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Product details

Parameters

Input voltage (type) DC Linear, DC/DC Vin (Min) (V) 6 Vin (Max) (V) 70 Iout (Max) (A) 1.5 Vout (Min) (V) 0 Vout (Max) (V) 70 Regulated outputs (#) 1 Topology Current Sink, Multi-Channel Dimming method Analog Power factor correction (Min) Features Integrated Switch, Thermal Shutdown Operating temperature range (C) -40 to 125 Switching frequency (Min) (kHz) 0 Switching frequency (Max) (kHz) 0 Iq (Typ) (mA) 0.55 Vref (V) 0.2 open-in-new Find other General lighting LED drivers

Package | Pins | Size

HSOIC (DDA) 8 19 mm² 4.9 x 3.9 PFM (NEC) 7 45 mm² 10.16 x 4.45 open-in-new Find other General lighting LED drivers

Features

  • Easy to Design for Lighting Systems Consisting of Multiple LED Strings (Supports Modular Design)
  • Automatically Balances the Current of Every Active LED String, even the Forward Voltage of Each String is Different
  • Easy to Pre-Set and Fine-Tune Current Ratio Among LED Strings (e.g., color temperature adjustment or CRI Enhancement)
  • ±1% Current Accuracy at Room Temperature and ±1.5% Over Temperature
  • Maintains Constant Output Power if Some Strings Open (inactive) by Automatically Balancing the Current of Remaining Active LED Strings
  • Works with a Constant Current Power Supply (ac/dc or dc/dc), and no Communication to/from the Constant Current Power Supply is Required
  • Operates with Minimum Voltage Overhead to Maximize Power Efficiency
  • Wide Input Voltage Range from 6 V to 70 V
  • Fault Status Output
  • Thermal Shutdown
  • Integrated 70-V, 1.5-A MOSFET with 2.06 A Current Limit
  • Maximum 70-V per LED String, 20 LEDs
  • Linear Circuitry Does Not Deteriorate EMI
  • DDA-8 Exposed Thermal Pad and TO220-7 Packages
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Description

The LM3466 integrates a linear LED driver for lighting systems which consist of multiple LED strings powered by a constant current power supply. It balances the current provided by the supply in a pre-set ratio for each active LED string, where an active string is a fully turned on LED string, regardless of the number of strings connected to the supply or the forward voltage of each LED string. If any LED string opens during operation, the LM3466 automatically balances the supply current through all of the remaining active LED strings. As a result, the overall brightness of the lighting system is maintained even if some LED strings open during operation.

The LM3466 lighting system is simple to design owing to a proprietary control scheme. To minimize the component count, the LM3466 integrates a 70-V, 1.5-A, N-channel power MOSFET with a current limit of 2.06 A. To add one more LED string to the system, only a single resistor, a capacitor, and a LM3466 are required. Other supervisory features of the LM3466 include under-voltage lock-out, fault reporting, thermal latch off, and thermal shutdown protection.

The LM3466 consists of only linear circuitry so that the EMI of the application circuit is not deteriorated. The LM3466 lighting system is EMI friendly if the constant current power supply used is complied to EMI standards. The LM3466 is available in the DDA-8 exposed thermal pad and TO220-7

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Technical documentation

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No results found. Please clear your search and try again. View all 8
Type Title Date
* Datasheet Multi-String LED Current Balancer for Use with Constant Current Power Supplies datasheet (Rev. F) Sep. 12, 2013
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical articles Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Technical articles LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
Technical articles Take better selfies with innovative LED flashes Nov. 18, 2014
Technical articles Solving the automotive EMI issues in new cars with all the screens Sep. 10, 2014
User guides AN-2182 LM3466 Demonstration Board Reference Design (Rev. A) May 01, 2013
More literature LM3466 Smart Linear LED Driver for Multi-Channel LED Systems Sep. 27, 2011

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$49.00
Description

The LM3466 integrates a linear LED driver for lighting systems which consist of multiple LED strings powered by a constant current power supply. The LM3466 equalizes the current provided by the supply in a pre-set ratio for each active LED string, where an active string is a fully turned on LED (...)

Design tools & simulation

SIMULATION MODELS Download
SNOM462.ZIP (63 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
Universal Input 45W AC-DC LED Driver Reference Design
PMP6011 — This design provides the ability to drive multiple LED strings with current matching from an AC source from 90VAC to 300VAC. The circuit is power factor corrected and provides high efficiency and good line regulation.
Design files
REFERENCE DESIGNS Download
30W Smart Current Equalizer with color temperature selection for panel lamp application
PMP8009 — This demonstration board is aimed to drive 30W 6 channels LED system powered by constant current power supply. Thanks to the intelligent circuitry inside LM3466, the solution can provide accurate adjustable current branch equalization, well controlled current limit protection, adjustable color (...)

CAD/CAE symbols

Package Pins Download
SO PowerPAD (DDA) 8 View options
TO-220 (NEC) 7 View options

Ordering & quality

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