- 您现在的位置：买卖IC网 > Sheet目录356 > SC4539ULTRT (Semtech)IC LED DRIVR CONST CURRENT 8MLPD
SC4539
Applications Information (continued)
Diode Selection
For optimum performance, it is recommended that a
Schottky diode with a reverse voltage of 40V and a forward
current rating of 1A like the Central Semiconductor
Corporation CMOSH-4E be used. Diodes with lower
voltage ratings can be used, but performance should be
compared to the performance with this 40V part to ensure
stable operation is maintained.
PCB Layout Considerations
Poor layout can degrade the performance of the DC-DC
converter and can be a contributory factor in EMI prob-
lems, ground bounce, thermal issues, and resistive voltage
losses. Poor regulation and instability can result. A typical
layout is shown in Figure 2.
The following design rules are recommended:
Selection of Other Components
R ISET sets the maximum load current for the SC4539. Use
the following equation to select the proper value:
R ISET = 230 × V ISET /I LOAD
where
?
?
?
Place the inductor and filter capacitors as close
to the device as possible and use short, wide
traces between the power components.
Route the output voltage feedback path away
from the inductor and LX node to minimize
noise and magnetic interference.
Use a ground plane to further reduce noise
interference on sensitive circuit nodes.
V ISET = 0.5V (typ).
Refer to Figure 1 for selecting values for other current set-
tings. Notice that the error increases as the desired I BL
current decreases.
100
10
R ISET
Typical
Current
Tolerance
1
1
10
R ISET (k Ω )
100
Figure 1 – Set Resistor Value Selection Graph
Figure 2– Layout
12
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
SC4540ULTRT
IC LED DRIVR CONST CURRENT 8MLPD
SC4541SKTRT
IC LED DRVR BACKLIGHT SOT23-6
SC5010ULTRT
IC LED DRVR BACKLIGHT I2C 28QFN
SC600BIMLTRT
IC LED DRIVR WHITE BCKLGT 10-MLP
SC618ULTRT
IC LED DRIVER PHOTO FLASH 10-MLP
SC620ULTRT
IC LED DRIVER LINEAR 16-MLPQ
SC628AULTRT
IC LED DRIVER
SC667ULTRT
IC LED DRVR LMU 7CH MLPQUT20
相关代理商/技术参数
SC453EVB
制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Portable, VID Programmed Single Phase Power Supply Controller
SC453MLTRT
制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Portable, VID Programmed Single Phase Power Supply Controller
SC453TS.TRT
制造商:SEMTECH 功能描述:I.C.
SC453TSTRT
制造商:Semtech Corporation 功能描述:Power Supply Controller 28-Pin TSSOP T/R
SC454
制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Single-Phase Single Chip IMVP-6/6+ Vcore Power Supply
SC454_09
制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Single-Phase Single Chip IMVP-6/6+ Vcore Power Supply
SC4540
制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:High Effi ciency Boost Converter for up to 10 LEDs
SC4540EVB
制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:High Effi ciency Boost Converter for up to 10 LEDs
