参数资料
型号: SC4540ULTRT
厂商: Semtech
文件页数: 13/15页
文件大小: 0K
描述: IC LED DRIVR CONST CURRENT 8MLPD
标准包装: 1
恒定电流:
拓扑: PWM,升压(升压)
输出数: 1
内部驱动器:
类型 - 主要: 背光
类型 - 次要: 白色 LED
频率: 680kHz ~ 920kHz
电源电压: 2.8 V ~ 12 V
输出电压: 5 V ~ 38 V
安装类型: 表面贴装
封装/外壳: 8-UFQFN 裸露焊盘
供应商设备封装: 8-UMLP
包装: 标准包装
工作温度: -40°C ~ 85°C
其它名称: SC4540ULTRTDKR
SC4540
Applications Information (continued)
Application Circuit for Alternate Input voltages
The typical applications circuit for the SC4540 is shown in
Figure 2. The performance data and specifications included
in this document are for the typical application circuit
(Figure 2). The SC4540 can be used with input voltages
lower than 4.5V (see Figure 3). The Inductor, L1, will need
to be adjusted to allow proper operation for input volt-
ages between to 2.8V to 5.5V. The SC4538 datasheet
should be consulted for the performance of the lower
input voltage circuit.
L1
5 6 μ H
D
1 μ F
L1
2 2 μ H
D
C O UT
4 .5 to 1 2 V
IN
LX
OU T
C O UT
2 .8 V to 5 .5 V
IN
LX
OU T
1 μ F
C IN
2.2 μ F
SC 4540
C IN
2.2 μ F
SC 4540
E n a b le a n d
PWM
d im m in g
C C OM P
47nF
R IS E T
R C OM P
1 .2 7 k Ω
EN
IS E T
COMP
E n a b le a n d
PWM
d im m in g
C COM P
47nF
R IS E T
R C OM P
1 .2 7 k Ω
EN
IS E T
C OMP
BL
BL
GN D
Figure 2 — Typical Application Circuit
GN D
Figure 3 — Low Input Voltage Application Circuit
13
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