High-Power, Quad, Monolithic, PSE Controllers
for Power over Ethernet
20   ______________________________________________________________________________________
Figure 1a. Detection, Classification, and Power-Up Port Sequence
OUT_
-4V
-9V
-18V
-48V
t
t
DETI
t
DETII
t
CLASS
150ms
150ms
21.3ms
0V
0V
80ms
Figure 1b. Detection, 2-Event Classification, and Power-Up Port Sequence
150ms
150ms
21.3ms
t
CLASSI
t
DETI
t
DETII
t
CLASSII
8ms
8ms
t
CLASSIII
21.3ms    21.3ms
80ms
0
t
0V
-4V
-9V
OUT_
-18V
-48V
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