- 您现在的位置：买卖IC网 > PDF目录20908 > SP6682EU-L/TR (Exar Corporation)IC LED DRIVER WHITE 10MSOP PDF资料下载
参数资料
| 型号： | SP6682EU-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 6/13页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER WHITE 10MSOP |
| 标准包装： | 2,500 |
| 拓扑： | PWM，升压（升压），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： | 420kHz ~ 780kHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
S P 6 6 8 2
H i g h E f f i c i e n c y W h i t e L E D C h a r g e P u m p R e g u l a t o r
THEORY OF OPERATION
cycle-by-cycle regulation ensures
mode change occurs during cycles.
that
no
I OUT =
O VERVIEW
The SP6682 is a current regulated charge
pump ideal for converting a Li-Ion battery
input for driving white LEDs used in back-
lighting color displays, Cell Phone Camera
Flash, PDAs, digital cameras and MP3 players.
The SP6682’s proprietary AutoBoost feature
enables the IC to automatically trans-ition
from X1.5 boost mode to X2 boost mode
based on battery input voltage for optimal
efficiency and performance. The SP6682 is
able to efficiently drive up to six 20mA white
LEDs in parallel and maintain a constant
brightness over a very wide operating voltage
range (2.7V to 5.5V). The SP6682 operates
with an internal 600kHz clock, enabling the
use of small external components. Other
features of SP6682 include PWM dimming
control as well as complete input/out
disconnect in shutdown. In shutdown mode
the IC draws less than 1.5 μ A current. The
output regulation is achieved by sensing the
voltage at the feedback pin and modulating
the switcher between the charge pump and
output capacitor.
O PERATION
The SP6682 regulated charge pump block
diagram consists of four main blocks (Voltage
Reference, Mode Control, Clock Manager,
Start-up and Charge-Pump Switches) and two
comparators (V MODE Comparator and V OUT
Comparator).
Voltage Reference.
This block provides the 306mV and 1.25V
reference voltages needed for the two
comparators.
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 selec-tion outputs to the x2 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
Clock Manager
An internal 600 kHz clock is generated in this
block. Depending on the mode control, the
appropriate clock phasing is generated here
and sent to the start-up and charge-pump
switches block.
Start-up and Charge Pump Switches
During start-up, until the reference is
established, this block keeps the charge pump
inactive. During this period the output stays
floating, and by consequence the charge pump
drivers are now referenced to VOUT.Charging
of the output will occur (e.g. when VIN is
ramped up to 4.2V, VOUT ramps only up to
about 3V), but not to the value of
VIN,protecting the White LEDs from
experiencing high input voltages. Another
important operation of this block is the
PWM/EN dim-ming control, which is
implemented in the delay of each pump driver,
so that the enable high pulse width is
proportional to the delay of the individual
pump switches.
V OUT Comparator and Output Control
A 306mV reference voltage is compared to
feedback output voltage to control the
VOUTneeded for the application. Output
current is set by a bias resistor from FB pin to
GND pin chosen by the relationship:
V FB
R FB
where V FB = 306mV.
C ONFIGURING T HE SP6682 A S V OLTAGE
O R C URRENT S OURCE
The white LED load configuration used by
customers can be discrete white LEDs or a
white LED module. Inside the white LED
module, there may or may not be resistors in
series with the white LEDs. According to the
different application requirements, the SP6682
can be configured as either a voltage source or
a current source to provide solutions for these
? 2009 Exar Corporation
6/13
Rev. 2.0.0
相关PDF资料 |
PDF描述 |
|---|---|
| NKE0515DC | CONV DC/DC 1W 5VIN 15V DIP SGL |
| PFC375-1028FM | SINGLE OUTPUT 375W 28V WITH FAN |
| REC5-0515SRW/H/B/SMD-R | CONV DC/DC 5W 4.5-9VIN 15VOUT |
| 4016-OFF-WHITE-1/2"X36YD | TAPE DBL SIDED FOAM 1/16 X 1/2" |
| PFC375-4200 | MULT-OUT 375W 24V, 5V, 12V, 12V |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6682UEB | 功能描述:电源管理IC开发工具 Eval Board for SP6682U Series RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| SP6683 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Power LED Driver for Parallel Configuration |
| SP6683EB | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6683ER | 制造商:Exar Corporation 功能描述:Driver, Other |
| SP6683ER/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 |
发布紧急采购，3分钟左右您将得到回复。