Datasheet > EPE6277S

EPE6277S

更新时间： 2024-02-18 23:30:07

品牌	Logo	应用领域
PCA		变压器局域网（LAN）标准
页数	文件大小	规格书
2页	101K
描述
Datacom Transformer, 10 BASE-T Application(s), 1CT:1.414; 1:1

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技术参数
数据手册

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EPE6277S 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Active	Reach Compliance Code：	compliant
ECCN代码：	EAR99	风险等级：	5.73
其他特性：	OPTIMIZED FOR TNETE2004 SWITCHED HUB CHIP	应用：	10 BASE-T
高度：	6.35 mm	绝缘电压：	1500 V
JESD-609代码：	e0	长度：	28.19 mm
安装特点：	SURFACE MOUNT	功能数量：	4
物理尺寸：	28.19mm X 12.45mm X 6.35mm	初级电感：	150 µH
表面贴装：	YES	端子面层：	Tin/Lead (Sn/Pb)
变压器类型：	DATACOM TRANSFORMER	匝数比 (Np:Ns)：	1CT:1.414; 1:1
宽度：	12.45 mm	Base Number Matches：	1

EPE6277S 数据手册

Enhanced Common Mode Multiport

Module for Switched Hub Transceivers

E L E C T R O N I C S I N C .

EPE6277S

The circuit below is a guideline for interconnecting PCA’s EPE6277S with Texas Instrument’s TNETE2004 10 Base-T

switched hub chip over UTP cable. This part is also recommended for Level One LXT915, LXT944 and some other

transceivers requiring 1: 2 turns ratio on the transmit side. Further details of system design, such as chip pin-out, etc. can

be obtained from the specific chip manufacturer.

This is a part derived from the parent EPE6267S and meant for those applications where stiffer EMI containment is required

such as compliance with FCC/CSPR class B. In such a case, common mode attenuation achievable by using EPE6267S

may not suffice. Users will find relief in using EPE6277S instead.

Typical insertion loss of the isolation transformer/common mode choke is 0.5dB. This parameter covers the spectrum of the

encoded signals in 10 Base-T protocol. This is low enough to allow designers to cever the entire range of permissible voltage

range at the cable. Note that the receiver side termination circuit varies among transceivers. Follow the latest circuit and

values suggested by your chosen transceiver design house.

System designers may ground the chip side center taps via a low voltage capacitor. In some cases, it is suggested to use

the secondary center tap for further EMI containment. EMC designer need to try out values that suit their particular board

layout and rules. Putting a 2KV rated capacitor is most widely practiced.

The pulldown resistors used around the RJ45 connector have been known to suppress unwanted radiation that unused wires

pick up from the immediate environment. Their placement and use are to be considered carefully before a design is finalized.

It is recommended that there be a neat separation of ground planes in the layout. It is generally accepted practice to limit the

plane off at least 0.08 inches away from the chip side pins of EPE6277S. There need not be any ground plane beyond this

point.

For best results, PCB designer should design the outgoing traces preferably to be 50Ω, balanced and well coupled to

achieve minimum radiation from these traces.

Typical Application Circuit for switched hub application. Only one port is shown

TX+

TX+-

TX-

RJ45*

RX+-

10/100

Transceiver

EPE6277S

RX+

RX-

75Ω

Chassis

Ground

Note: Transmit side termination is typically 49.9Ω but not shown here.

Receive side connection varies with transceiver.

Consult manufacturers for latest circuit & values.

* Connection shown for DCE such as a Hub, Switch, ect.

PCA ELECTRONICS, INC.

16799 SCHOENBORN ST.

NORTH HILLS, CA 91343

CSE6277S Rev. 1 2/13/97

TEL: (818) 892-0761

FAX: (818) 894-5791

http://www.pca.com

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