AC/DC LED driver
16 May 2012
Opto-Electronics
New from Marvell is the 88EM8183 deep dimming single-stage AC/DC LED driver IC. It delivers high dimmer compatibility and low component count, while providing light quality and dimming performance comparable to incandescent bulbs.
Leveraging Marvell’s mixed-signal architecture and advanced dimming control technology, the device is designed to achieve smooth deep dimming as low as 1% LED current. It is also designed to be compatible with more than 100 different types of TRIAC wall box dimmers from various manufacturers. By reducing the number of components needed for LED drivers and shrinking necessary board space, the IC enables OEMs and ODMs to bring LED lighting to all kinds of lamp form-factors, including A19, PAR, BR, GU10 and candle, without compromising dimming performance.
The 88EM8183 supports universal AC input and a wide range of LED output power from a few Watts up to 100 Watts. It employs a primary side current control method, which eliminates the need for an optocoupler and associated feedback circuit while delivering high regulation accuracy over wide range AC input. It also integrates a high-voltage startup circuit to supply power to the chip during power-up, eliminating an external field-effect transistor (FET) and associated power circuits.
The device monitors dimmer status and manages dimmer load to maintain proper operations through the internal digital core and analog circuit, eliminating external dimmer bleeder circuits required by other solutions. It delivers up to 90% efficiency, power factor above 0,95 and lower than 20% total harmonic distortion. The IC supports both flyback and buck-boost topologies for isolated and non-isolated bulbs.
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