參數(shù)資料
型號(hào)： SI3452MS8-KIT
廠(chǎng)商： Silicon Laboratories Inc
文件頁(yè)數(shù)： 4/36頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR SI3452
特色產(chǎn)品： Si3452 Quad High-Voltage Port Controller for PoE and PoE+PSEs
標(biāo)準(zhǔn)包裝： 1
主要目的： 特殊用途 DC/DC，以太網(wǎng)供電（POE）
板類(lèi)型： 完全填充
已供物品： 板
已用 IC / 零件： Si3452
其它名稱(chēng)： 336-1836
Si3452
12
Rev. 1.3
4. Functional Description
Integrating four independent, high-voltage PSE port interfaces, the Si3452 high-voltage port controller enables an
extremely flexible solution for virtually any PoE or PoE+ PSE application. The Si3452 provides all of the high-
voltage Power over Ethernet PSE functions.
Each port of the Si3452 integrates all high-voltage PSE controller functions needed for a quad-port PoE design,
including the power MOSFET, efficient current-sensing circuitry, transient voltage surge suppressor, and multiple
detect and disconnect circuits. The external BOM is typically only a single filter capacitor on each high-voltage port.
When a PD device has been properly detected and classified, the port is powered by a –54 V nominal supply with
continuous monitoring of voltage and current for feedback to the host system.
In addition to the required IEEE features, the Si3452 includes many additional features:
Per port current / voltage monitoring and measurement
Support for 1-Event and 2-Event classification algorithms
Start up in shutdown or auto mode
Alternative A (typically used for endpoint systems) or Alternative B (typically used for midspan systems)
detection timing
4.1. Detection
The Si3452 has per-port signature detection that satisfies the IEEE Std 802.3-2005 specifications. However, by
utilizing a 3-point voltage-forced detection method, the Si3452 yields robust recognition of valid and invalid
powered device (PD) signatures, properly identifying signatures often mischaracterized by other detection
techniques.
Figure 4. PSE Sequencing (3-Point Detection Followed by 2-Event Classification and Powerup)
Vport Relative to GND
The detection circuitry performs the function of setting the output voltage on any channel to the proper value for
detection or classification and then measuring the resulting line current.
A typical detection cycle consists of applying 4 V, then 8 V, then 4 V again with the current limit set to 3 mA. The
current is measured after an appropriate settling time. For a valid PD, the detection signature must be compliant
with the detection voltage both increasing and decreasing.
3 point
detection
2 event
classification
Port powerup
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SI3453 制造商:SILABS 制造商全稱(chēng):SILABS 功能描述:QUAD HIGH-VOLTAGE PORT CONTROLLER FOR POE AND POE PSES
Si3453A-B01-GM 功能描述:熱插拔功率分布 Quad PoE PSE Port Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
SI3453A-B01-GMR 功能描述:熱插拔功率分布 Quad PoE PSE Port Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
SI3453A-B02-GM 制造商:Silicon Laboratories Inc 功能描述:QUAD POE PSE PORT CONTROLLER (AUTO, ENDPOINT, DC DISCONNECT) - Trays 制造商:Silicon Laboratories Inc 功能描述:IC POE PSE PORT CTLR QUAD 40QFN
SI3453A-B02-GMR 制造商:Silicon Laboratories Inc 功能描述:QUAD POE PSE PORT CONTROLLER (AUTO, ENDPOINT, DC DISCONNECT) - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC POE PSE PORT CTLR QUAD 40QFN
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