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| 型号： | SI3460-EVB |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 3/26页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL POE FOR SI3460 |
| 标准包装： | 1 |
| 主要目的： | 特殊用途 DC/DC，以太网供电（POE） |
| 输出及类型： | 1，非隔离 |
| 功率 - 输出： | 4W，7W，15.4W |
| 输出电压： | -48V |
| 电流 - 输出： | 83mA，146mA，321mA |
| 输入电压： | 11 ~ 16 V |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 250kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | Si3460 |
| 其它名称： | 336-1842 |
Si3460-EVB
4. PSE Detection, Classification, Power-Up, and Power Removal
The basic sequence for applying power is shown in Figure 3. Following is a description of the functions that must
be performed in each phase.
57 V
44 V
20.5 V
15.5 V
10 V
2.8 V
Time
Detection
Classification
Apply Power
Turn off
Figure 3. Detection, Classification, Powerup, and Disconnect Sequence
4.1. Detection
During the detection phase, the PSE probes with limited current and voltage to determine if a 25 k ? signature is
present. A valid PD must present between 23.75 and 26.25 k ? in the range of 2.7 to 10.1 V, with an offset (due to
the bridge diodes) of up to 1.9 V, and a parallel capacitance of between 0.05 and 0.12 μF. An IEEE-compliant PSE
probes 2.8 and 10 V, with at least a 1 V step and current limit of <5 mA. The PSE must accept signatures in the
range of 19–26.5 k ? with capacitance of up to 0.15 μF and must reject resistance <15 k ? or >33 k ? as well as
capacitive signatures >10 μF.
The strict limits on the detection phase ensure that non PoE enabled devices are not inadvertently powered. For
endpoint applications, detection must be completed within 500 ms of applying a valid signature. When configured
as a midspan there is a possibility that the PSE circuit will compete with an endpoint PSE, and, as required by the
IEEE specifications, the Si3460 is therefore required to wait at least 2 seconds after an unsuccessful detection
cycle to repeat the detection process.
Rev. 1.2
3
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI3460-XYY-GM | 制造商:SILABS 制造商全称:SILABS 功能描述:IEEE 802.3af PSE INTERFACE AND DC-DC CONTROLLER |
| SI3461 | 制造商:SILABS 制造商全称:SILABS 功能描述:SINGLE-PORT IEEE 802.3AT POE/POE+ PSE INTERFACE |
| Si3461-E01-GM | 功能描述:电源开关 IC - POE / LAN Single-Port PoE / PoE+ PSE interface RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
| SI3461-E01-GMR | 功能描述:IC POWER MANAGEMENT CTLR 11VQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| Si3461-E02-GM | 功能描述:电源开关 IC - POE / LAN Single-port PoE PoE+ PSE interface RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
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