ncp1082 ON Semiconductor, ncp1082 Datasheet - Page 3

• Manufacturer Part Number: ncp1082
• Description: Integrated Poe-pd & Dc-dc Converter Controller With 9v Auxiliary Supply Support
• Manufacturer: ON Semiconductor

Spare
output voltage regulation is accomplished with an external opto−coupler and a shunt regulator (Z1).
compensation network is inserted between the FB and the COMP pin for overall stability of the feedback loop.
Spare
Pairs
Pairs
Pairs
Pairs
Data
Data
Figure 2 shows the integrated PoE−PD switch and DC−DC controller configured to work in a fully isolated application. The
Figure 3 shows the integrated PoE−PD and DC−DC controller configured in a non−isolated fly−back configuration. A
RJ−45
RJ−45
DB1
DB2
DB1
DB2
Raux2
VAUX(−)
Raux2
VAUX(+)
VAUX(−)
VAUX(+)
Figure 3. Non−Isolated Fly−back Converter with Rear Auxiliary Support
Figure 2. Isolated Fly−back Converter with Rear Auxiliary Support
D3
Raux3
D2
Raux3
Raux1
Raux1
D4
Z_line
D3
Z_line
Simplified Application Diagrams
Cline
Cline
R2
R1
R2
R1
http://onsemi.com
Rinrush
Rclass
Rinrush
Rclass
Rilim1
Rilim1
Css
Css
INRUSH
TEST
VPORTN1
VPORTN2
UVLO
AUX
VPORTP
CLASS
ILIM1
INRUSH
TEST
VPORTN1
VPORTN2
VPORTP
CLASS
ILIM1
UVLO
AUX
3
SS
SS
Rosc
NCP1082
NCP1082
Rosc
OSC
OSC
VDDH
VDDL
ARTN
VDDH
GATE
VDDL
GATE
ARTN
COMP
COMP
RTN
RTN
CS
FB
CS
FB
Rslope
Cvddl
Cvddl
Rslope
C1comp
Cvddh
Cvddh
Rcomp
Cpd
Rcs
Cpd
Rd1
LD1
Rd1
C2comp
LD1
C2
M1
M1
Rcs
T1
T1
Optocoupler
D1
D1
OC1
R3
R4
Z1
Voutput
Cload
Voutput
Cload
R5
C1
R3
R4