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参数资料
| 型号： | SP7686AER-L |
| 厂商： | Exar Corporation |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR CONST CURRENT 8DFN |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压），升压（升压），切换式电容器（充电泵） |
| 输出数： | 1 |
| 类型 - 主要： | 闪灯/白光，通用 |
| 类型 - 次要： | 高亮度 LED（HBLED），白色 LED |
| 频率： | 2MHz ~ 2.8MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（3x2） |
| 包装： | 散装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | 1016-1407 |
S P 7 6 8 6 / S P 7 6 8 6 A
C o n s t a n t C u r r e n t F l a s h D r i v e r i n D F N 2 m m x 3 m m
Part Reference
Value
Tolerance
Size
Manufacturers
RSENSE
RSENSE
RSENSE
RSENSE
RSENSE
RSENSE
RSENSE
0.22ohms
0.27ohms
0.33ohms
0.39ohms
0.47ohms
0.56ohms
0.68ohms
1%
1%
1%
1%
1%
1%
1%
or
or
or
or
or
or
or
5%
5%
5%
5%
5%
5%
5%
0603
0603
0603
0603
0603
0603
0603
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
or
or
or
or
or
or
or
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Table 2: Resistor Selection
R ESISTOR S ELECTION FOR SP7686
The SP7686 part uses an internal 5 bit DAC to
set the LED current. The DAC input is at the
CTRL pin. The user inputs a pulse train of up
to 1MHz to set the LED current. The DAC sets
the feedback voltage point from 58mV to
350mV in 9.7mV steps. The LED current is
determined by the equation:
I LED = V FB /R SENSE
The curves below show the feedback and LED
currents for the CTRL pin pulse count and
standard R SENSE resistor values.
After the desired count is reached the CTRL
input must remain high to hold the count. If
the CTRL pin goes low for more than 200 μ s
the part will shutdown. See the timing
diagrams in the Typical Performance
Characteristics. The first pulse turns on the
SP7686. The first pulse needs to occur at
least 600 μ sec after V IN is applied in order to
activate after the power on reset (POR). The
second pulse resets the DAC to 0. The timing
between the first and second pulse needs to
be 25 μ sec typical to as long as 75 μ sec. After
the second pulse the feedback voltage
remains at ground. The third pulse sets the
feedback voltage to 58mV. Subsequent pulses
set the feedback voltage in 9.7mV steps as
shown previously in the Typical Performance
Characteristics.
? 2010 Exar Corporation
13/16
Rev. 2.1.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP7686AER-L/TR | 功能描述:LED照明驱动器 500mA PROG CHARGE PUMP LED DRVR 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 |
| SP7686EB | 功能描述:电源管理IC开发工具 500mA Programmable Charge Pump LED Drvr 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 |
| SP7686ER | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP7686ER-L | 功能描述:LED照明驱动器 Driver in 2x3 DFN 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 |
| SP7686ER-L/TR | 功能描述:LED照明驱动器 500mA PROG CHARGE PUMP LED DRVR 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 |
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