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NCP1080
http://onsemi.com
4
SIMPLIFIED APPLICATION DIAGRAMS
Figure 4. NonIsolated Flyback with Extra Winding
Cpd
NCP1080
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
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 NCP1080 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
NCP1080
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
Data
Pairs
Rosc
Figure 5 shows the NCP1080 used in a nonisolated forward topology.
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