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

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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.



  • 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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