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AN4130 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN4130 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 41 page September 2012 Doc ID 023315 Rev 1 1/41 AN4130 Application note STEVAL-ILL045V1: 120 V A19 dimmable high power factor 9 W LED driver using the HVLED815PF By Thomas Stamm Introduction The STEVAL-ILL045V1 demonstration board showcases ST's new HVLED815PF LED driver chip. It solves the problem of low-cost drive circuitry for LED replacements for 40 W incandescent or equivalent compact-fluorescent lamps. The HVLED815PF is a new integrated power controller using primary-side control to achieve LED current regulation within +/-5%. (It also has primary-side voltage regulation, used here for open load protection.) The device incorporates an 800 V avalanche-rated FET and fits in a standard SO-16 package. An internal startup circuit eliminates the need for external rapid-start circuitry. The PFC-flyback power converter operates in transition mode for highest efficiency and best use of components. With the addition of a few extra components the HVLED815PF draws near-sinusoidal input current from the AC line. The circuit regulates LED current over a wide range of line voltage and LED string voltage, and is dimmable with standard Triac-based dimmers. Figure 1. Images top and bottom www.st.com |
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