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参数资料
| 型号： | SP7685ER-L |
| 厂商： | Exar Corporation |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR PWM DIMMING 10DFN |
| 标准包装： | 1 |
| 拓扑： | PWM，降压（降压），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： | 高亮度 LED（HBLED），白色 LED |
| 频率： | 2.4MHz |
| 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 |
| 其它名称： | 1016-1406 |
COMPONENT SELECTION
The SP7685 charge pump circuit requires
three capacitors: 10 μ F input, 10 μ F output
and 1 μ F fly capacitor are typically recom-
mended. 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 sur-
face mount ceramic for low lead inductance
necessary at the 2.4MHz switching frequency
of the SP7685 and to obtain low ESR, which
improves bypassing on the input and output
and improves output voltage drive by reduc-
ing output resistance. Ceramic capacitors
with X5R or X7R temperature grade are
recommended for most applications. A se-
lection of recommended capacitors is in-
cluded in Table 1 below.
RESISTOR SELECTION
The sense resistor R SENSE is determined by
the value needed in the Torch mode for the
desired output current by the equation:
R SENSE = V FB / I OUT where V FB = 50mV (Torch
Mode)
Once the R SENSE resistor has been selected
for Torch mode, the V FB voltage can be
selected for Flash mode using the following
equation:
V FB = I OUT * R SENSE (Flash Mode) where I OUT is
for Flash Mode.
Manufacturer's Website
TDK: www.tdk.com
TDK: www.tdk.com
TDK: www.tdk.com
Murata: www.murata.com
Murata: www.murata.com
Murata: www.murata.com
Part Number
C1005X5R0J105M
C1608X5R0J475K
C2012X5R0J106M
GRM155R60J105KE19B
GRM188R60J475KE19
GRM21BR60J106KE19L
Capacitance/
Voltage
1uF/6.3V
4.7uF/6.3V
10uF/6.3V
1uF/6.3V
4.7uF/6.3V
10uF/6.3V
CapacitorSize/
Type/Thickness
0402/X5R/0.5mm
0603/X5R/0.9mm
0805/X5R/1.35mm
0402/X5R/0.55mm
0603/X5R/0.9mm
0805/X5R/1.35mm
ESR
@100kHz
0.03
0.02
0.02
0.03
0.02
0.02
Table 1: Recommended Capacitors
( 14uA ) * 5
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
P GND pin or to the thermal pad ground located
under the SP7685. The fly capacitor should
be located as close to the C1 and C2 pins as
possible. See typical circuit layout at the end
of this section for details on the recom-
mended layout.
To obtain low output ripple, a value of 10 μ F
is recommended for C OUT . For output cur-
rents of 500mA to 1.2A, the recommended
C FC fly capacitor value of 1 μ F should be
used. Output currents in Flash of 100mA to
400mA can use a 0.47 μ F C FC but a minimum
4.7 μ F C OUT is still needed.
Next, the R SET resistor can be selected for
Flash mode using the following equation:
V FB
R SET = Ω (Flash Mode)
For an example of 200mA Torch mode and
700mA Flash mode, the values R SENSE =
0.22 Ω , V FB = 155mV (Flash Mode), and R SET
=56K Ω are calculated. The power obtained
in the Flash mode would be:
P FLASH = V FB *I OUT = 155mV*700mA = 109mW.
The typical 0603 surface mount resistor is
rated 1/10 Watt continuous power and 1/5
Date: 6/20/06 Rev T
SP7685, 1.2A Buck/BoostCharge Pump LED Driver
9
? 2006 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP7685ER-L/TR | 功能描述:LED照明驱动器 1.2A BUCK/BOOST 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 |
| SP7686 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Constant Current Flash Driver in DFN 2mm x 3mm |
| SP7686A | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Constant Current Flash Driver in DFN 2mm x 3mm |
| SP7686A_07 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP7686AEB | 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 |
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