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Exar has announced an improved AC step driver for LED lighting applications. Combined with other iML offerings, the iML8684 provides a complete solution for LED light bulb and LED tube applications, the firm claims.
Unlike conventional AC driver solutions, which use a single large driver, iML has patented a distributed architecture of multiple small, low-cost drivers which the company says provides increased flexibility and a lower overall bill-of-materials(BOM) cost through its use of much lower voltage technologies.It also claims improved heat dissipation as multiple devices are used across the PCB, evenly distributing the thermal load. IML devices remove the need for electrolytic capacitors and inductors that are mandatory for AC-DC driver solutions while delivering lower BoM costs, says Exar.
The iML8684 claims improved circuit stability in sub 3Vac situations created by TRIAC dimming, resulting in superior light quality at low dimming. This improvement also increases the number of compatible dimmers in both 120Vac and 230Vac countries."We are continuing to listen to our customers in order to provide improved solutions" says Exar's Gi-Young Lee. "By improving low-voltage stability we have achieved the widest range of TRIAC dimmer compatibility on the market."

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AC step driver for LEDs

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