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NCP1082 Datasheet(PDF) 3 Page - ON Semiconductor |
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NCP1082 Datasheet(HTML) 3 Page - ON Semiconductor |
3 / 16 page 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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