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参数资料
| 型号： | SP6683ER-L |
| 厂商： | Exar Corporation |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER WHITE 10DFN |
| 标准包装： | 121 |
| 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，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 700kHz ~ 1.5MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 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-DFN（3x3） |
| 包装： | 散装 |
| 工作温度： | -40°C ~ 85°C |
APPLICATION INFORMATION
Component Selection
The guideline for selecting divider resistors is as
follows. For high input voltage, the SP6683 will
work in X1 mode. When the input voltage drops
to V TH threshold voltage, it will switch to X1.5
mode automatically. The V TH threshold voltage
for mode change can be calculated by:
V TH = (V F + 0.315 + m ? I LED ? R OUT )
Where V F and m are the forward voltage and
number of the white LEDs, Rout is the output
resistance of the SP6683.
The equation for the voltage divider R 1 and R 2
with V MODE = 1.25V is:
V TH = 1.25V ? (1+R 1 /R 2 )
Which can be expressed as R 1:
R 1 = [ (V TH /1.25) - 1 ] R 2
Ceramic capacitors are recommended for their
inherently low ESR, which will help produce
low peak-to-peak output ripple, and reduce high
frequency spikes.
The fly capacitor controls the strength of the
charge pump. Selection of the fly capacitor is a
tradeoff between the output voltage ripple and
the output current capability. Decreasing the fly
capacitor will reduce the output voltage ripple
because less charge will be delivered to the
output capacitor. However, a smaller fly capaci-
tor leads to larger output resistance, thus de-
creasing the output current capability and the
efficiency of the circuit. Increasing the value of
the input and output capacitors could further
reduce the input and output ripple. For back-
lighting applications up to 80mA output current,
C IN = C OUT = 1 μ F is typically used. For appli-
cations with more than 80mA output current, for
example in Flash applications where Iout can be
as much as 200mA, C IN = C OUT = 2.2 μ F is
recommended. For peak performance, place all
capacitors as close to the SP6683 as possible.
For the typical SP6683 application, using V F =
3.6V, m = 8, I LED = 15mA, R OUT = 6 ? , V TH will
be 4.63V, Select R 2 = 100k ? , then R 1 = 270k ?
Refer to table 1 below for some suggested low
ESR capacitors.
SUGGESTED LOW ESR CAPACITORS
Manufacturers/ Website
TDK/www.tdk.com
TDK/www.tdk.com
Murata/www.murata.com
Murata/www.murata.com
Part Number
C1005X5R0J105M
C1608X5R0J225K
GRM155R60J105KE19B
GRM188R61A225KE34B
Capacitance/
Voltage
1uF/6.3V
2.2uF/6.3V
1uF/6.3V
2.2uF/6.3V
Capacitor
Size/Type/Thickness
0402/X5R/0.5mm
0603/X5R/0.9mm
0402/X5R/0.55mm
0603/X5R/0.9mm
ESR at
100KHz
0.03
0.02
0.03
0.02
Date: 3/31/06 RevG
SP6683 1X/1.5X Charge Pump LED Driver for Flash or Backlight
10
? Copyright 2006 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6683ER-L/TR | 功能描述:LED照明驱动器 High Power Parallel Configuration RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| SP6683EU | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Power LED Driver for Parallel Configuration |
| SP6683EU/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Power LED Driver for Parallel Configuration |
| SP6683UEB | 功能描述:LED 照明开发工具 High Power LED Drvr for Parallel Config RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| SP6685 | 制造商:EXAR 制造商全称:EXAR 功能描述:700mA Buck/Boost Charge Pump LED Driver |
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