Single-Stage, 45W, Non-Dimmable Off-Line Buck SSL LED Driver with High PF and Low Ripple

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High power factor and low-ripple current

The iW3625 integrates high power factor (PF), low output ripple and low total harmonic distortion (THD) in a single-stage SSL LED driver for isolated and non-isolated, high-power, non-dimmable LED replacement bulbs and LED ballasts. 

The iW3625 integrates a unique hybrid control scheme that allows designers to select power factor between >0.7 and >0.95, to manage the trade-off between PF and LED output current ripple.  This unique feature enables high PF and low ripple in a low-cost solution.  With both isolated and non-isolated buck topologies instead of the traditional flyback, the iW3625 offers higher efficiency in non-isolated applications.  And, by using a MOSFET switch, the device is capable of driving LEDs in solutions up to 45W output power.

The iW3625 reduces the BOM cost and solution size by incorporating Dialog’s proprietary PrimAccurate™ technology, eliminating the need for a secondary-side regulator and optical feedback isolator.  Dialog's advanced technology allows for the functionality and performance of an eight pin part in a small SOT23 6-pin package.

For Buck-Boost or Flyback 45W Applications see the iW3622


  • Configurable PF to Manage Trade-Offs Between PF and Output Ripple
    • PF from >0.7 (Lower Ripple) to >0.95 (Higher Ripple)
  • High Efficiency (>90%) Buck Topology, Isolated and Non-Isolated Applications
  • Low THD <20%
  • Single-Stage LED Driver in SOT23 6-pin Package
    • Two Dual-Function Pins - Allows for Functionality of an 8-pin Part in a 6-pin Package
  • Ideal for 45W Off-Line Solid-State Lighting Applications


  • User-Configurable LED Derating Over Temperature Protection
    • Works with an External NTC or Internal Sensor
    • Selectable Temperature Threshold and Derating Percentage
    • Maintains Light Output in Fault Condition
    • Hysteresis Allows Smooth Transition Back to Normal Operation
  • Fully Protected
    • Over-Voltage/Over-Temperature Protection
    • Output Over-Voltage, Over-Current and Short Circuit
    • Open LED Fault Detection
    • Sense-Resistor Short Circuit Protection


  • Solid State Lighting
  • LED Lighting Ballast

Block Diagrams

Typical Applications Diagram
Functional Block Diagram


Product Briefs and Summaries

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