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RT8497のメーカーはRichtekです、この部品の機能は「Power MOSFET Integrated High Efficiency BCM LED Driver Controller」です。 |
部品番号 | RT8497 |
| |
部品説明 | Power MOSFET Integrated High Efficiency BCM LED Driver Controller | ||
メーカ | Richtek | ||
ロゴ | |||
このページの下部にプレビューとRT8497ダウンロード(pdfファイル)リンクがあります。 Total 13 pages
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
1 Page 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
3Pages RT8497
Typical Application Circuit
Bridge Rectifier
+
- CIN
R1
3 AND
R3
(Optional) 2 VC
5, 6
DRAIN
RT8497
VCC 8
1 SGND
C1 C2
4
SOURCE
Optional
D2
Bootstrap diode
R2 L1
D1 EC1
Figure 1. Typical Application of Buck Type
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
6
is a registered trademark of Richtek Technology Corporation.
DS8497-02 October 2015
6 Page | |||
ページ | 合計 : 13 ページ | ||
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PDF ダウンロード | [ RT8497 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
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