RT8497 Datasheet, PDF (1/12 Pages) Richtek Technology Corporation – Power MOSFET Integrated High Efficiency BCM LED Driver

RT8497
Power MOSFET Integrated High Efficiency BCM LED Driver
Controller for High Power Factor Applications
General Description
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.
Ordering Information
RT8497
Package Type
S : SOP-8
Lead Plating System
G : Green (Halogen Free and Pb Free)
MOSFET Built-In
Default : 500V/5.2
A : 500V/2 
B : 550V/4.2 
C: 550V/7
Features
 Built-In Power MOSFET
 Support High Power Factor and THDi
Consideration Applications
 Programmable Constant LED Current with Highly
 Precision Current Regulation
 Extremely Low Quiescent Current Consumption
and 1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
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)
SGND
VC
AND
SOURCE
8
2
7
3
6
4
5
SOP-8
VCC
NC
DRAIN
DRAIN
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
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8497-01 July 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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