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参数资料
型号： SP7685EB
厂商： Exar Corporation
文件页数： 9/12页
文件大小： 0K
描述： EVAL BOARD FOR SP7665
标准包装： 1
系列： *
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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参数描述
SP7685ER 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual
SP7685ER-L 功能描述:LED照明驱动器 1.2A Bck/Bst Charge Pump LED Driver 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
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
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