【应用】贴片桥式整流器CBR1-D020S峰值重复电压可达200V,适合802.3at标准PoE整流桥的应用要求
PoE技术通过网线的空闲线或信号线为以太网终端设备提供电源,可以不改变现有的网络结构和增加额外的电缆,既节省空间又节省成本,在实际应用中日益广泛。由于大功率的以太网设备的接入,如带云台的视频监控等, PoE业界所采用的IEEE 802.3af标准难以满足实际应用要求。新的PoE 标准802.3at规定每个端口的输出功率可在30W以上,大幅的拓宽了PoE的应用范围。该标准规定PoE标准供电系统直流电压在50V~57V,典型值50V;典型工作电流10~600mA,受电设备PD支持Class4分级。
图1. PoE供电拓扑图
功率的提升, PoE系统设备部件也需要相应的调整,如线缆、DC\DC变换器、桥式整流器等。50V直流通过RJ45接入受电侧,经网络变压器进行电压信号的分频后,分离出直流电压送入到桥式整流电路进行整流滤波,向后级PD控制器提供稳定可靠的电压,如图2所示(注Si3406为PD控制器)。桥式整流在此处的主要作用防止供电端网口极性反接。根据器件一般的选型要求,桥式整流器额定电压应该在输入电压3倍以上,电流应大于最高供电电流1.5倍左右,故需要选择耐压在150V以上,电流900mA左右的桥式整流器。在此处的应用中,笔者推荐Central Semiconductor(中央半导体)公司生产的贴片桥式整流器CBR1-D020S,如图3所示,该整流桥具有高耐压、高电流能力、低漏电流的优点,重复峰值反向电压高达200V,平均前向电流可达1A,满足在802.3at标准中PoE整流桥的应用要求。
图2. 桥式整流器为PD控制器提供电源
CBR1-D020S最高重复峰值反向电压VRRM、最高直流阻断电压VR均为200V,高于802.3at规定的最高工作电压(57V)3倍以上,满足选型要求;最高有效值电压140V,远高压PoE最高有效值电压(注:PoE 电压为直流,故有效值电压等于供电电压),宽的电压裕量能有效的保障器件的可靠性。最高峰值正向浪涌电流IFSM达到50A,能有效的防止开机浪涌或雷击浪涌的损坏。采用SMDIP封装,外表采用耐用的环氧树脂塑壳,并采用玻璃钝化技术,大大提高了整流桥的电气性能和可靠性。在VRRM电压下,漏电流仅10uA,有利于减少设备发热。工作和存储结温范围-65~+150℃,达到军工级温度等级的水平,能在苛刻的环境中应用。
图3. 采用SMDIP的CBR1-D020S整流桥
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【应用】Central Semiconductor的CBRDFSH系列肖特基桥式整流器可增强PoE设备
每个PoE PD都需要一个有效的桥式整流器输入级来校正电压极性,专门针对这项应用,Central Semiconductor开发并发布了CBRDFSH肖特基桥式整流器系列产品,非常适合用于PD输入电压极性校正。
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Central Semiconductor(中央半导体) 贴片式分立半导体选型指南
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型号- CMUT3904,CMDZ10L,CMXZ9V1TO,CMZ5935B,P4SMA16A,CMUT3906,CMPZDC2V7,CMPZDC36V,CMSZ5252B,P6SMB56A,CLL4754A,CMF64A,CMR1U-04FL,CMPD2003,CMDZ10V,CMKBR-6F,CMDZ11L,CMZ5936B,CMFSH-3I,CMZ5926BP,CMPD2004,P4SMA17A,CMSZ5253B,CZT2222A,CZR1-04,5SMC100A,CMXZ7V5TO,3SMC5.0A,CLL4753A,1SMB7.5CA,CTLDM7120-M621H,CMDZ11V,CMUDW6001,1.5SMC13CA,CMUD6263E,CMDZ12L,CMSZ5250B,CMZ5933B,CMZ5939BP,P4SMA18A,CLL4752A,1SMB130A,CMHZ5229B,CMPZDC39V,CMDZ12V,1SMB9.0A,3SMC170A,1SMB51A,1SMC110A,CMDZ13L,CMZ5934B,CFSH05-20L,CMSZ5251B,CMLD6263DO,CMPD6263S,CMLT2907A,CLL4750A,CLL4751A,P6SMB170CA,CMHZ5228B,CMPD6263A,CMDZ13V,CMPD6263C,CTLDM8120-M832DS,CTLZ5V1,CMST3410,CMOZ4L7,1SMC85A,CMSH1-100M 55,CTLZ5V6,CMDZ5251B,CSL05D,CMOZ4L3,1SMB30CA,P6SMB51A,CMXTVS5V6,CMF120A,CMXSTB200,CMZ5931B,CMF60A,CMPZ5261B,CMPT404A,1SMC85CA,CMHZ5227B,CMSH1-60 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【产品】反向耐压为200V~1000V的硅全波桥式整流器,可用于通用全波整流领域
