NCP1081SPCGEVB ON Semiconductor, NCP1081SPCGEVB Datasheet
NCP1081SPCGEVB
Specifications of NCP1081SPCGEVB
Related parts for NCP1081SPCGEVB
NCP1081SPCGEVB Summary of contents
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... PoE-PD Interface & DC-DC Converter Controller Introduction The NCP1081 is a member of ON Semiconductor’s high power HIPOt Power over Ethernet Powered Device (PoE−PD) product family and represents a robust, flexible and highly integrated solution targeting demanding medium and high power Ethernet applications. It combines in a single unit an enhanced PoE− ...
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DC−DC Converter Controller • Current mode control • Supports isolated and non−isolated DC−DC converter applications • Internal voltage regulators • Wide duty cycle range with internal slope compensation circuitry • Programmable oscillator frequency • Programmable soft−start time Ordering Information Part ...
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RJ− 45 Data Pairs DB1 DB2 Spare Pairs 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 ...
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RJ−45 Data Pairs DB1 DB2 Spare Pairs Figure 4. Non−Isolated Fly−back with Extra Winding Figure 4 shows the same non−isolated fly−back configuration as Figure 3, but adds auxiliary bias winding on the transformer to provide power to ...
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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 UVLO Vuvlo_on Default turn on voltage (VportP rising) Vuvlo_off Default turn off voltage (VportP falling) Vhyst_int UVLO internal hysteresis Vuvlo_pr UVLO external programming range Vhyst_ext UVLO external hysteresis Uvlo_Filter UVLO on/off filter time PASS−SWITCH ...
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Table 3. Operating Conditions Symbol Parameter VDDH REGULATOR VDDH_reg Regulator output voltage (Notes 10 and 11) Ivddh_load + Ivddl_load < with 0 < Ivddl_load < 2.25 mA VDDH_Off Regulator turn−off voltage VDDH_lim VDDH regulator current limit (Notes 10 ...
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Table 3. Operating Conditions Symbol Parameter CURRENT CONSUMPTION IvportP VPORTP internal current 1 consumption (Note 12) IvportP VPORTP internal current 2 consumption (Note 13) THERMAL SHUTDOWN TSD Thermal shutdown threshold Thyst Thermal hysteresis THERMAL RATINGS Ta Ambient temperature Tj Junction ...
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Powered Device Interface The PD interface portion of the NCP1081 supports the IEEE 802.3af and draft IEEE802.3at (D3.0) defined operating modes: detection signature, current source classification, inrush, and operating current limits. In order to give more flexibility to the user ...
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IEEE802.3at (D3.0) compliant may apply more than two fingers, but the final result will be the same as two fingers). 1st Class Event 20.5 V Class range 13 V 9.5 V Mark Range 5.4 V Reset Range 0 V Detection ...
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As soon as the application is powered by the DC−DC converter and completes initialization, the microprocessor should check if the NCP1081 detected a two event hardware classification by reading its digital input (pin IN1 in this example). If pin IN1 ...
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ILIM1 / INRUSH VPORTNx Figure 11. Current Limitation Configuration (Inrush & Ilim1 Pins) Vds_pgood threshold 1V / 9.2V VPORTNx Figure 12. Inrush and Ilim1 Selection Mechanism When VPORT reaches the UVLO_on level, the Cpd capacitor is charged with the INRUSH ...
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DC−DC Converter Controller The NCP1081 implements a current mode DC−DC converter controller which is illustrated in Figure 13. 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 NCP1081 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 ...