POE7W2X12-R

更新时间： 2024-11-28 06:04:35

品牌	Logo	应用领域
库柏 - COOPER		变压器 SMPS变压器以太网
页数	文件大小	规格书
4页	313K
描述
Power-over-Ethernet (PoE) Application Notes

阅读下载

中文翻译

获取价格

技术参数
数据手册

如果您发现信息不准确，欢迎纠错

POE7W2X12-R 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Transferred	包装说明：	ROHS COMPLIANT
Reach Compliance Code：	compliant	ECCN代码：	EAR99
风险等级：	5.11	其他特性：	FLYBACK; HEIGHT DIMENSION INCLUDES TERMINAL ALSO; TURNS RATIO: 1:0.529:0.588:0.588
高度：	8.4 mm	最大输入电压：	60 V
最小输入电压：	29.5 V	长度：	17.1 mm
安装特点：	SURFACE MOUNT	初级绕组数量：	2
次级绕组数量：	2	最大工作频率：	250 kHz
最高工作温度：	85 °C	最低工作温度：	-40 °C
输出电压 1：	12 V	包装方法：	REEL
物理尺寸：	L17.1XB16.0XH8.4 (mm)	额定功率：	7 W
初级电感：	100 µH	表面贴装：	YES
变压器类型：	SMPS TRANSFORMER	宽度：	16 mm
Base Number Matches：	1

POE7W2X12-R 数据手册

Power-over-Ethernet (PoE) Application Notes

PoE - the Cost-Effective Means of Power Supply

In addition to data communications between the two devices, Power-

over-Ethernet (PoE) enables an Ethernet Switch/Hub to power a

remote device over an existing LAN cable. Without PoE, any remote

device needs to be powered independently. Typically, device power is

derived from an AC-DC adapter or at board level inside the device.

This adds cost and requires locating the device near a source of AC

power.

Device installation is further complicated by different safety codes,

AC voltages and wall plugs around the world. PoE avoids these

problems by supplying low-voltage DC power directly to the Powered

Device (PD) from the Power Sourcing Equipment (PSE) that is located

in the Ethernet Switcher or mid-span Hub and eliminates the

complexity of AC power sources.

Converter Topology Choices: Flyback Vs. Forward

To ensure that all equipment is protected and devices operate

Flyback or forward converter topologies are normally used in a

properly when connected, the IEEE established a universal standard

powered device DC-DC converter, depending on the PD’s voltage and

current requirements.

(IEEE802.3af). This specifies the power requirements of the PSE and

the PD, and the communication protocol between the two -

regardless of manufacturer or configuration.

Flyback Topology (See Figure 1)

Traditional Power-over-Ethernet

Benefit: Lowest cost for <6A output currents.

The 12.95W power limit was adequate for IP telephony when

IEEE802.3af was initially approved in 2003. Network cameras, were

initially the most prevalent application enabled by the Power-over-

Ethernet standard.

When to Use: Typically for output voltages greater than 2.5V.

Recommended for multi-output, voltages (>12V) and for applications

requiring lowest cost.

Advantages:

However, the popularization of WLAN applications triggered

developers’ and marketers’ inventiveness for creating more power-

hungry derivative devices, such as Video IP Phones, Multi-channel

WLAN Access Points (like the ones in the IEEE802.11n upcoming

MIMO standard) and Pan-Tilt-Zoom IP Cameras.

• Output isolated from input.

• No output inductor required.

Disadvantages:

Higher output ripple current results in higher output capacitor cost

and medium efficiency due to higher peak and rms currents.

All these devices typically require between 13W and 30W - more

than the normally available 13W.

Enhancing Power-over-Ethernet

Input

Output

In December, 2004, the IEEE802 established a PoEPlus group to

study the market needs and possible technical solutions to address

higher power applications while maintaining backward compatibility

with the original standard. In September, 2005, the group set and

approved, as binding, objectives for the IEEE802.3at Power-over-

Ethernet Enhancements. One of the main objectives was providing

maximum power to PDs as allowed within practical limits of at least

30W.

Vin

Figure 1. Transformer Flyback Topology

12 3 4

中文翻译

下载PDF

与POE7W2X12-R相关器件

型号	品牌	获取价格	描述	数据表
POE7W3X3.3	COOPER	获取价格	SMPS Transformer, 7W
POE7W3X3.3-R	COOPER	获取价格	Power-over-Ethernet (PoE) Application Notes
POE7W3X5.0	COOPER	获取价格	SMPS Transformer, 7W
POE7W3X5.0-R	COOPER	获取价格	Power-over-Ethernet (PoE) Application Notes
POE806U-8MP-N-R	PHIHONG	获取价格	8-Port 95W per Port Midspan
POE80U-560G	PHIHONG	获取价格	80W Power Over Ethernet Adapter
POE80U-560G_11	PHIHONG	获取价格	80W Power over Ethernet Adapter
POE90U-1BT	PHIHONG	获取价格	90W Single Port Power over Ethernet Midspan IEEE802.3BT Compliant Power Injector
POE90U-1BT-N	PHIHONG	获取价格	90W Single Port Power over Ethernet Midspan IEEE802.3BT Compliant Power Injector
POE-A	ALD	获取价格	CERAMIC RESONATORS

与POE7W2X12-R相关文章

解析光耦仿真器：升级光耦合器技术的必要性
2024-11-18

49
英伟达新一代Blackwell GPU过热问题致交付延迟
2024-11-18

38
国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
2024-11-14

67
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
2024-11-14

62

产品中心

服务支持

精选活动

关于我们

帮助中心

POE7W2X12-R

POE7W2X12-R 技术参数

POE7W2X12-R 数据手册

与POE7W2X12-R相关器件

与POE7W2X12-R相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

POE7W2X12-R

POE7W2X12-R 技术参数

POE7W2X12-R 数据手册

与POE7W2X12-R相关器件

与POE7W2X12-R相关文章

您还可以找

您在本页遇到什么问题？