参考设计
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Class 4- Dual PoE+ (Power Over Ethernet)
PMP6998.1: The PMP6998 reference design is an isolated Flyback which uses an LM5072 and is intended for Power over Ethernet (PoE) applications. It can generate isolated outputs of 3.3 Volts at 3.3 Amps and 5 Volts at 2 Amps from an input of 38 to 60 Volts DC. An auxiliary input supply of 12 Volts may also be used with this design.
PMP6998 Class 4- Dual PoE+ (Power Over Ethernet) | TI.com
PMP6998: The PMP6998 reference design is an isolated Flyback which uses an LM5072 and is intended for Power over Ethernet (PoE) applications. It can generate isolated outputs of 3.3 Volts at 3.3 Amps and 5 Volts at 2 Amps from an input of 38 to 60 Volts DC. An auxiliary input supply of 12 Volts may also be used with this design.
Class 4- Dual PoE+ (Power Over Ethernet)
PMP6998.2: The PMP6998 reference design is an isolated Flyback which uses an LM5072 and is intended for Power over Ethernet (PoE) applications. It can generate isolated outputs of 3.3 Volts at 3.3 Amps and 5 Volts at 2 Amps from an input of 38 to 60 Volts DC. An auxiliary input supply of 12 Volts may also be used with this design.
LM5072 12Vout 25W PoE PD Power Reference Design for IP Camera
LM5072-12V-REF: This LM5072 25W PoE PD Power reference board is specially designed for IP Net Cameras powered by PoE. As the PD side’s power converter of a PoE system, this Eval-board converts 48 Vdc to 12 Vdc to directly power the motor driver for the IP Net Camera’s body rotation and zoom lens. Other regulators such as LM26400 from Texas Instruments can be used to convert the 12Vdc to 3.3Vdc, 2.5Vdc, 1.8Vdc and 1.2Vdc to power the processor of an IP Net Camera as shown in figure 11. This board can provide total power up to 25W as specified by the PoE Plus IEEE802.3at standard. In addition, this Eval-board can be interfaced to any PSE that follows detection and classification procedures defined by the IEEE802.3af standard. In summary, this Eval-board is the ideal solution for a Pre-PoE Plus IP Net Camera application. This design has 2 auxilliary inputs to allow use of inexpensive 12Vdc and 24Vac regulated adapters to take advantage of the LM5072’s versatile auxiliary power options. 12Vdc power can by provided to the load, bypassing the LM5072, by connecting a 12Vdc regulated adapter to the 12V AUX Input Port. When regulated 12Vdc is available, it can be delivered directly to the load, bypassing the LM5072, by connecting to the 12V AUX Input Port. When the regulated 12Vdc is present at the 12V AUX input port before 48V PoE voltage is present, the PoE startup signature detection resistance of the PD is significantly reduced. This signals the PSE to not deliver power to the PD. If 12Vdc is added after 48V PoE voltage is present, the PD signature resistance changes and will signal the PSE to stop providing power to the PD. In either case the regulated 12Vdc will turn off the LM5072 and can reduce power losses from the converter and the PoE line. The LM5072’s RAUX configuration is utilized for the 24V AUX input port to bypass the internal hot swap MOSFET allowing the 800mA current limit of the LM5072 to be ignored. This allows the input voltage for the 24V AUX input port to go down to 16Vdc and up to 60Vdc. A key function for automatic selection of supply Dominance Option is implemented for the 24V AUX input port. By connecting pin 1 and pin 2 by a jumper, as shown in figure 4, the 24V AUX is made to be the dominant input voltage, even if 48V PoE input voltage is present. Alternatively, if pin 2 and pin 3 are jumpered, as shown in figure 4, the LM5072 will be placed in non-dominance mode. The theory and general application of PoE is beyond the scope of this document. For detailed PoE information, please see the LM5072 datasheet. This document includes a schematic, BOM, layout and detailed test results. This board was build and tested, but it is not available at this time.
PMP6998 Class 4- Dual PoE+ (Power Over Ethernet) | TI.com
PMP6998: The PMP6998 reference design is an isolated Flyback which uses an LM5072 and is intended for Power over Ethernet (PoE) applications. It can generate isolated outputs of 3.3 Volts at 3.3 Amps and 5 Volts at 2 Amps from an input of 38 to 60 Volts DC. An auxiliary input supply of 12 Volts may also be used with this design.
