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NCP1081
http://onsemi.com
4
SIMPLIFIED APPLICATION DIAGRAMS
Figure 4. NonIsolated Flyback with Extra Winding
Cpd
NCP1081
GATE
RTN
FB
VPORTN2
VDDH
VDDL
Rcs
Cvddh
C1comp
C2comp
Rcomp
Css
M1
R4
VPORTN1
CLASS
ARTN
ILIM1
INRUSH
TEST1
TEST2
Rclass
Rilim1
Rinrush
R1
R2
UVLO
CS
VPORTP
Rslope
D1
D2
T1
R5
Voutput
Spare
Pairs
RJ45
DB1
DB2
LD1
Rd1
Cvddl
nCLASS_AT
R3
Cload
Rosc
Data
Pairs
Figure 4 shows the same nonisolated flyback configuration as Figure 3, but adds a 12 V auxiliary bias winding on the
transformer to provide power to the NCP1081 DCDC controller via its VDDH pin. This topology shuts off the current flowing
from VPORTP to VDDH and therefore reduces the internal power dissipation of the PD, resulting in higher overall power
efficiency.
Figure 5. NonIsolated Forward Converter
Cpd
NCP1081
GATE
RTN
FB
VPORTN2
VDDH
VDDL
Rcs
Cvddh
C1comp
C2comp
Rcomp
Css
M1
Cload
R3
R4
VPORTN1
CLASS
ARTN
ILIM1
INRUSH
TEST1
TEST2
Rclass
Rilim1
Rinrush
R1
R2
UVLO
CS
VPORTP
L1
Rslope
Voutput
T1
D1
D2
D3
Spare
Pairs
RJ45
DB1
DB2
LD1
Rd1
Cvddl
nCLASS_AT
Data
Pairs
Rosc
Figure 5 shows the NCP1081 used in a nonisolated forward topology.
High Power Considerations
The NCP1081 is designed to implement various
configurations of highpower PoE systems including those
based on the IEEE802.3at standard. High power operation
can be enabled by a Dual Event Layer 1 classification or a
Single Event Layer 1 classification combined with a Layer 2
high power classification. The NCP1081 also supports
proprietary designs capable of delivering 25 W to 40 W to
the load in twopair configurations. A separate application
note describes these implementations (AND8332).
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