RT8497 Power MOSFET Integrated High Efficiency BCM LED Driver Controller for High Power Factor Applications General Description Features Built-In Power MOSFET The RT8497 integrates a power MOSFET and a Support High Power Factor and Low THDi Boundary mode controller. It is used for step down Applications converters by well controlling the internal MOSFET and Programmable Constant LED Current with regulating a constant output current. High-Precision Current Regulation The RT8497 features a ZCS detector which keeps Extremely Low Quiescent Current Consumption system operating in BCM and obtaining excellent and 1A Shutdown Current power efficiency, better EMI performance. Compact Floating Buck Topology with Low The RT8497 achieves high Power Factor Correction Component Counts, Small PCB Size, and Low (PFC) and low Total Harmonic Distortion of Current System BOM Cost (THDi) by a smart internal line voltage compensation Unique Programmable AND Pin for ZVS Setting circuit which has minimized system component counts to Achieve Best Power Efficiency saved both PCB size and total system cost. Support Off-Line Universal Input Voltage Range Especially, the RT8497 can use a cheap simple drum Built-in Over Thermal Protection core inductor in the system instead of an EE core to Built-in Over Voltage Protection obtain high efficiency. Output LED String Open Protection The RT8497 is housed in a SOP-8 package. Thus, the Output LED String Short Protection components in the whole LED driver system can be Output LED String Over Current Protection made very compact. Applications Ordering Information E27, PAR, Light Bar, Offline LED Lights RT8497 Package Type Pin Configurations S : SOP-8 (TOP VIEW) Lead Plating System G : Green (Halogen Free and Pb Free) 8 SGND VCC MOSFET Built-In 2 7 VC NC Default : 500V/5.2 3 6 AND DRAIN A : 500V/2 4 SOURCE 5 DRAIN B : 600V/4.2 C : 600V/7 SOP-8 D : 600/3.2 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. is a registered trademark of Richtek Technology Corporation. DS8497-02 October 2015 www.richtek.com 1 RT8497 Marking Information RT8497GS RT8497AGS RT8497GS : Product Number RT8497AGS : Product Number YMDNN : Date Code YMDNN : Date Code RT8497 RT8497A GSYMDNN GSYMDNN RT8497BGS RT8497CGS RT8497BGS : Product Number RT8497CGS : Product Number YMDNN : Date Code YMDNN : Date Code RT8497B RT8497C GSYMDNN GSYMDNN RT8497DGS RT8497DGS : Product Number YMDNN : Date Code RT8497D GSYMDNN Functional Pin Description Pin No. Pin Name Pin Function 1 SGND Ground of the Chip. 2 VC Close Loop Compensation Node. 3 AND Next Delay Timing Function Control. 4 SOURCE Internal Power MOSFET Source Connection. 5, 6 DRAIN Internal Power MOSFET Drain Connection. 7 NC No Internal Connection. Supply Voltage Input of the Chip. For good bypass, a ceramic capacitor near the 8 VCC VCC pin is required. Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS8497-02 October 2015 2
