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参数资料
| 型号： | SP6683ER-L |
| 厂商： | Exar Corporation |
| 文件页数： | 9/14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
R =
In this application, the bias resistor can be se-
lected by:
V FB
B
I LED (TOTAL)
where I LED(TOTAL) is the total operating current
of all the white LEDs.
To use SP6683 as a voltage source for fixed
voltage applications, a voltage divider is need to
program the output voltage, as shown in the figure
above. The output voltage is set by the ratio of
the two resistors and the feedback control volt-
age as shown by:
V OUT = ( 1 + R 5 ) ? V FB
R 6
Brightness Control Using PWM
Dimming control can be achieved by applying a
PWM control signal to the EN/PWM pin. The
brightness of the white LEDs is controlled by
increasing and decreasing the duty cycle of the
PWM signal. While operating frequency range
is from 60Hz to 700Hz, the recommended maxi-
The SP6683-03ER has the discharge MOSFET
disabled ensuring that the output node is at high
impedance during shutdown. This can be useful
if the system is feeding LED current from an-
other source while the SP6683 is in shutdown.
The SP6683-LV offers a lower reference volt-
age that allows to reduce efficiency loss occur-
ring in the current sense resistor. This part is
ideal for driving single LEDs for Flash applica-
tions.
Reducing Component Count
It is possible to reduce the number of external
components by shorting pins 2 & 9 and omitting
the flying capacitor. In this mode, the charge
pump operates in a "quasi" doubler mode. This
reduces efficiency but does allow for one less
external capacitor. This circuit is recommended
only when Input and Output Voltages have
similar range, which is very common when
driving white LEDs from a Li-Io battery.
mum brightness frequency range is from 60Hz
to 200Hz. A repetition rate of at least 60Hz is
required to prevent flicker.
Vin
2.7V~4.2V
C1
2.2uF
1 Vout C2P 10
2 C1P C1N 9
SP6683
3 Vin GND 8
4 Vmode
C2N 7
5 FB
EN/PWM 6
C3
1uF
6.3V/0603
LED1
C4
2.2uF
6.3V/0603
Io=Vfb/Rb
6.3V/0603
EN/PWM
Rb
1.5 ?
Three Options for Optimization
The SP6683 family includes three options that
allow the user to optimize the LED driving
circuit. The SP6683 includes an on-board dis-
charge switch that ensures that V OUT is com-
pletely discharged in shutdown. This feature is
very useful in systems using PWM dimming,
when the SP6683 is periodically turned on and
off. The discharge switch ensures that the fall-
ing and rising edges of the LED current have
similar durations.
Flying Cap Removed
1% / 0603
Date: 3/31/06 RevG
SP6683 1X/1.5X Charge Pump LED Driver for Flash or Backlight
9
? 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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