NCP1082DEG ON Semiconductor, NCP1082DEG Datasheet
NCP1082DEG
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NCP1082DEG Summary of contents
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... Converter Controller with 9 V Auxiliary Supply Support Introduction The NCP1082 is a member of ON Semiconductor’s Power over Ethernet Powered Device (PoE−PD) product family and represents a robust, flexible and highly integrated solution targeting demanding Ethernet applications. It combines in a single unit an enhanced PoE− ...
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... Compensation Circuitry • Programmable Oscillator Frequency • Programmable Soft−start Time Ordering Information Part Number NCP1082DEG NCP1082DER2G †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. VPORTP DETECTION AUXILIARY ...
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VAUX(+) D4 RJ−45 DB1 Data Pairs Raux1 Raux2 D3 DB2 Raux3 Spare Pairs Z_line VAUX(−) Figure 2. Isolated Fly−back Converter with Rear Auxiliary Support Figure 2 shows the integrated PoE−PD switch and DC−DC controller configured to work in a fully ...
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VAUX(+) D4 RJ−45 DB1 Data Pairs Raux1 Raux2 D3 DB2 Raux3 Spare Pairs Z_line VAUX(−) Figure 4. Non−Isolated Fly−back with Extra Winding and Rear Auxiliary Support Figure 4 shows the same non−isolated fly−back configuration as Figure 3, but adds a ...
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Table 1. Pin Descriptions Name Pin No. Type VPORTP 1 Supply VPORTN1 6,8 Ground VPORTN2 RTN 7 Ground ARTN 14 Ground VDDH 16 Supply VDDL 17 Supply CLASS 2 Input INRUSH 4 Input ILIM1 5 Input UVLO 3 Input GATE ...
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Table 2. Absolute Maximum Ratings Symbol Parameter VPORTP Input power supply RTN Analog ground supply 2 ARTN VDDH Internal regulator output VDDL Internal regulator output CLASS Analog output INRUSH Analog output ILIM1 Analog output UVLO Analog input OSC Analog output ...
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Recommended Operating Conditions Operating conditions define the limits for functional operation and parametric characteristics of the device. Note that the functionality of the device outside the operating conditions described in this section is not warranted. Operating outside the recommended operating ...
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Table 3. Operating Conditions Symbol Parameter AUXILIARY SUPPLY OPERATION – AUX PIN AUX_threshold AUX pin internal threshold AUX_bias_min Minimum Voltage required on the AUX pin for low auxiliary supply operation AUX_bias_max Maximum Voltage allowed on the AUX pin AUX_res_ladder Resistor ...
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Table 3. Operating Conditions Symbol Parameter VDDH REGULATOR VDDH_reg Regulator output voltage (Notes 10 and 11) VDDH_Off Regulator turn−off voltage VDDH_lim VDDH regulator current limit (Notes 10 and 11) VDDH_Por_R VDDH POR level (rising) VDDH_Por_F VDDH POR level (falling) VDDH_ovlo ...
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Table 3. Operating Conditions Symbol Parameter OSCILLATOR DutyC Maximum duty cycle Frange Oscillator frequency range F_acc Oscillator frequency accuracy CURRENT CONSUMPTION IvportP VPORTP internal current consumption 1 (Note 12) IvportP VPORTP internal current consumption 2 (Note 13) THERMAL SHUTDOWN TSD ...
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Powered Device Interface The PD interface portion of the NCP1082 supports the IEEE 802.3af defined operating modes: detection signature, current source classification, inrush and operating current limits. In order to give more flexibility to the user and also to keep ...
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Auxiliary Supply Support To support applications connected to non PoE enabled networks and minimize the bill of materials, the NCP1082 supports drawing power from an external supply. The NCP1082 supports the IEEE 802.3af standard when the PoE capability is available ...
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Vds_pgood threshold 9.2 V VPORTNx Figure 13. Inrush and Ilim1 Selection Mechanism When VPORT reaches the UVLO_on level, the Cpd capacitor is charged with the INRUSH current (in order to limit the internal power dissipation of the ...
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DC−DC Converter Controller The NCP1082 implements a current mode DC−DC converter controller which is illustrated in Figure 14. VDDL 1 COMP Current Slope Compensation 11 kW Blanking CS time VDDL Soft−start Internal VDDH and VDDL ...
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Current Limit Comparator The NCP1082 current limit block behind the CS pin senses the current flowing in the external MOSFET for current mode control and cycle−by−cycle current limit. This is performed by the current limit comparator which, on the CS ...
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... P P1 BOTTOM VIEW *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. The product described herein may be covered by one or more US patents pending. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein ...