RENESAS IW3605-02

The iW3605 is a single-stage, high-performance AC/DC offline power controller for dimmable LED luminaires. It employs advanced digital control technology to detect dimmer type, provide dynamic impedance for dimmer interfacing, and control LED brightness simultaneously. With advanced dimmer detection technology, the iW3605 is compatible with most wall dimmers, including leading-edge (resistive or resistive-inductive) and trailing-edge (resistive-capacitive) types. In addition, the iW3605's cycle-by-cycle waveform analysis enables fast dimmer setting response. When no dimmer is present on the line, the iW3605 optimizes power factor and minimizes AC line current harmonic distortion. Furthermore, without a dimmer, the output current can be regulated to the nominal output current value over a wide input voltage range. The iW3605 operates the main power converter in quasi-resonant mode to deliver current to the LED load, achieving high power efficiency and minimizing EMI. Commonly used converter topologies for the iW3605 include buck-boost and flyback. Utilizing Dialog's patented PrimAccurate™ primary-side sensing technology, it achieves excellent LED current regulation across varying AC line and LED load voltages without requiring secondary-side feedback circuitry, thereby eliminating the need for an optocoupler. The iW3605 reduces external component count by eliminating the secondary feedback circuit and bleeder circuit. Moreover, the iW3605's digital control loop maintains stability under all operating conditions, requiring no loop compensation components.

• Isolated/non-isolated offline 120VAC / 230VAC LED driver, output power up to 25W
• Wide line frequency range (45Hz to 66Hz)
• Compliant with IEC61000-3-2 current harmonic requirements
• Total harmonic distortion < 20%, power factor > 0.92
• Wide dimmer compatibility
  • Leading-edge dimmers
  • Trailing-edge dimmers
• No bleeder required at output power as low as 5W for 120VAC / 230VAC
• Resonant control for high efficiency (typically > 82% without dimmer)
• Over-temperature LED current foldback
• Tight LED current regulation (±5%)

• Dimmable LED retrofit lamps up to 25W
• Dimmable LED luminaires up to 25W