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参数资料
| 型号： | SP6683ER-L |
| 厂商： | Exar Corporation |
| 文件页数： | 6/14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 |
THEORY OF OPERATION
General Overview
The SP6683 is a current regulated charge pump
ideal for converting a Li-Ion battery input for
driving white LEDs used in camera flash or
backlighting color displays in cellular phones,
PDAs, digital cameras and MP3 players. The
SP6683 is able to efficiently drive one 200mA
Flash LED or up to eight 20mA white LEDs in
parallel and maintain a constant brightness over
a very wide operating voltage range (2.7V to
5.5V). The SP6683 operates with an internal
1.2MHz clock, enabling the use of small exter-
nal components. Other features of SP6683 in-
clude PWM dimming control as well as com-
plete input/output disconnect in shutdown. In
shutdown mode the IC typically draws 500nA
current. The output regulation is achieved by
sensing the voltage at the feedback pin and
modulating the switch between the charge pump
and output capacitor.
Theory of Operation
The SP6683 regulated charge pump block dia-
gram consists of four main blocks (Voltage
Reference, Mode Control, Clock Manager, Start-
up and Charge-Pump Switches) and two com-
parators (V MODE Comparator and V OUT Com-
parator).
1) Voltage Reference. This block provides the
315mV and 1.25V reference voltages needed
for the two comparators.
2) Mode Control. An external voltage divider
connected to the V MODE pin will define an input
voltage to the mode comparator which sets the
logic state of the mode selection outputs to the
X1 or X1.5 modes. V MODE is compared to a
1.25V bandgap voltage. For example, if one
makes a 158K/100K divider, the mode will
change at 2.58 x 1.25 V = 3.23V. A comparator-
based cycle by cycle regulation ensures that no
mode change occurs during cycles.
3) Clock Manager. An internal 1.2MHz clock
is generated in this block. Depending on the
mode control, the appropriate clock phasing is
generated here and sent to the startup and charge
pump switches block.
4) V OUT Comparator & Output Control. A
315mV reference voltage is compared to feed-
back voltage to control the V OUT needed for the
application. Output current is set by a bias
resistor from the FB pin to the GND pin chosen
by the relationship:
I OUT = V FB
R FB
where V FB = 315mV.
Date: 3/31/06 RevG
SP6683 1X/1.5X Charge Pump LED Driver for Flash or Backlight
6
? 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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