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参数资料
| 型号： | SP6656EB |
| 厂商： | Exar Corporation |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP6656 |
| 标准包装： | 1 |
| 系列： | * |
APPLICATION INFORMATION
Output Voltage Ripple Frequency
( V IN - V OUT )
F LP ≈
An important consideration in a power sup-
ply application is the frequency value of the
output ripple. Given the control technique of
the SP6656 (as described in the operations
section), the frequency of the output ripple
will vary when in light to moderate load in
the discontinuous or PFM mode. For mod-
erate to heavy loads greater than about
100mA inductor current ripple, (for the typi-
cal 10 μ H inductor application on 100mA is
half the 200mA inductor current ripple), the
output ripple frequency will be fairly con-
stant. From the operations section, this maxi-
mum loop frequency in continuous conduc-
tion mode is
1 V OUT
* *
K ON V IN
Data for loop frequency, as measured from
output voltage ripple frequency, can be found
in the typical performance curves.
Layout Considerations
Proper layout of the power and control circuits
is necessary in a switching power supply to
obtain good output regulation with stability
and a minimum of output noise. The SP6656
application circuit can be made very small and
reside close to the IC for best performance
and solution size, as long as some layout
techniques are taken into consideration. To
avoid excessive interference between the
SP6656 high frequency converter and the
other active components on the board, some
rules should be followed. Refer to the typical
application schematic on page 1 and the
sample PCB layout shown in the following
figures to illustrate how to layout a SP6656
power supply.
Avoid injecting noise into the sensitive part of
circuit via the ground plane. Input and output
capacitors conduct high frequency current
through the ground plane. Separate the con-
trol and power grounds and connect them
together at a single point. Power ground
plane is shown in the figure titled PCB top
sample layout and connects the ground of the
C OUT capacitor to the ground of the
C IN capacitor and then to the PGND pin 10.
The control ground plane connects from pin 9
GND to ground of the C VIN capacitor and the
R I ground return of the feedback resistor.
These two separate control and power ground
planes come together in the figure titled PCB
top sample layout where SP6656 pin 9 GND
is connected to pin 10 PGND.
Power loops on the input and output of the
converter should be laid out with the shortest
and widest traces possible. The longer and
narrower the trace, the higher the resistance
and inductance it will have. The length of
traces in series with the capacitors increases
its ESR and ESL and reduces their effective-
ness at high frequencies. Therefore, put the
1 μ F bypass capacitor as close to the V IN and
GND pins of the converter as possible, the
10 μ F C IN close to the P VIN pin and the 10 μ F
output capacitor as close to the inductor as
possible. The external voltage feedback net-
work R F , R I , R S and feedforward capacitor C F
should be placed very close to the FB pin. Any
noise traces like the LX pin should be kept
away from the voltage feedback network and
separated from it by using power ground
copper to minimize EMI.
Date: 3/6/06
SP6656, 400mA Synchronous Buck Regulator with Dynamically Adjustable Voltage Output
14
? Copyright 2006 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6656ER | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Efficiency 400mA Synchronous Buck Regulator with Bit Programmable Output |
| SP6656ER/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Efficiency 400mA Synchronous Buck Regulator with Bit Programmable Output |
| SP6656ER3 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Efficiency 400mA Synchronous Buck Regulator with Dynamically Adjustable Voltage Output |
| SP6656ER3-L | 功能描述:DC/DC 开关控制器 High Eff. 400mA Sync. Buck Reg RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| SP6656ER3-L/TR | 功能描述:DC/DC 开关控制器 High Eff 400mA Synchronous RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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