Overview

The iW3638 second-stage buck LED driver provides constant current to LEDs directly from DC power supplies. It supports a non-isolated buck converter topology to post-regulate from an off-line AC/DC converter, minimizing low frequency output ripple current and eliminating virtually all flicker in the system, even down to 1%.

A wide range of DC input voltages simplifies design by enabling the use of just one second-stage driver across any commercial lighting product portfolio.

iW3638 Functional Block Diagram
iW3638 Typical Applications Diagram
iW3638 Functional Block Diagram
iW3638 Typical Applications Diagram
  • Single-Stage DC/DC Buck
  • Supports Wide DC Input Voltage with Tight Output Current Regulation (±3%)
  • Output Power up to 90W
  • PrimAccurate™ Primary-Side Control for Excellent Output Current Regulation with No Direct Voltage and Current Feedback Components Needed
  • Independent Maximum Load Current Setting Interface
  • PWM Dimming
  • Supports 0-10V Dimming with iW339 Dimming Interface
  • Wide Dimming Range: 1% - 100%, with 1% Resolution
  • Configurable Minimum Dimming Setting
    • Dim-to-Off, 1%, 5% or 10%
  • Fully Protected
    • Output Overvoltage, Output Open, Output Short, Overcurrent, Peak Current Limit, Sense-Resistor Short Protections
    • Input Voltage Undervoltage Protection
    • Built-In Over-Temperature Protection or External NTC
    • Brown-In and Brown-Out Protection
  • Small SOIC 8-Lead Package

Applications

  • Commercial Lighting:
    • T8
    • 0-10V Dimming
    • External Fixture Drivers
    • Wireless and Intelligent LED Lighting Systems

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

Explore ECAD Models
Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
    Carrier Type
    Moisture Sensitivity Level (MSL)
    Buy / Sample
    Part Number
    IW3638-01
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    Samples Available
    		 SOIC-8 Tape & Reel 1 Get Samples,
    IW3638-02
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    Samples Available
    		 SOIC-8 Tape & Reel 1 Get Samples,
    IW3638-03
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    Samples Available
    		 SOIC-8 Tape & Reel 1 Get Samples,
    IW3638-02A
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    Samples Available
    		 SOIC-8 Tape & Reel 1 Get Samples,
    IW3638-31
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    Samples Available
    		 SOIC-8 Tape & Reel 1 Get Samples,
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