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PowerDsine Presentation October 2005 Page 6
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PoEp minimum voltage
Let us look on this issue under another angle assume minimum load need
to be delivered to PD by four pair is 40W
Power dissipation on a cables for 51V PSE will be 2.45W less then for 44V
Advantages of higher voltage is increase with increasing power level
0.890.84System efficiency
for ~500W PSE PS
44.88W47.52WPSE power
4.85W7.3WPower dissipation
on a cables (4P)
0.44A0.54ACurrent per pair
40W40WPd power
51V44V