RT8487

Copyright © 2015 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS8487-00

March

2015

www.richtek.com

1

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.

Ordering Information

Package Type

J6 : TSOT-23-6

Lead Plating System

G : Green (Halogen Free and Pb Free)

RT8487

Note :

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.

Marking Information

00= : Product Code

DNN : Date Code

00=DNN

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

Applications



E27, PAR, Light Bar, Offline LED Lights

Pin Configurations

(TOP VIEW)

VCC GND GATE

SENSE VC AND

4

2

3

5

6

TSOT-23-6