RT8487

RT8487 High Efficiency BCM LED Driver Controller for High Power Factor Offline Applications General Description The RT8487 is a Boundary mode high PF floating buck constant LED current output controller with an internal gate driver. The RT8487 features a ZCS detector which keeps system operating in BCM and obtaining excellent power efficiency, better EMI performance. The RT8487 achieves high power factor correction (PFC) and low total harmonic distortion of current (THDi) by a smart internal line voltage compensation circuit which has minimized system component counts; saved both PCB size and total system cost. Especially, the RT8487 can use a cheap simple drum core inductor in the system instead of an EE core to obtain high efficiency. The RT8487 is housed in a TSOT-23-6 package. Thus, the components in the whole LED driver system can be made very compact. Features  Support High Power Factor and THDi Consideration Applications  Programmable Constant LED Current with Highly Precision Current Regulation  Extremely Low Quiescent Current Consumption and 1µA Shutdown Current  True Low System BOM Cost and Economical Floating Buck Converter Solution  Unique Programmable AND Pin for ZVS Setting to Achieve Best Power Efficiency  Universal Input Voltage Range with Off-Line Topology  Built-in Over Thermal Protection  Built-in Over Voltage Protection  Output LED String Open Protection  Output LED String Short Protection  Output LED String Over Current Protection Ordering ...