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参数资料
| 型号： | SC4540ULTRT |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 920 kHz SWITCHING FREQ-MAX, DSO8 |
| 封装： | 2 X 2 MM, ROHS COMPLIANT, MLPD-8 |
| 文件页数： | 4/15页 |
| 文件大小： | 281K |
| 代理商： | SC4540ULTRT |
12
Applications Information (continued)
SC4540
Diode Selection
A Schottky diode with a reverse voltage of 60V and a
forward current rating of 1A should be used with this
device for optimum performance. The ST Microelectronics
STPS05602 is a recommended diode for this application.
Selection of Other Components
R
ISET
sets the maximum load current for the SC4540. Use
the following equation to select the proper value:
R
ISET
= 230×V
ISET
/I
LOAD
where
V
ISET
= 0.5V (typ).
Refer to Figure 1 for selecting values for other current set-
tings. Note that the error increases as the desired I
BL
current decreases.
1
10
100
1
10
100
RISET (kΩ )
RISET
Typical
C urrent
T olerance
I BL
(m
A
)
Figure 1 – Set Resistor Value Selection Graph
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 4.
The following design rules are recommended:
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.
Figure 4– Layout
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC4541SKTRT | 功能描述:IC LED DRVR BACKLIGHT SOT23-6 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 |
| SC4541ULTRT | 制造商:Semtech Corporation 功能描述:SINGLE WIRE BACKLIGHT DRIVER |
| SC454MLTRT | 制造商:Semtech Corporation 功能描述:PWM Controller 32-Pin MLP T/R 制造商:Semtech Corporation 功能描述:SINGLE PHASE PWR SUPPLY CONTLR |
| SC4560 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:相机闪光灯控制IC |
| SC457 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Single-Phase Single Chip Vcore Power Supply |
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