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参数资料
| 型号： | SP7686AER-L |
| 厂商： | Exar Corporation |
| 文件页数： | 12/16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
APPLICATIONS INFORMATION
CONT’D
The SP7686 charge pump circuit requires 3
capacitors: 10 μ F input, 2.2 μ F output and
0.22 μ F fly capacitor are typically
recommended. For the input capacitor, a value
of 10 μ F will help reduce input voltage ripple
for applications sensitive to ripple on the
battery voltage. All the capacitors should be
surface mount ceramic for low lead inductance
necessary at the 2.4MHz switching frequency
of the SP7686 and to obtain low ESR, which
improves bypassing on the input and output
and improves output voltage drive by reducing
output resistance. Ceramic capacitors with
X5R or X7R temperature grade are
recommended for most applications. A
selection of recommended capacitors is
included in Table 1 below.
The input and output capacitors should be
located as close to the V IN and V OUT pins as
possible to obtain best bypassing, and the
returns should be connected directly to the
PGND pin or to the thermal pad ground
located under the SP7686. The fly capacitor
should be located as close to the C1 and C2
pins as possible. See the RECOMMENDED
LAYOUT section for details on the
recommended layout.
To obtain low output ripple, a value of 2.2 μ F is
recommended for C OUT . For all output currents
the value for C FLY of 0.22 μ F is recommended.
For best regulation and low input current
ripple the input capacitor value of 10 μ F is
recommended. A smaller 4.7 μ F for Cin will
work but input voltage ripple will increase and
may effect regulation.
R ESISTOR S ELECTION FOR THE SP7686A
The 7686A part has fixed FB voltages in Torch
and Flash modes so the sense resistor R SENSE is
determined by the value needed in the Torch
or Flash mode for the desired output current
by the equation:
R SENSE =V FB /I OUT where V FB =60mV (Torch Mode)
R SENSE =V FB /I OUT where V FB =160mV(Flash Mode)
Once the R SENSE resistor has been selected for
one mode, the I OUT can be selected for the
other mode using the following equation:
I OUT = V FB / R SENSE
Using an example of Torch current of 180mA
and Flash current of 450mA, calculated R SENSE
for Torch is 0.06 /0.180 = 0.333 Ohms. Use a
standard value of 0.33 Ohms. I OUT for Flash
mode is 0.16/0.33 = 480mA
The power obtained in the Flash mode would
be:
P FLASH = V FB *I OUT = 160mV*480mA ~ 77mW.
The typical 0603 surface mount resistor is
rated 1/10 Watt continuous power and 1/5
Watt pulsed power, more than enough for this
application. For other applications, the P FLASH
power can be calculated and resistor size
selected. The R SENSE resistor is recommended
to be size 0603 for most applications. The
range of typical resistor values and sizes are
shown here in Table 2.
Manufacturers/
Website
TDK/www.tdk.com
TDK/www.tdk.com
TDK/www.tdk.com
TDK/www.tdk.com
TDK/www.tdk.com
Murata/www.murata.com
Murata/www.murata.com
Murata/www.murata.com
Murata/www.murata.com
Murata/www.murata.com
Part Number
C1005X5R0J224K
C1005X5R0J105K
C1608X5R0J225K
C1608X5R0J475K
C1608X5R0J107M
GRM155R60J224KE19D
GRM155R60J105KE19D
GRM188R60J225KE19D
GRM188R60J475KE19D
GRM188R60J106ME19D
Capacitance/
Voltage
0.22uF/6.3V
1uF/6.3V
2.2uF/6.3V
4.7uF/6.3V
10uF/6.3V
0.22uF/6.3V
1uF/6.3V
2.2uF/6.3V
4.7uF/6.3V
10uF/6.3V
Capacitor
Size/Type/Thickness
0402/X5R/0.55mm
0402/X5R/0.55mm
0603/X5R/0.9mm
0603/X5R/0.9mm
0603/X5R/0.9mm
0402/X5R/0.55mm
0402/X5R/0.55mm
0603/X5R/0.8mm
0603/X5R/0.8mm
0603/X5R/0.9mm
ESR at
100kHz
0.05
0.03
0.03
0.02
0.02
0.05
0.03
0.03
0.02
0.02
Table 1: Capacitor Selection
? 2010 Exar Corporation
12/16
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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