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Frequent questions

  • [FAQ] Why does my PoE PD EVM continuously power cycle after connecting to an IEEE802.3at compliant PSE?

    Why does my PoE PD EVM continuously power cycle after connecting to an IEEE802.3at compliant PSE?

  • [FAQ] Why is soft-start so important with PoE devices?

    Why is soft-start so important with PoE devices?

  • [FAQ] How is the PoE handshake done between PSE and PD (detection, classification and inrush)?

    How is the PoE handshake done between PSE and PD (detection, classification and inrush)?

  • [FAQ] What are the anticipated changes between the IEEE802.3at and IEEE802.3bt PoE standards?

    What are the anticipated changes between the IEEE802.3at and IEEE802.3bt PoE standards?

  • [FAQ] How does the data signal and power operate in the same Ethernet cable?

    How does the data signal and power operate in the same Ethernet cable?

  • [FAQ] BQ76930: or bq76940: Zero volts reported after boot

    Part Number: BQ76930 Other Parts Discussed in Thread: BQ76940 , Why do some cell voltages read 0 after boot with the bq76930 or bq76940?

  • [FAQ] How to calculate Junction Temperature for PoE PD + PWM Controller

    Part Number: TPS23751 Hi Sir May we know how to calculation TPS23751 power dissipation? As i know, the Tj = Pd * Rjc+ Tc, am i right? Bogey

  • [FAQ] TPS2388: May TPS2388 can direct replace BCM59121?

    Part Number: TPS2388 Hi Sir May TPS2388 can direct replace BCM59121? My customer question that how many effort they need to modify HW/SW. Bogey

  • [FAQ] REF5050: DNC vs NC pins?

    Part Number: REF5050 Team, I am trying to find out the differences between the DNC pins (1 and 8) and the NC pin (7). - Are DNC used for testing/calibration during production? So they are connected to the die and therefore should be left unconnected…

  • [FAQ] How should I select the right PMIC for my application?

    Other Parts Discussed in Thread: TPS65023B , LP87561-Q1 How should I select the right PMIC for my application?

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