High Efficiency BCM LED Driver Controller for High Power Factor Offline Applications


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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.


  • E27, PAR, Light Bar, Offline LED Lights
Key Spec.
Status Active
Supply Voltage (min) (V) 10
Supply Voltage (max) (V) 30
Vin (min) (V) 18
Vin (max) (V) 264
Topology Buck;Buck-Boost
Output C.C.
MOSFET Integrated No
Current Sense Threshold (mV) 250
Features OCP;OVP;UVP
Package Type TSOT-26
  • 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
TitleLast UpdateShareDownload
High Efficiency BCM LED Driver Controller for High Power Factor Offline Applications2015/07/27
Technical Documents
TitleLast UpdateShareDownload
Power Solutions for LED Lighting Applications2018/11/22
Minimizing Light Flicker in LED Lighting Applications2018/08/15
Additional Documents
Title Last Update ShareDownload
AC/DC Non-Isolated BCM Floating Buck LED Driver Controller - RT8487, RT8497 2019/03/04
Non-isolated LED Lighting Driver IC Performance Test Report - RT8487, RT8497 2019/03/04
Evaluation Boards
TitleLast UpdateShareDownload
RT8487 High Efficiency BCM LED Driver Controller for High Power Factor Applications2018/11/08
Design Tool
TitleLast UpdateShare
RT8487 Design tool2019/09/11
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8487GJ6TSOT-263000 Not available Buy from Distributor