PoE problem to ponder.(POWER puzzler #6)
Test your power supply design knowledge as it pertains to Power over Ethernet by trying your hand at answering the three questions below. Check your answers at www.powerint.com/puzzler6 and enter for a chance to win a new Apple iPod Mini.
The schematic below shows a typical Flyback PoE power supply built with a DPA-Switch[R] power conversion IC and a discrete PoE interface circuit for detection and Class 0 classification per IEEE 802.3af.
[ILLUSTRATION OMITTED]
Question 1: beginner
The PD (Powered Device) detection specification requires the PD to present an impedance of between 19 k[ohm] and 26.5 k[ohm] at input voltages between 2 VDC and 10 VDC. …
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