RT8497.pdf 데이터시트 (총 13 페이지) - 파일 다운로드 RT8497 데이타시트 다운로드

No Preview Available !

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 : 600V/4.2
C : 600V/7
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
Features
Built-In Power MOSFET
Support High Power Factor and Low THDi
Applications
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
Applications
E27, PAR, Light Bar, Offline LED Lights
Pin Configurations
(TOP VIEW)
SGND
VC
AND
SOURCE
8
27
36
45
SOP-8
VCC
NC
DRAIN
DRAIN
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8497-02 October 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

No Preview Available !

RT8497
Marking Information
RT8497GS
RT8497
GSYMDNN
RT8497GS : Product Number
YMDNN : Date Code
RT8497BGS
RT8497B
GSYMDNN
RT8497BGS : Product Number
YMDNN : Date Code
RT8497DGS
RT8497D
GSYMDNN
RT8497DGS : Product Number
YMDNN : Date Code
RT8497AGS
RT8497A
GSYMDNN
RT8497AGS : Product Number
YMDNN : Date Code
RT8497CGS
RT8497C
GSYMDNN
RT8497CGS : Product Number
YMDNN : Date Code
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.
8 VCC
Supply Voltage Input of the Chip. For good bypass, a ceramic capacitor near the
VCC pin is required.
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8497-02 October 2015

No Preview Available !

Function Block Diagram
VCC
RT8497
SOURCE
+
-EA
+
-
250mV
Regulator
State
Machine
A
DRAIN
SOURCE
SGND
VC AND
Operation
The RT8497 senses true average output current and
keeps the system driving constant output current. The
VC pin is the compensation node in this close loop
system and dominates the frequency response. To
stabilize the system and achieve better PFC / THDi,
proper selection of a compensation network is needed.
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8497-02 October 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3

No Preview Available !

RT8497
Absolute Maximum Ratings (Note 1)
Supply Input Voltage ------------------------------------------------------------------------------------------------ 40V
DRAIN to SOURCE Voltage, VDS, (RT8497B, RT8497C, RT8497D) ---------------------------------- 0.3V to 600V
DRAIN to SOURCE Voltage, VDS, (RT8497, RT8497A) -------------------------------------------------- 0.3V to 500V
DRAIN Current, ID @ TC = 25C -------------------------------------------------------------------------------- 1.4A
DRAIN Current, ID @ TC = 100C ------------------------------------------------------------------------------ 0.9A
Power Dissipation, PD @ TA = 25C
SOP-8 ------------------------------------------------------------------------------------------------------------------- 0.53W
Package Thermal Resistance (Note 2)
SOP-8, JA ------------------------------------------------------------------------------------------------------------- 188C/W
Lead Temperature (Soldering, 10 sec.)------------------------------------------------------------------------- 260C
Junction Temperature ----------------------------------------------------------------------------------------------- 150C
Storage Temperature Range -------------------------------------------------------------------------------------- 65C to 150C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------- 2kV
MM (Machine Model) ------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions (Note 4)
Supply Input Voltage ------------------------------------------------------------------------------------------------ 10V to 30V
Ambient Temperature Range-------------------------------------------------------------------------------------- 40C to 85C
Junction Temperature Range ------------------------------------------------------------------------------------- 40C to 125C
Electrical Characteristics
(VCC = 24V, TA = 25C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
VCC UVLO ON
VUVLO_ON
17 18 19 V
VCC UVLO OFF
VUVLO_OFF
6.4 7.2
8
V
VCC Shut Down Current
ISHDN
VCC = 15V
-- -- 1 A
VCC Quiescent Current
IQ
Drain stands still
-- 0.5 5 mA
VCC Operating Current
ICC
By CGATE = 1nF, Freq. = 20kHz -- 1 5 mA
VCC OVP Level
VOVP
-- 34 -- V
Current Sense Threshold
VSENSE
242.5 250 257.5 mV
AND Pin Leakage Current
IAND
VAND = 5V
-- 1 2 A
RT8497
-- 5.2 --
Static Drain-Source
On-Resistance
RDS(ON)
VGS = 12V, ID
= 100mA
RT8497A
RT8497B
RT8497C
-- 2 --
-- 4.2 --
-- 7 --
RT8497D
-- 3.2 --
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
4
is a registered trademark of Richtek Technology Corporation.
DS8497-02 October 2015

No Preview Available !

RT8497
Parameter
Symbol
Test Conditions
Min Typ Max Unit
RT8497, VDS = 500V
RT8497A, VDS = 500V
Drain-Source Leakage Current IDSS
RT8497B, VDS = 600V
-- -- 10 A
RT8497C, VDS = 600V
RT8497D, VDS = 600V
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect
device reliability.
Note 2. JA is measured at TA = 25C on a high effective thermal conductivity four-layer test board per JEDEC 51-7.
Note 3. Devices are ESD sensitive. Handling precaution recommended.
Note 4. The device is not guaranteed to function outside its operating conditions
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8497-02 October 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5