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参数资料
| 型号： | QPI-4L |
| 厂商： | Vicor Corporation |
| 元件分类： | DC/DC变换器 |
| 英文描述： | 7 Amp Active EMI Filter for 48 V DC Bus |
| 中文描述： | 7安培有源EMI滤波器的48伏直流母线 |
| 文件页数： | 3/8页 |
| 文件大小： | 143K |
| 代理商： | QPI-4L |
Picor Corporation www.picorpower.com
QPI-4L Data Sheet Rev. 3.0 Page 3 of 8
Applications Information
The QPI-4 is an active EMI filter providing conducted
common-mode and differential-mode attenuation
from 150 kHz to 30 MHz. The QPI-4 attenuates noise at
all frequencies covered by EN55022. Designers should
be aware that to select and qualify an EMI filter they
must test the filter in their equipment under the set up
and conditions specified in the EMI standards that they
are trying to meet.
Filter performance is highly dependent on several
factors and cannot be derived from the attenuation
curves shown in Figure 2 alone. Performance is a
complex function of filter element impedances and
noise source impedances, which vary in magnitude and
phase over the frequency spectrum. Measurements
should be made in consultation with in-house
compliance testing or an independent EMI test facility.
Test Example
Figures 3 and 4 show the before and after plots of a
DC-DC converter noise profile to demonstrate the
performance of the QPI-4. The plots were taken using
the standard measurement technique and set up defined
in CISPR22. The results show the total noise spectrum
for a standard DC-DC converter under load compared
to the EN55022 Class B Quasi-peak detection limit.
The resulting plot in Figure 4 shows the QPI-4 is
effective in reducing the total conducted noise
spectrum measured pre-filter to well below the
EN55022 Class B Quasi-peak detection limit.
Layout and Circuit
Application of the QPI-4 requires PCB layout practices
similar to those used with passive EMI filters. The circuit
in Figure 6 and the PCB layout in Figures 9 & 10 should
be used as a design guide to ensure successful
application of the QPI-4. Refer to the application note
QPI- AN1 for additional PCB layout recommendations.
Note: For optimum performance of the QPI-1 it is critical
to connect the QPI-1 Shield Plane (pins 5 & 6) to the
converter EMI Shield Plane (common point of C1-C4 "Y"
capacitors) thru RY as shown in Figure 6. If the safety
earth-ground connection (chassis or case) is connected in
the power conversion section of the PCB it should be at
the input bus of the QPI-1 Shield Plane, shown as the
optional connection in Figure 6. Connecting the converter
EMI shield plane directly to chassis ground may degrade
the QPI-1 attenuation performance. The typical value for
RY is 10 Ohms. The recommended part is a 5% tolerance
SMT1206 or similarly rated 0.25 W through-hole resistor.
Some systems may require the converter positive or
negative input or an output "terminal" to be connected to
PE (Protective Earth) ground for safety or other
considerations. When using the QPI in this situation this
"terminal" must be connected to the converter shield
plane created in the PCB layout under the converter.
Because the PE earth path may pass excessive current
under a fault condition the resistance of this path may be
limited to a low resistance value. To meet the resistance
requirement without degrading filter performance Ry can
be replaced by a 4.7uH inductor rated for the fault current
condition maintaining low power dissipation during a
fault until the protection device clears.
Figure 3 – Conducted EMI profile of a DC-DC Converter
without filter.
Figure 4 – Conducted EMI profile of a DC-DC Converter
with QPI-4.
相关PDF资料 |
PDF描述 |
|---|---|
| QPI-5-EVAL1 | Evaluation Board for Active EMI Filters |
| QPI-6-EVAL1 | Evaluation Board for Active EMI Filters |
| QPO-1L | Output Ripple Attenuation SiP |
| QPO-1Q | Output Ripple Attenuation SiP |
| QPO-2EVAL1 | Evaluation Board for QPO-2 Active Output Filter |
相关代理商/技术参数 |
参数描述 |
|---|---|
| QPI-4LZ | 功能描述:FILTER ACTIVE EMI 48V 7A LGA RoHS:是 类别:集成电路 (IC) >> 接口 - 滤波器 - 有源 系列:Picor®, QUIETPOWER® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1,000 系列:- 滤波器类型:连续时间，带通低通 频率 - 截止或中心:150kHz 滤波器数:4 滤波器阶数:8th 电源电压:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) |
| QPI-5-CB1 | 功能描述:EVALUATION QPI-5LZ DOSA STYLE RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:Picor®, QUIETPOWER® 标准包装:1 系列:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源 |
| QPI-5-EVAL1 | 功能描述:EVALUATION BOARD FOR QPI-5 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:Picor®, QUIETPOWER® 标准包装:1 系列:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源 |
| QPI-5L | 制造商:POWERBOX 制造商全称:Powerbox 功能描述:ACTIVE EMI FILTER |
| QPI-5LZ | 功能描述:FILTER 24V 14A ACTIVE EMI RoHS:是 类别:集成电路 (IC) >> 接口 - 滤波器 - 有源 系列:Picor®, QUIETPOWER® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1,000 系列:- 滤波器类型:连续时间，带通低通 频率 - 截止或中心:150kHz 滤波器数:4 滤波器阶数:8th 电源电压:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) |
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