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NCP1082 Datasheet(PDF) 3 Page - ON Semiconductor

Part # NCP1082
Description  Integrated PoE-PD & DC-DC Converter Controller with 9V Auxiliary Supply Support
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1082 Datasheet(HTML) 3 Page - ON Semiconductor

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NCP1082
http://onsemi.com
3
Simplified Application Diagrams
Figure 2. Isolated Fly−back Converter with Rear Auxiliary Support
NCP1082
Rcs
Cvddl
Cvddh
Cpd
Css
Rosc
M1
T1
Cload
LD1
Rd1
Rclass
Rilim1
Rinrush
Optocoupler
R3
R4
R5
C1
Z1
Rslope
C2
Voutput
D1
OC1
GATE
RTN
FB
VPORTN2
VDDH
VDDL
VPORTN1
CLASS
ARTN
ILIM1
INRUSH
TEST
AUX
UVLO
CS
VPORTP
Data
Pairs
Spare
Pairs
R1
R2
RJ−45
DB1
DB2
Raux1
VAUX(+)
VAUX(−)
Raux2
Raux3
D3
D4
Cline
Z_line
COMP
SS
OSC
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 with Rear Auxiliary Support
NCP1082
Rcs
Cvddl
Cvddh
Cpd
Css
Rosc
M1
T1
Cload
LD1
Rd1
Rclass
Rilim1
Rinrush
Rslope
Voutput
D1
GATE
RTN
FB
VPORTN2
VDDH
VDDL
VPORTN1
CLASS
ARTN
ILIM1
INRUSH
TEST
AUX
UVLO
CS
VPORTP
Data
Pairs
Spare
Pairs
R1
R2
RJ−45
DB1
DB2
Raux1
VAUX(+)
VAUX(−)
Raux2
Raux3
D2
D3
Cline
Z_line
COMP
SS
OSC
R3
R4
C1comp
C2comp
Rcomp
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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