收藏本站
NPH25S Series
Isolated 25W Single Output DC/DC Converters
EMC FILTERING AND SPECTRA
FILTERING
The module includes a basic level of ?ltering, suf?cient for many applications. Where lower noise levels are desired, ?lters can easily be added to achieve any required
noise performance.
A DC/DC converter generates noise in two principle forms: that which is radiated from its body and that conducted on its external connections. There are three separate
modes of conducted noise: input differential, output differential and input-output.
This last appears as common mode at the input and the output, and cannot therefore be removed by ?ltering at the input or output alone. The ?rst level of ?ltering is to
connect a capacitor between input and output returns, to reduce this form of noise. It typically contains high harmonics of the switching frequency, which tend to appear
as spikes on surrounding circuits. The voltage rating of this capacitor must match the required isolation voltage. (Due to the great variety in isolation voltage and required
noise performance, this capacitor has not been included within the converter.)
Input ripple is a voltage developed across the internal Input decoupling capacitor. It is therefore measured with a de?ned supply source impedance. Although simple series
inductance will provide ?ltering, on its own it can degrade the stability. A shunt capacitor is therefore recommended across the converter input terminals, so that it is fed
from a low impedance.
If no ?ltering is required, the inductance of long supply wiring could also cause a problem, requiring an input decoupling capacitor for stability. An electrolytic will perform
well in these situations. The input-output ?ltering is performed by the common-mode choke on the primary. This could be placed on the output, but would then degrade the
regulation and produce less bene?t for a given size, cost, and power loss.
Radiated noise is present in magnetic and electrostatic forms. The latter is suppressed by the metal case, which is connected to the output return, typically a zero-volt
point. Thanks to the small size of these units, neither form of noise will be radiated “ef?ciently”, so will not normally cause a problem. Any question of this kind usually
better repays attention to conducted signals.
EMC FILTER AND VALUES TO OBTAIN SPECTRA AS SHOWN
Component reference
C1
C2
C3
C4
L1
L2
L3
NPH25S2403
NPH25S2405
NPH25S2412
NPH25S2415
NPH25S4803
NPH25S4805
NPH25S4812
NPH25S4815
10μF 100V
10μF 100V
10μF 100V
10μF 100V
10μF 100V
10μF 100V
10μF 100V
10μF 100V
2.2μF 63V
2.2μF 63V
2.2μF 63V
2.2μF 63V
Not required
Not required
Not required
Not required
47μF 63V
47μF 63V
Not required
47μF 63V
Not required
Not required
Not required
Not required
10μF 25V
10μF 25V
10μF 25V
10μF 25V
10μF 25V
10μF 25V
10μF 25V
10μF 25V
MPS 18R333C
33μH 2A
MPS 18R333C
33μH 2A
MPS 18R333C
33μH 2A
MPS 18R333C
33μH 2A
MPS 18R104C
100μH 1.2A
MPS 18R104C
100μH 1.2A
MPS 18R104C
100μH 1.2A
MPS 18R104C
100μH 1.2A
4.7μH
10μH
MPS 49330C
33μH 2.5A
MPS 18R333C
33μH 2.00A
4.7μH
10μH
MPS 49330C
33μH 2.5A
MPS 18R333C
33μH 2.00A
C1, C2 & C4 : Electrolytic capacitors
C3 : Polyester or ceramic capacitor
EMC Spectra red limit line is EN 55022 curve B Quasi-peak average limit.
www.murata-ps.com/support
KDC_NPH25S.H01 Page 5 of 8
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
NPVV567M002R0003 CAP NIOB OXIDE 560UF 2.5V 2924
NPX20S48033DC CONV DC/DC 6A 48VIN 3.3VOUT SGL
NR10050T680M INDUCTOR WOUND 68UH 1.7A SMD
NR6012T101M INDUCTOR 100UH 350MA 20% SMD
NRS5012T3R3MMGF INDUCTOR POWER 3.3UH 1.45A SMD
NS10155T4R7NNA INDUCTOR POWER 4.7UH 30% SMD
NTA1212MC CONV DC/DC 1W 12VIN 12V DL 1KV
NTE0505MEC CONV DC/DC SM 1W 5VIN 5VOUT SGL
相关代理商/技术参数
NPH25S4803EI 功能描述:DC/DC转换器 25W 48V TO 3.4V ADJ RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:
NPH25S4803EIC 功能描述:DC/DC转换器 48Vin 3.4Vout 7.3A Isolated 25W RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:
NPH25S4803I 功能描述:DC/DC转换器 25W 48VIN 3.4VOUT RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:
NPH25S4803IC 功能描述:DC/DC转换器 25W 48VIN 3.4VOUT Single Output RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:
NPH25S4805Ei 制造商:Murata Power Solutions 功能描述:DC/DC CONVERTER 25W 5V
NPH25S4805EIC 功能描述:DC/DC转换器 48Vin 5.1Vout 5A Isolated 25W RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:
NPH25S4805I 功能描述:DC/DC转换器 25W 48VIN 5.1VOUT RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:
NPH25S4805IC 功能描述:DC/DC转换器 25W 48VIN 5.1VOUT Single Output RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: