45W LED driver for dimmable SSL applications

31st March 2014

Nat Bowers

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Datasheet

Addressing dimming performance, heat and cost in high power, dimmable solid state lighting applications, the iW3600 is a single-stage LED driver. Introduced by Dialog Semiconductor, the 45W output LED driver seamlessly dims from 100% down to 1% of measured light with virtually no dead travel and offers low pop-on current to turn light on at very low dimmer levels (less than 5% of light output).

Designed for retrofit bulbs including external, dimmable lighting ballast drivers and A19, PAR and T8 bulb replacements used in existing phase-cut dimmer installations, the iW3600 incorporates Dialog’s patented intelligent dimming control to provide compatibility with a wider range of dimmers, including TRIAC, digital and universal dimmers. This technology uses digital analytics to query the dimmer and applies algorithms that automatically adapt to the dimmer type.

The LED driver also uses Dialog’s patented, configurable over-temperature protection (OTP) derating to tackle LED bulb lifetime issues caused by excessive heat, while its single-stage, digital design lowers Bill Of Material (BOM) costs for lighting OEMs. Most power ICs are designed with thermal shutdown, which simply shuts the IC down in high temperature environments. This procedure protects the IC, but not the LED driver circuit, since most control IC shutdown occurs well above safe operating temperatures for electrolytic capacitors.

The iW3600’s built-in configurable temperature derating technology monitors the temperature inside the sealed SSL bulb and, in high temperatures, automatically reduces current drive to the LEDs in small, virtually imperceptible increments, then seamlessly restores brightness as temperature falls. This results in cooler operation in low airflow bulb installations, avoids exceeding the temperature rating of the electrolytic capacitors, and helps ensure a predictable and safer bulb operating life.

The 45W LED driver meets or exceeds global regulations for power quality and efficiency with low total harmonic distortion of less than 20%.and high power factor of more than 0.92. The iW3600 is available now in production quantities. It comes in a standard, 8-lead SOIC package and is priced at $0.52 (USD) each in 1000 unit quantities.