ncp1080 ON Semiconductor, ncp1080 Datasheet - Page 3

• Manufacturer Part Number: ncp1080
• Description: Integrated Poe-pd & Dc-dc Converter Controller
• Manufacturer: ON Semiconductor

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
Spare
Pairs
Data
Figure 2 shows the integrated PoE−PD switch and DC−DC controller configured to work in a fully isolated application. The
Pairs
Figure 3 shows the integrated PoE−PD and DC−DC controller configured in a non−isolated fly−back configuration. A
Pairs
Data
RJ− 45
RJ− 45
DB1
DB2
DB1
DB2
Figure 3. Non−Isolated Fly−back Converter
R1
R2
Figure 2. Isolated Fly−back Converter
Simplified Application Diagrams
R2
R1
Rinrush
Rilim1
Rclass
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TEST2
INRUSH
UVLO
TEST1
VPORTN1
VPORTN2
Rinrush
VPORTP
ILIM1
Rclass
CLASS
Rilim1
Css
INRUSH
TEST2
TEST1
3
NCP1080
VPORTN1
VPORTP
CLASS
ILIM1
UVLO
VPORTN2
Rosc
Css Rosc
NCP1080
VDDH
GATE
VDDL
ARTN
RTN
CS
FB
Cvddh
Cvddl
VDDH
Rslope
GATE
ARTN
VDDL
RTN
CS
FB
C1comp
Cpd
LD1
Rd1
C2comp
Cvddh
Cvddl
M1
Rcs
Rcomp
Rslope
T1
C2
Cpd
LD1
Rd1
M1
Rcs
Optocoupler
OC1
T1
Z1
D1
C1
R5
R3
R4
R3
R4
Voutput
Voutput
Cload
Cload