Power MOSFET Integrated High Efficiency BCM LED Driver
Controller for High Power Factor Applications
The RT8497 integrates a power MOSFET and a
Boundary mode controller. It is used for step down
converters by well controlling the internal MOSFET and
regulating a constant output current.
The RT8497 features a ZCS detector which keeps
system operating in BCM and obtaining excellent
power efficiency, better EMI performance.
The RT8497 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 RT8497 can use a cheap simple drum
core inductor in the system instead of an EE core to
obtain high efficiency.
The RT8497 is housed in a SOP-8 package. Thus, the
components in the whole LED driver system can be
made very compact.
S : SOP-8
Lead Plating System
G : Green (Halogen Free and Pb Free)
Default : 500V/5.2
A : 500V/2
B : 600V/4.2
C : 600V/7
D : 600/3.2
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
Built-In Power MOSFET
Support High Power Factor and Low THDi
Programmable Constant LED Current with
High-Precision Current Regulation
Extremely Low Quiescent Current Consumption
and 1A Shutdown Current
Compact Floating Buck Topology with Low
Component Counts, Small PCB Size, and Low
System BOM Cost
Unique Programmable AND Pin for ZVS Setting
to Achieve Best Power Efficiency
Support Off-Line Universal Input Voltage Range
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
E27, PAR, Light Bar, Offline LED Lights
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8497-02 October 2015
is a registered trademark of Richtek Technology Corporation.