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RT8487 の電気的特性と機能

RT8487のメーカーはRichtekです、この部品の機能は「High Efficiency BCM LED Driver Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 RT8487
部品説明 High Efficiency BCM LED Driver Controller
メーカ Richtek
ロゴ Richtek ロゴ 




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RT8487 Datasheet, RT8487 PDF,ピン配置, 機能
RT8487
High Efficiency BCM LED Driver Controller for High Power
Factor Offline Applications
General Description
The RT8487 is a Boundary mode high PF floating buck
constant LED current output controller with an internal
gate driver.
The RT8487 features a ZCS detector which keeps
system operating in BCM and obtaining excellent
power efficiency, better EMI performance.
The RT8487 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 RT8487 can use a cheap simple drum
core inductor in the system instead of an EE core to
obtain high efficiency.
The RT8487 is housed in a TSOT-23-6 package. Thus,
the components in the whole LED driver system can be
made very compact.
Features
Support High Power Factor and THDi
Consideration Applications
Programmable Constant LED Current with Highly
Precision Current Regulation
Extremely Low Quiescent Current Consumption
and 1µA 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
Ordering Information
RT8487
Package Type
J6 : TSOT-23-6
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Marking Information
Applications
E27, PAR, Light Bar, Offline LED Lights
Pin Configurations
(TOP VIEW)
SENSE VC AND
654
23
VCC GND GATE
TSOT-23-6
00=DNN
00= : Product Code
DNN : Date Code
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8487-00 March 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

1 Page





RT8487 pdf, ピン配列
RT8487
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 VCC
Supply Voltage Input. For good bypass, a ceramic capacitor near the VCC
pin is required.
2 GND
Ground.
3 GATE Gate Driver Output for External MOSFET Switch.
4 AND
AND Function Pin.
5 VC
Close Loop Compensation Node.
6
SENSE
LED Current Sense Input. The typical sensing threshold is 250mV between
the SENSE and GND pin.
Function Block Diagram
VCC
SENSE
Regulator
+
EA
-
V 250mV
State Machine
A
GATE
GND
VC AND
Operation
The RT8487 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.
DS8487-00 March 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3


3Pages


RT8487 電子部品, 半導体
RT8487
Typical Operating Characteristics
Operating Current vs. Supply Voltage
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
GATE with 1nF
10 20 30
Supply Voltage (V)
40
40
39
38
37
36
35
34
33
32
31
30
-50
OVP vs. Temperature
-25 0 25 50 75 100 125
Temperature (°C)
Sense Threshold vs. Supply Voltage
500
450
400
350
300
250
200
150
100
50
0
0 10 20 30 40
Supply Voltage (V)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
6
Operating Current vs. Temperature
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-50
-25
VCC = 24V, GATE with 1nF
0 25 50 75
Temperature (°C)
100 125
20
18
16
14
12
10
8
6
4
2
0
-50
UVLO vs. Temperature
UVLO_ON
UVLO_OFF
-25 0 25 50 75 100 125
Temperature (°C)
Sense Threshold vs. Temperature
500
450
400
350
300
250
200
150
100
50
0
-50
VCC = 24V
0 50 100
Temperature (°C)
150
is a registered trademark of Richtek Technology Corporation.
DS8487-00 March 2015

6 Page



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