FTM Board Club
Offline Triac Dimmable Isolated LED Driver Demonstration Board

The ISL1904DEMO1Z demo board converts a high line AC input voltage to a 18V, 700mA DC output. It is implemented with Intersil’s critical conduction mode (CrCM) LED driver controller, theISL1904. It demonstrates the fundamental functions of ISL1904, including soft-start, dimming, over-voltage protection, short circuit protection, etc.

The circuit operates in CrCM with variable frequency and allows near zero-voltage switching (ZVS). Typical efficiency is about 81% at full load. The ISL1904DEMO1Z demo board supports phase dimming and is compatible with wide variety of leading and trailing edge dimmers available in the market. This application note covers the performance data, critical waveforms, extensive dimming data, schematics, layout and bill of materials.

  • Input voltage VIN: 176V to 264V
  • Output voltage VO: 12V to 20V
  • Output current IO: 700mA (14W)
  • Board dimensions: 682615mm3(LWH)
  • Input power factor greater than 0.93 at nominal
  • Total harmonic distortion less than 7% at nominal
  • Peak efficiency at full load: 81%
  • 0-100% flicker free dimming with leading and trailing edge dimmers