Projectors / Heads-Up Displays / High Power LED

More information

Products

Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(mm)
f(mm)
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
Qty.
SamplesAvailability & Sample
702935000
SPECWA-SNSR Self-Retaining Spacer, 12.7 mm, 4.8 mm
Simu­lation–
Availability
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Downloads3 files

CAD files ZIP

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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWA-SNSR Self-Retaining Spacer
Length12.7 mm
Drilling in Panel4.8 mm
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MaterialPA66 
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744355182
SPECWE-HCI SMT Flat Wire High Current Inductor, 13 mm, –
Simu­lation
Availability
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Downloads9 files

EDA models: Components ZIP

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Electric models ZIP

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ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Length13 mm
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Inductance0.82 µH
Performance Rated Current44.5 A
Saturation Current @ 10%15 A
Saturation Current @ 30%35 A
DC Resistance0.9 mΩ
Self Resonant Frequency72 MHz
MaterialWE-PERM 
Packaging Unit400 
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