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  • RE: LM5072: LM5072 PSPICE model

    Hi Gavin, I will close this thread for now. Please reply or open a new thread if you have any further questions. Best regards, Diang

  • LM5072: High-Speed voltage spike during transition

    Part Number: LM5072 Hello PoE support team, I have a problem that the MDI signal suffered from voltage spike issue. Please refer to the picture below, during RJ45 signal line's plug/unplug, the MDI signal will occur the voltage spike during the transition…

  • LM5072: Questions of LM5072

    TI Thinks Resolved
    Part Number: LM5072 Dear Team, Could you help to confirm the actual voltage range of LM5072 pin10, VCC According to the spec, it is 16V, but we actually tested it to 25V to make the LM5072 broken If we use 20V to supply power to VCC May I ask if the LM5072…

  • LM5072: Large ripple after change power MOSFET

    Part Number: LM5072 Hello, We designed an output 12V/2A (24-watt) POE by using LM5072-80. We encounter a strange problem after change the MOSFET (Q1 in our design). We have to change MOSFET, Q1 (APT55T10G), to other MOSFET ( SPN72T10T252TG ) due to the…

  • LM5072: LM5072 with very low Raux input (10.8V)

    TI Thinks Resolved
    Part Number: LM5072 I'm trying to retrofit an existing LM5072 circuit to use RAUX exclusively, meaning PoE will no longer be needed but the design should not be changed in principal. We want to feed in 12-24V with a +-10% limit, meaning 10.8V-26.4V…

  • LM5072: Reduce output ripple for fast transient of dynamic load

    Part Number: LM5072 Hello, We have an 802.3at PD design by using LM5072-80. The design is a flyback design with output of 12V/2A. It is working well with small output ripple (< 60mV) in static load. However, the output ripple is large than 1V when…
    • Answered

  • LM5072: PWM not continuous and Power Output is sawtoothed

    Resolved
    Part Number: LM5072 Hi, I used LM5072-80 as an isolated power for my board, which is in RAUX input mode and not for PoE application. Input voltage range is 18-72V and output is 3.3V. The schematic is almost the same as Figure32 in datasheet. But the 3…
    • Resolved

  • TPS23731: Type 3 class 1-4 25.5W with 5Vout_Suggestion POE part

    TI Thinks Resolved
    Part Number: TPS23731 Other Parts Discussed in Thread: LM5072 , TPS23754 , TPS23751 , , TLV431 , TPS23734 , TPS23756 , TPS23752 Tool/software: Hi Team, I have a project that need to support type 3 class 1-4 25.5W with 5Vout, and there would be both input power…

  • LM5072: Adding RAUX to existing circuit

    TI Thinks Resolved
    Part Number: LM5072 Other Parts Discussed in Thread: TPS23756 I need to fix up an existing PoE circuit to work with 12-24V external supply. This should be theoretically easy, I figure I simply have to add a RAUX pullup to the new Vin. The circuit uses…

  • LM5072: LM5072 voltage is not 12V

    TI Thinks Resolved
    Part Number: LM5072 Other Parts Discussed in Thread: TPS23751 , PMP11254 Our POE 12V circuit refer LM5072 12Vout 25W PoE PD http://www.ti.com.cn/cn/lit/ug/snvu100/snvu100.pdf All component is same as the reference design. The output voltage is 7.3V, and…

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