Design contains obsolete parts

NCP1081SPCGEVB(#1): 1.25 ~ 50V @ 2.5A, 36 ~ 57V in

Summary

The NCP1081SPCGEVB implements a PoE power splitter that converts the voltage on the Ethernet cable to a lower voltage. The board is equipped with 2 RJ45 connectors, one connector serves as the data and power input and the other connector is the data output. Ethernet data is untouched by the board and simply forwarded.

Close to the switching MOSFET voltages on the board may exceed 200 V (@ 250 kHz). Temperature of board and its components may exceed 85°C during normal operation. The Evaluation board was designed to operate correctly under these conditions.

The input voltage should never exceed 57 V nor should the evaluation board be loaded with loads higher than the specified 30 W. Exceeding the specified input and output values could permanently damage the board.

Specifications

Manufacturer onsemi
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number NCP1081SPCGEVBOS-ND
Eval Board Supplier onsemi
Eval Board Normally In Stock
Topology Step Down
Outputs and Type 1 Isolated
Voltage Out: Factory Set 12 V
Current Out 2.5 A
Voltage In 36 ~ 57 V
Efficiency @ Conditions >88%, 48V in, 12V @ 2.5 A
Voltage Out Range 1.25 ~ 50 V
Features Current Limit (Adj. or Fixed)
Shutdown, Enable, Standby
Soft Start
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 250 kHz
Standby Current [Typical] 2.5 mA
Quiescent Current [Typical] 4.7 mA
Component Count + Extras 75 + 2
Internal Switch No
Design Author ONSemiconductor
Application / Target Market PoE, Power Over Ethernet
Standby Current [Maximum] 3.5 mA
Quiescent Current [Maximum] 6.5 mA
Main I.C. Base Part NCP1081
Date Created By Author 2011-12
Date Added To Library 2016-05

Support Documents & Media

NCP1081SPCGEVB - User Guide NCP1081 - Datasheet

Media

NCP1081SPCGEVB_Schematic_Full.png NCP1081SPCGEVB_Board_1_Full.jpg NCP1081SPCGEVB_Board_2_Full.jpg NCP1081SPCGEVB_Block_Diagram_Full.png