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参数资料
| 型号： | SC4538ULTRT |
| 厂商： | Semtech |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT MLPD-8 |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 680kHz ~ 920kHz |
| 电源电压： | 2.8 V ~ 5.5 V |
| 输出电压： | 5 V ~ 38 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | MLPD-8 |
| 供应商设备封装： | 8-MLPD（2x2） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | SC4538ULDKR |
SC4538
Applications Information (continued)
Diode Selection
A Schottky diode with a reverse voltage of 40V and a
forward current rating of 1A should be used with this
device for optimum per formance. The Central
Semiconductor Corporation CMOSH-4E is a suitable diode
for this application.
Selection of Other Components
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:
R ISET sets the maximum load current for the SC4538. Use
the following equation to select the proper value:
R ISET = 230 × V ISET /I LOAD
where
V ISET = 0.5V (typ).
?
?
?
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.
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC4539 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:High Effi ciency Boost Converter for up to 6 LEDS |
| SC4539_08 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:High Effi ciency Boost Converter for up to 6 LEDS |
| SC4539EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:High Effi ciency Boost Converter for up to 6 LEDS |
| SC4539ULTRT | 功能描述:IC LED DRIVR CONST CURRENT 8MLPD RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| SC453EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Portable, VID Programmed Single Phase Power Supply Controller |
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