SNVS678F June   2010  – November 2015 LM3414 , LM3414HV

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Pulse-Level-Modulation (PLM) Operation Principles
      2. 7.3.2 Minimum Switch ON-time
      3. 7.3.3 Peak Switch Current Limit
      4. 7.3.4 PWM Dimming Control
      5. 7.3.5 Analog Dimming Control
      6. 7.3.6 Internal VCC Regulator
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Setting the Switching Frequency
      2. 8.1.2 Setting LED Current
      3. 8.1.3 Inductor Selection
    2. 8.2 Typical Applications
      1. 8.2.1 LM3414/HV Design Example
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Calculate Operating Parameters
          2. 8.2.1.2.2 Calculate RIADJ
          3. 8.2.1.2.3 Calculate RFS
          4. 8.2.1.2.4 Calculate LMIN
          5. 8.2.1.2.5 Calculate CIN-MIN
      2. 8.2.2 LM3414/HV Design Example (IOUT = 1 A)
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Calculate Operating Parameters
          2. 8.2.2.2.2 Calculate RIADJ
          3. 8.2.2.2.3 Calculate RFS
          4. 8.2.2.2.4 Calculate LMIN
          5. 8.2.2.2.5 Calculate CIN-MIN
        3. 8.2.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Related Links
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Supports LED Power up to 60 W (1): 18x 3-W HBLEDs
  • Requires No External Current Sensing Resistor
  • ±3% LED Current Accuracy
  • Up to 96% Efficiency
  • High Contrast Ratio (Minimum Dimming Current Pulse Width <10 µS)
  • Integrated Low-Side N-Channel MOSFET
  • Adjustable Constant LED Current From 350 mA to 1000 mA
  • Support Analog Dimming and Thermal Fold-Back
  • Wide Input Voltage Range:
    • 4.5 V to 42 V (LM3414)
    • 4.5 V to 65 V (LM3414HV)
  • Constant Switching Frequency Adjustable from 250 kHz to 1000 kHz
  • Thermal Shutdown Protection
  • Power Enhanced SOIC-8 or 3 mm × 3 mm WSON-8 Package

2 Applications

  • High Power LED Drivers
  • Architectural Lighting, Office Troffers
  • Automotive Lighting
  • MR-16 LED Lamps

3 Description

The LM3414 and LM3414HV are 1-A 60-W(1) common anode-capable constant current buck LED drivers. They are suitable for driving single string of 3-W HBLED with up to 96% efficiency. They accept input voltages from 4.5 VDC to 65 VDC and deliver up to 1-A average LED current with ±3% accuracy. The integrated low-side N-channel power MOSFET and current sensing element realize simple and low component count circuitry, as no bootstrapping capacitor and external current-sensing resistor are required. An external small-signal resistor to ground provides very fine LED current adjustment, analog dimming, and thermal fold-back functions.

Constant switching frequency operation eases EMI. No external loop compensation network is needed. The proprietary Pulse-Level-Modulation (PLM) control method benefits in high conversion efficiency and true average LED current regulation. Fast response time realizes fine LED current pulse fulfilling the 240 Hz 256-step dimming resolution requirement for general lighting.

The LM3414 and LM3414HV are available in SOIC-8 and 3 mm × 3 mm WSON-8 packages.

Device Information(2)

PART NUMBER PACKAGE BODY SIZE (NOM)
LM3414,
LM3414HV		 WSON (8) 3.00 mm × 3.00 mm
SOIC (8) 3.90 mm × 4.89 mm
  1. Thermal derating applies according to actual operation conditions.
  2. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Application Schematic

LM3414 LM3414HV 30124801.gif