NCP1081
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3
SIMPLIFIED APPLICATION DIAGRAMS
Figure 2. Isolated Flyback Converter
LD1
Rd1
NCP1081
Spare
Pairs
Rcs
Cvddh
Cpd
Css
Rosc
M1
T1
Cload
Rclass
Rilim1
Rinrush
R1
R2
Optocoupler
R3
R4
R5
C1
Z1
Rslope
C2
Voutput
RJ45
D1
DB1
DB2
OC1
GATE
RTN
FB
VPORTN2
VDDH
VDDL
VPORTN1
CLASS
ARTN
ILIM1
INRUSH
TEST1
TEST2
UVLO
CS
VPORTP
Cvddl
nCLASS_AT
Data
Pairs
Figure 2 shows the integrated PoEPD switch and DCDC controller configured to work in a fully isolated application. The
output voltage regulation is accomplished with an external optocoupler and a shunt regulator (Z1).
Figure 3. NonIsolated Flyback Converter
NCP1081
GATE
RTN
FB
VPORTN2
VDDH
VDDL
Rcs
Cvddh
Cpd
C1comp
C2comp
Rcomp
Css
M1
T1
R4
VPORTN1
CLASS
ARTN
ILIM1
INRUSH
TEST1
TEST2
Rclass
Rilim1
Rinrush
UVLO
CS
VPORTP
Rslope
Voutput
Spare
Pairs
R1
R2
RJ45
DB1
DB2
LD1
Rd1
Cvddl
nCLASS_AT
Rosc
R3
Cload
Data
Pairs
Figure 3 shows the integrated PoEPD and DCDC controller configured in a nonisolated flyback configuration. A
compensation network is inserted between the FB and the COMP pin for overall stability of the feedback loop.
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