基于Si3480设计的PoE电源管理技术
the si3480 is a power manager intended for use with the si3452 power over ethernet (poe) controller. the si3480 enables the use of a smaller, lower cost, and more efficiently-utilized power supply in an unmanaged poe power sourcing equipment (pse) system.
the si3452 is capable of delivering over 30 w per port, which means that, in a typical 8-port system, a 240 w power supply would have to be used to avoid overload. typically, not all ports are used at full power; so, a smaller power supply in the range of 30 to 150 w can be used along with the si3480 power management controller.
the si3480 power management controller is pin programmed. the pins are used to set the power supply capacity, the number of low power (category 1, 15.4 w), and high power (category 2, 30 w) ports, the port priority, and the detection timing (alternative a or alternative b). the si3480 uses the real time overload and current monitoring capability of the si3452 to manage power for up to eight ports. power management is based on actual consumption rather than mere classification in order to supply power to the greatest number of ports.
the si3480 also provides led drive to indicate port status and drive an led bar graph display to indicate the power supply capacity in use. if a port is denied power due to power supply capacity limitations, the led indicators provide a simple and intuitive indication, helping a user recognize and correct the overload situation by rebalancing loads or adding mid-span power injectors to ports that would not otherwise be powered. in case of a port overload, the port is easily re-enabled by disconnecting the powered device (pd) and then reconnecting the pd after correcting the overload situation.
si3480主要特性：
enables use of a smaller power supply for a 4 or 8 port poe system
self-contained solution operates without the need for a host for unmanaged operation
no software required
no data isolation required
fully compliant with ieee 802.3 clause 33 for power over ethernet including the 802.3at amendment for higher power (30 w category 2 ports)
pin programmable for overall power supply capacity, port power level, port priority, and detection timing
led indication of port status and overall power consumption
20-pin quad flat package (4x4 mm)
4x4 mm pcb footprint; rohs compliant
extended operating temperature range (–40 to +85℃)
图1。si3480功能方框图
图2。si3480典型应用电路图
2019年5G芯片占整体市场份额的2％，高通具有41％的市场份额
奥动新能源发布新一代4.0换电站,将换电时间缩短至20秒
亚马逊FireHD6拆解：做工优秀
物联网智能硬件核心SoC芯片商安凯微6月13日网上申购
东丽开发出了高刚性、高耐热性、无色透明的芳族聚酰胺薄膜
基于Si3480设计的PoE电源管理技术
通讯设备、物联网及智慧城市企业九联科技发布2022第一季度报告
三星将推出Odyssey G9新显示器，首款1000R曲线的消费级显示器
逆变器费电怎么办，必须平稳运行
iphone8什么时候上市?iphone8最新消息:脸部识别+无线充电+梦幻外形,售价创新高,你攒钱了吗?
恩智浦与MicroEJ共同开发新平台加速器
虹科PCAN工程机械应用系列关键特性
凌力尔特推出同步降压-升压型转换器 LTC3113
PLC与PC-based控制及其在包装行业应用的差异
美光更新路线图：明年底推GDDR7，2025年底推256GB DDR5-12800
dfrobotSTM32 Cortex M3开发板简介
采用AT89S52和VC++的实现步进电机实时显示控制系统设计
尴尬！Pixel手机更新Android10正式版时当场翻车
洗衣机使用的五大常见误区浅析
联通公布物联网合作伙伴的招募结果，将共同赋能推动物联网蓬勃发展
the si3452 is capable of delivering over 30 w per port, which means that, in a typical 8-port system, a 240 w power supply would have to be used to avoid overload. typically, not all ports are used at full power; so, a smaller power supply in the range of 30 to 150 w can be used along with the si3480 power management controller.
the si3480 power management controller is pin programmed. the pins are used to set the power supply capacity, the number of low power (category 1, 15.4 w), and high power (category 2, 30 w) ports, the port priority, and the detection timing (alternative a or alternative b). the si3480 uses the real time overload and current monitoring capability of the si3452 to manage power for up to eight ports. power management is based on actual consumption rather than mere classification in order to supply power to the greatest number of ports.
the si3480 also provides led drive to indicate port status and drive an led bar graph display to indicate the power supply capacity in use. if a port is denied power due to power supply capacity limitations, the led indicators provide a simple and intuitive indication, helping a user recognize and correct the overload situation by rebalancing loads or adding mid-span power injectors to ports that would not otherwise be powered. in case of a port overload, the port is easily re-enabled by disconnecting the powered device (pd) and then reconnecting the pd after correcting the overload situation.
si3480主要特性：
enables use of a smaller power supply for a 4 or 8 port poe system
self-contained solution operates without the need for a host for unmanaged operation
no software required
no data isolation required
fully compliant with ieee 802.3 clause 33 for power over ethernet including the 802.3at amendment for higher power (30 w category 2 ports)
pin programmable for overall power supply capacity, port power level, port priority, and detection timing
led indication of port status and overall power consumption
20-pin quad flat package (4x4 mm)
4x4 mm pcb footprint; rohs compliant
extended operating temperature range (–40 to +85℃)
图1。si3480功能方框图
图2。si3480典型应用电路图
2019年5G芯片占整体市场份额的2％，高通具有41％的市场份额
奥动新能源发布新一代4.0换电站,将换电时间缩短至20秒
亚马逊FireHD6拆解：做工优秀
物联网智能硬件核心SoC芯片商安凯微6月13日网上申购
东丽开发出了高刚性、高耐热性、无色透明的芳族聚酰胺薄膜
基于Si3480设计的PoE电源管理技术
通讯设备、物联网及智慧城市企业九联科技发布2022第一季度报告
三星将推出Odyssey G9新显示器，首款1000R曲线的消费级显示器
逆变器费电怎么办，必须平稳运行
iphone8什么时候上市?iphone8最新消息:脸部识别+无线充电+梦幻外形,售价创新高,你攒钱了吗?
恩智浦与MicroEJ共同开发新平台加速器
虹科PCAN工程机械应用系列关键特性
凌力尔特推出同步降压-升压型转换器 LTC3113
PLC与PC-based控制及其在包装行业应用的差异
美光更新路线图：明年底推GDDR7，2025年底推256GB DDR5-12800
dfrobotSTM32 Cortex M3开发板简介
采用AT89S52和VC++的实现步进电机实时显示控制系统设计
尴尬！Pixel手机更新Android10正式版时当场翻车
洗衣机使用的五大常见误区浅析
联通公布物联网合作伙伴的招募结果，将共同赋能推动物联网蓬勃发展