基于PD69101设计的混合信号高压以太网供电方案
基于pd69101设计的混合信号高压以太网供电方案
microsemi公司的pd69101是单端混合信号高压以太网供电(poe)驱动器,它采用以太网开关和使能网络器件在同一电缆上共享电源和数据,能检测eee802.3af-2003兼容的受电设备(pd)和ieee802.3at大功率设备.dc输入电压44 - 57 vdc,内置了3.3v dc稳压器,工作温度从-40°到+85℃,具有超温保护和电压监视与保护等.本文介绍pd69101主要特性,方框图以及2对和4对(数据和供电)典型应用电路图.
microsemi’s pd69101 is a single port, mixed-signal, high-voltage power over ethernet driver. the device is utilized in ethernet switches and enables network devices to share power and data over the same cable. it enables detection of ieee802.3af-2003 compliant pds (powered devices) and ieee802.3at high power devices, thus, ensuring safe power feeding and disconnection of ports with full digital control and a minimum of external components. integrating power, analog and state of the art logic, the pd69101 device fits into a single 24-pin, plastic qfn package.
a “plug and play” device, the pd69101 executes all real time functions as specified in the ieee802.3af-2003 (“af”) and ieee802.3at high power (“at”) standards, including load detection, “af” and “at” classification, and using multiple classification attempts (mca).
the pd69101 :
• is designed to detect and disable disconnected ports, utilizing dc disconnection methods, as specified in the ieee 802.3af-2003 and ieee802.3ar-2009 standards.
• can optionally detect legacy/pre-standard pd devices.
• provides pd protection such as over-load, under-load, over-voltage, over-temperature and short-circuiting.
• supports supply voltages ranging from 44 v to 57 vdc with no need for additional power supply sources.
• is a low power device using an internal 0.3 ω mosfet and an external 0.5 ω sense resistor.
the chip includes built-in internal thermal protection.
two leds provide port state’s indication and port type (af/at).
pd69101主要特性:
fully ieee802.3af-2003 and ieee802.3at-2009 compliant
includes two-event classification
supports pre-standard pd detection
supports cisco devices detection
single dc voltage input (44 - 57 vdc)
supports 2 pairs and 4 pairs (data and spare power feeding)
vmain out of range protection
wide temperature range: -40°to +85℃
over-temperature protection
low thermal dissipation (0.5 ω sense resistor)
includes on/off command pin
2 x direct leds drive
continuous port monitoring and system data
configurable load current setting
configurable at/af modes
configurable standard and legacy detection mode
power soft start mechanism
on-chip thermal protection
voltage monitoring & protection
built in 3.3 vdc regulator
internal power on reset
rohs compliant
low rdson fet: 0.3 ω
图1.pd69101内部方框图
图2.pd69101典型的2对应用电路图
图3.pd69101典型的4对应用电路图
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microsemi公司的pd69101是单端混合信号高压以太网供电(poe)驱动器,它采用以太网开关和使能网络器件在同一电缆上共享电源和数据,能检测eee802.3af-2003兼容的受电设备(pd)和ieee802.3at大功率设备.dc输入电压44 - 57 vdc,内置了3.3v dc稳压器,工作温度从-40°到+85℃,具有超温保护和电压监视与保护等.本文介绍pd69101主要特性,方框图以及2对和4对(数据和供电)典型应用电路图.
microsemi’s pd69101 is a single port, mixed-signal, high-voltage power over ethernet driver. the device is utilized in ethernet switches and enables network devices to share power and data over the same cable. it enables detection of ieee802.3af-2003 compliant pds (powered devices) and ieee802.3at high power devices, thus, ensuring safe power feeding and disconnection of ports with full digital control and a minimum of external components. integrating power, analog and state of the art logic, the pd69101 device fits into a single 24-pin, plastic qfn package.
a “plug and play” device, the pd69101 executes all real time functions as specified in the ieee802.3af-2003 (“af”) and ieee802.3at high power (“at”) standards, including load detection, “af” and “at” classification, and using multiple classification attempts (mca).
the pd69101 :
• is designed to detect and disable disconnected ports, utilizing dc disconnection methods, as specified in the ieee 802.3af-2003 and ieee802.3ar-2009 standards.
• can optionally detect legacy/pre-standard pd devices.
• provides pd protection such as over-load, under-load, over-voltage, over-temperature and short-circuiting.
• supports supply voltages ranging from 44 v to 57 vdc with no need for additional power supply sources.
• is a low power device using an internal 0.3 ω mosfet and an external 0.5 ω sense resistor.
the chip includes built-in internal thermal protection.
two leds provide port state’s indication and port type (af/at).
pd69101主要特性:
fully ieee802.3af-2003 and ieee802.3at-2009 compliant
includes two-event classification
supports pre-standard pd detection
supports cisco devices detection
single dc voltage input (44 - 57 vdc)
supports 2 pairs and 4 pairs (data and spare power feeding)
vmain out of range protection
wide temperature range: -40°to +85℃
over-temperature protection
low thermal dissipation (0.5 ω sense resistor)
includes on/off command pin
2 x direct leds drive
continuous port monitoring and system data
configurable load current setting
configurable at/af modes
configurable standard and legacy detection mode
power soft start mechanism
on-chip thermal protection
voltage monitoring & protection
built in 3.3 vdc regulator
internal power on reset
rohs compliant
low rdson fet: 0.3 ω
图1.pd69101内部方框图
图2.pd69101典型的2对应用电路图
图3.pd69101典型的4对应用电路图
变压器可以通过哪几种方式来减小泄漏感应？
低频疲劳试验机与高频疲劳试验机的区别性，你知道多少？
Net程序员面试需要准备什么
数字化及数字化转型的具体内涵是什么？
导热硅脂不容易涂抹怎么办
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