LM5072-12V-REF LM5072 12Vout 25W PoE PD Power Reference Design for IP Camera | TI.com
LM5072-12V-REF: This LM5072 25W PoE PD Power reference board is specially designed for IP Net Cameras powered by PoE. As the PD side’s power converter of a PoE system, this Eval-board converts 48 Vdc to 12 Vdc to directly power the motor driver for the IP Net Camera’s body rotation and zoom lens. Other regulators such as LM26400 from Texas Instruments can be used to convert the 12Vdc to 3.3Vdc, 2.5Vdc, 1.8Vdc and 1.2Vdc to power the processor of an IP Net Camera as shown in figure 11. This board can provide total power up to 25W as specified by the PoE Plus IEEE802.3at standard. In addition, this Eval-board can be interfaced to any PSE that follows detection and classification procedures defined by the IEEE802.3af standard. In summary, this Eval-board is the ideal solution for a Pre-PoE Plus IP Net Camera application. This design has 2 auxilliary inputs to allow use of inexpensive 12Vdc and 24Vac regulated adapters to take advantage of the LM5072’s versatile auxiliary power options. 12Vdc power can by provided to the load, bypassing the LM5072, by connecting a 12Vdc regulated adapter to the 12V AUX Input Port. When regulated 12Vdc is available, it can be delivered directly to the load, bypassing the LM5072, by connecting to the 12V AUX Input Port. When the regulated 12Vdc is present at the 12V AUX input port before 48V PoE voltage is present, the PoE startup signature detection resistance of the PD is significantly reduced. This signals the PSE to not deliver power to the PD. If 12Vdc is added after 48V PoE voltage is present, the PD signature resistance changes and will signal the PSE to stop providing power to the PD. In either case the regulated 12Vdc will turn off the LM5072 and can reduce power losses from the converter and the PoE line. The LM5072’s RAUX configuration is utilized for the 24V AUX input port to bypass the internal hot swap MOSFET allowing the 800mA current limit of the LM5072 to be ignored. This allows the input voltage for the 24V AUX input port to go down to 16Vdc and up to 60Vdc. A key function for automatic selection of supply Dominance Option is implemented for the 24V AUX input port. By connecting pin 1 and pin 2 by a jumper, as shown in figure 4, the 24V AUX is made to be the dominant input voltage, even if 48V PoE input voltage is present. Alternatively, if pin 2 and pin 3 are jumpered, as shown in figure 4, the LM5072 will be placed in non-dominance mode. The theory and general application of PoE is beyond the scope of this document. For detailed PoE information, please see the LM5072 datasheet. This document includes a schematic, BOM, layout and detailed test results. This board was build and tested, but it is not available at this time.
LM5072 5V out 25W IEEE 802.3at Compliant POE+ PD Power Reference Design
POE-PD-POWER-REF: This LM5072 based 5V out 25W POE+ PD power supply reference design was prototyped to be fully compliant with IEEE 802.3at standard. The design converts 48 Vdc to 5 Vdc. It can deliver up to 25W power as specified by the IEEE 802.3at standard. It has a 2 event detection circuit which can identify the PSE as either Type one or Type two. ( See National Semiconductor Application note `Fully Compliant IEEE 802.3at Interface Using the LM5072/LM5073` for details ) The 2 event detection circuit is located on the bottom layer of the PC board. In those applications where this 2 event detection feature is not required, the user only needs to populate top layer components. The input current limit is 800 mA. The efficiency of this design is high enough to keep input current under 800mA at 38Vin full load. The input under voltage lock has 7V hysteresis, with 38V rise and 31V fall. This design also has output short circuit protection. This design can also be powered by a 24V AUX power supply. In this configuration, the AUX input port bypasses the LM5072 internal hot swap MOSFET and allows input current to be greater than the 800 mA limit.
Class 4- Dual PoE+ (Power Over Ethernet) - PMP6998.2 - TI Tool Folder
PMP6998: The PMP6998 reference design is an isolated Flyback which uses an LM5072 and is intended for Power over Ethernet (PoE) applications. It can generate isolated outputs of 3.3 Volts at 3.3 Amps and 5 Volts at 2 Amps from an input of 38 to 60 Volts DC. An auxiliary input supply of 12 Volts may also be used with this design.
POE-PD-POWER-REF LM5072 5V out 25W IEEE 802.3at Compliant POE+ PD Power Reference Design | TI.com
POE-PD-POWER-REF: This LM5072 based 5V out 25W POE+ PD power supply reference design was prototyped to be fully compliant with IEEE 802.3at standard. The design converts 48 Vdc to 5 Vdc. It can deliver up to 25W power as specified by the IEEE 802.3at standard. It has a 2 event detection circuit which can identify the PSE as either Type one or Type two. ( See National Semiconductor Application note `Fully Compliant IEEE 802.3at Interface Using the LM5072/LM5073` for details ) The 2 event detection circuit is located on the bottom layer of the PC board. In those applications where this 2 event detection feature is not required, the user only needs to populate top layer components. The input current limit is 800 mA. The efficiency of this design is high enough to keep input current under 800mA at 38Vin full load. The input under voltage lock has 7V hysteresis, with 38V rise and 31V fall. This design also has output short circuit protection. This design can also be powered by a 24V AUX power supply. In this configuration, the AUX input port bypasses the LM5072 internal hot swap MOSFET and allows input current to be greater than the 800 mA limit.
