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iW380

Second-Stage 78V Buck LED Driver with Dialog’s Flicker-Free True DC Dimming Technology for Commercial Lighting

iW380 Typical Applications Diagram

Dimming Resolution of 0.0625% Meets DALI Requirements with 0.0625% to 100% Range

The iW380 high-resolution buck LED driver with Dialog’s True DC dimming technology enables high performance dimmable commercial lighting systems. The device works from a 78V input voltage as a second-stage converter in an AC/DC lighting system or as a stand-alone DC/DC converter. The iW380 accepts both analog (DC) or PWM dimming inputs to provide an exceptional dimming range from 0.0625% to 100% in 0.0625% steps with an integrated light-off mode. The device also works with a resistor set dimming input to offer a true 3-in-1 dimmer compatibility. The iW380 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%.

Features

Single-Stage DC/DC Non-Isolated Buck Controller

Supports Wide DC Input Voltage with Tight Output Current Regulation (±3%)

Output Power up to 150W

Wide Output Voltage Range Support – 5V to 98% of the Input Voltage

High Performance Dimming

  • 0.0625% Dimming Resolution
  • 0.0625% to 100% Dimming Range
  • True DC Dimming with No Ripple Across Entire Dimming Range
  • Light-Off Mode - Completely Turn-Off LED Light at Minimum Dimming Input

Two DIM Pins – Supports PWM/Analog Inputs and RSET Input

  • RSET + 0-10V
  • MCU (DALI or Wireless) + 0-10V

Supports Constant Current (CC), Constant Voltage (CV), Constant Power (CP) Operating Modes

Fully Protected

  • Output Over-Voltage, Output Short, Over-Current, Peak Current Limit, Sense-Resistor Short Protection
  • Input Voltage Under-Voltage and Over-Voltage Protection
  • Built-In Over-Temperature Protection Small SOIC 10-Lead Package

Small SOIC 10-Lead Package

Applications

Commercial Lighting:

  • Wireless and Intelligent LED Lighting Systems
  • DALI Lighting Systems
  • 0-10V Dimming
  • External Fixture Drivers

Block Diagrams

iW380 Typical Applications Diagram

Typical Applications Diagram

iW380 Functional Block Diagram

Functional Block Diagram

Sample Request Form

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Product Briefs and Summaries
Name Date Version
iW380 Product Summary (464.22 KB) 19/02/2021 0.41
Datasheets
Name Date Version
iW380 Datasheet (1.25 MB) (Registered users only) 19/02/2021 0.5