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| 型号： | EL1848IWT-T7 |
| 厂商： | Intersil |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT TSOT-8 |
| 标准包装： | 3,000 |
| 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： | 800kHz ~ 1.2MHz |
| 电源电压： | 2.6 V ~ 13.2 V |
| 输出电压： | 14V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 薄型，TSOT-23-8 |
| 供应商设备封装： | TSOT-23-8 |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
EL1848
For the same inductance, higher overall efficiency can be
obtained by using lower DCR inductor.
However, placing LEDs into series/parallel connection can
give higher efficiency as shown in the efficiency curves. One
of the ways to ensure the brightness uniformity is to pre-
85
EFFICIENCY vs I O
V IN =3.3V FOR
DIFFERENT L
screen the LEDs.
PCB Layout Considerations
83
L=33μH
L=22μH
L=15μH
The layout is very important for the converter to function
properly. Power Ground ( ) and Signal Ground ( ) should
be separated to ensure the high pulse current in the power
81
L=10μH
ground does not interference with the sensitive signals
connected to Signal Ground. Both grounds should only be
79
77
5
10
15
L=Coilcraft
LPO1704 SERIES
1mm HEIGHT
20 25
30
connected at one point right at the chip. The heavy current
paths (V IN -L-L X pin-PGND, and V IN -L-D-C 2 -PGND) should
be as short as possible.
The trace connected to the CS pin is most important. The
I O (mA)
FIGURE 20. EFFICIENCY OF DIFFERENT INDUCTANCE
(4 LEDs IN A SERIES)
The diode should be Schottky type with minimum reverse
voltage of 20V. The diode's peak current is the same as
inductor's peak current, the average current is I O , and RMS
current is:
current sense resister R 1 should be very close to the pin
When the trace is long, use a small filter capacitor close to
the CS pin.
The heat of the IC is mainly dissipated through the PGND
pin. Maximizing the copper area around the plane is
preferable. In addition, a solid ground plane is always helpful
for the EMI performance.
The demo board is a good example of layout based on the
I DRMS =
I LAVG × I O
principle. Please refer to the EL1848 Application Brief for the
layout.
Ensure the diode's ratings exceed these current
requirements.
White LED Connections
One leg of LEDs connected in series will ensure the
uniformity of the brightness. 14V maximum voltage enables
3 LEDs can be placed in series.
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL1848IWT-T7A | 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-8 RoHS:否 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，切换式电容器（充电泵） 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:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
| EL1848IWTZ-T7 | 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-8 RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，切换式电容器（充电泵） 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:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
| EL1848IWTZT7A | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:White LED Step-Up Regulator |
| EL1848IWTZ-T7A | 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-8 RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，切换式电容器（充电泵） 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:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
| EL1848IY | 功能描述:IC LED DRIVR WHITE BCKLGT 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，切换式电容器（充电泵） 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:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
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