CBR1-D020S系列是CENTRAL公司推出的硅全波桥式整流器,该系列包括5个型号:CBR1-D020S,CBR1-D040S,CBR1-D060S,CBR1-D080S,CBR1-D100S。CENTRAL该CBR1-D020S系列硅全波桥式整流器具有高耐压值、高电流能力、低泄漏电流等特点。该系列器件采用表面贴装SMDIP封装,占用电路板空间较小,可用于转向二极管阵列,通用全波整流领域。
新产品 发布时间 : 2018-06-08
【方案】以太网供电(PoE)之Central Semiconductor(中央半导体)型号推荐
描述- 以太网供电(PoE)市场的出现推动了外围电源设备(PDs)的快速增长,如摄像机、电话和网络接入点。这些应用程序中的每一个都具有独特的大小和性能要求。 Central Semiconductor(中央半导体)已开发出广泛的器件,包括肖特基桥式整流器,完美契合这些应用所需的尺寸和电气规格。
型号- CMUT3410 TR,CMSH2-100M,CMHD4448,CFSH01-30,CMNTVS12V,CMUT7410 BK,CMNDM8001,CMOD3003,CBRHD-02,CMLSH05-4,CMLT7410 TR,CBRHDSH2-100,CMOD4448,CEDM7001,CMLT7410 BK,CTLSH01-30,CMSH1-100,CMF90A,CBRHDSH1-100,CMLSH-4,CMLDM8002A,CMLSH1-40,CMLT3410,CMLT3410 TR,CTLSH01-30L,CMLDM7002A,1SMB90CA,CMNDM7001,CMUT3410 BK,CMLSH-4 BK,CMUT7410 TR,CMLD4448DO,CBRHD-01,CMASH-4,CMUT7410,CMLT7410,CBR1-D020S,CEDM8001,CEDM8004,CMUT3410,CMLSH-4 TR,CMLT3410 BK
CMUT3410 Power over Ethernet (PoE) Application Brief
型号- CMSH2-100M,CBRDFSH2-40,CMHD4448,CFSH01-30,CMNTVS12V,CMNDM8001,CBRHD-02,CMLSH05-4,CBRHDSH2-100,CBRDFSH3-60,CMOD4448,CEDM7001,CTLSH01-30,CMSH1-100,CMF90A,CBRHDSH1-100,CMLDM8002A,CMLSH1-40,CMLT3410,CTLSH01-30L,CBRDFSH1-60,CMLDM7002A,CBRDFSH3-40,CBRDFSH1-40,1SMB90CA,CMNDM7001,CBRDFSH1-100,CBRHD-01,CMASH-4,CMUT7410,CMLT7410,CBRDFSH2-60,CBR1-D020S,CEDM8001,CEDM8004,CMUT3410,CBRDFSH2-100,CMLD4448DOG
SMDIP CASE CBR1-D020S SERIES SURFACE MOUNT 1 AMP SILICON BRIDGE RECTIFIER
型号- CBR1-D060S,CBR1-040S,CBR1-D020S,CBR1-D100S,CBR1-D080S,CBR1-D020S SERIES
CBR1-D020S SERIES SURFACE MOUNT 1 AMP SILICON BRIDGE RECTIFIER
型号- CBR1-D040S,CBR1-D060S,CBR1-D020S,CBR1-D100S,CBR1-D080S
Central Semiconductor(中央半导体) CBR1-D020S数据手册
型号- CBR1-D040S,CBR1-D060S,CBR1-D020S,CBR1-D100S,CBR1-D080S
Discrete Semiconductor Sample Kit
型号- CBRHDSH1-100,CBRHDSH1-40L,CBR1F-D040S,CBR1F-D020S,CBR1U-D020S,CBRHD-02,CBR1-D080S,CBR1U-D010S,CBRHD-04,CBRHD-10,CBR1-D040S,CBRHDSH2-100,CBR1-D020S,CMFBR-6F,CBR1-D100S,CBRHDSH2-40,CBRSDSH5-40,CMKBR-6F
Discrete Semiconductor Sample Kit Bridge Rectifi ers
型号- CBRHDSH1-100,CBRHDSH1-40L,CBR1F-D040S,CBR1F-D020S,CBR1U-D020S,CBR1-D080S,CBRHD-02,CBR1U-D010S,CBRHD-04,CBRHD-10,CBR1-D040S,CBRHDSH2-100,CBR1-D020S,CMFBR-6F,CBRHDSH2-40,CBR1-D100S,CBRSDSH5-40,CMKBR-6F
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可贴PCB板厚范围:0.6~2.0mm,也支持生产软硬接合板,拼板长宽:50*50mm~550*500mm,PCBA快速贴片支持01005CHIP元件。
最小起订量: 1片 提交需求>
可定制LAMP LED、 CHIP LED、 PLCC LED、 汽车用车规级LED、COB LED的尺寸/电压/电流等参数,电压1.5-37V,电流5-150mA,波长470-940nm。
最小起订量: 30000 提交需求>
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