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NCP1081 Datasheet(PDF) 3 Page - ON Semiconductor

Part No. NCP1081
Description  Integrated High Power PoE-PD Interface & DC-DC Converter Contr
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1081 Datasheet(HTML) 3 Page - ON Semiconductor

 
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NCP1081
http://onsemi.com
3
SIMPLIFIED APPLICATION DIAGRAMS
Figure 2. Isolated Fly−back 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
RJ−45
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 PoE−PD switch and DC−DC controller configured to work in a fully isolated application. The
output voltage regulation is accomplished with an external opto−coupler and a shunt regulator (Z1).
Figure 3. Non−Isolated Fly−back 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
RJ−45
DB1
DB2
LD1
Rd1
Cvddl
nCLASS_AT
Rosc
R3
Cload
Data
Pairs
Figure 3 shows the integrated PoE−PD and DC−DC controller configured in a non−isolated fly−back configuration. A
compensation network is inserted between the FB and the COMP pin for overall stability of the feedback loop.


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