High Efficiency BCM LED Driver Controller for High Power
Factor Offline Applications
The RT8487 is a Boundary mode high PF floating buck
constant LED current output controller with an internal
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.
Support High Power Factor and THDi
Programmable Constant LED Current with Highly
Precision Current Regulation
Extremely Low Quiescent Current Consumption
and 1µ A 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
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
J6 : TSOT-23-6
Lead Plating System
G : Green (Halogen Free and Pb Free)
Richtek products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
00= : Product Code
DNN : Date Code
E27, PAR, Light Bar, Offline LED Lights
SENSE VC AND
VCC GND GATE
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
DS8487-02 October 2017
is a registered trademark of Richtek Technology Corporation.