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Digital Constant-Voltage Offline PWM Controller with Power Factor Correction for Applications up to 90W


90W Capable, Constant-Voltage PWM Controller in SOT-23 for Smart Lighting

The iW3627 is a digital off-line PWM controller that provides a constant voltage for smart LED lighting applications up to 90W with high power factor (PF > 0.9) and low THD (< 20%). It supports the most common single-stage isolated and non-isolated topologies (Buck, Buck-Boost or Flyback) as a front-end or standalone power supply in SSL applications with advanced digital control technology.

Lifecycle status

● Active


Up to 90W Output Power with Enhanced Internal MOSFET Driver

Supports Isolated or Non-Isolated Topologies Including Flyback, Buck or Buck-Boost

High PF (> 0.9) and Low THD (< 20%)

Adaptive Output Voltage Transient Detection

  • Enables Fast Transient Response with Variation < +/-10% of nominal output voltage

Accommodates Large Capacitance  Variations and Capacitor Aging Configurable Minimum Switching Frequency

  • Enables Low No-Load Standby Power Consumption (< 200mW)

Configurable PWM Maximum Switching Frequency

  • Optimizes for High Efficiency, Small Size

Active Start-Up – Reduces Turn-On Time without Increasing Stand-By Power

Tiny 6 Pin SOT-23 Package

Fully Protected

  • Input Brown-Out Protection
  • Over-Temperature Protection
  • Output Over-Voltage, Over-Current and Over-Load Protection


Smart LED Lighting

LED Lighting Ballasts

Front-End Pre-Regulator

Block Diagrams


Typical Applications Diagram


Functional Block Diagram

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Product Briefs and Summaries
Name Date Version
iW3627 Product Summary (594.48 KB) 28/06/2016 1.4
iW3627 Product Summary (Chinese) (673.27 KB) 09/10/2018 1.3
Name Date Version
iW3627 Datasheet (1.34 MB) (Registered users only) 07/09/2018 1.5
Reference designs
Name Date Version
Reference Design EBC20048: iW3627-00, iW3638-02 and iW339-00, 90V-305VAC Input, 42V/1.5A Output, 0-10V Dimmable External LED Driver Design (8.46 MB) (Registered users only) 13/02/2019 1.1
Reference Design EBC20056: iW3627-00, iW3638-01 and iW339-00, 90V-305VAC Input, 42V/1.35A Output, 0-10V and BLE Dimmable External LED Driver Design (11.93 MB) (Registered users only) 20/12/2018 1.0