NCP1083WIRGEVB(#2): 1.25 ~ 50V @ 2.5A, 36 ~ 57V in


The NCP1083WIRGEVB implements a PoE module DC/DC converter that converts the higher voltage one the Ethernet cable to a lower voltage (12 V) with power levels up to 30W. Detection, classification and power up sequence is implemented according to IEEE802.3at (D4). The board also supports getting its power from and auxiliary input, in case PoE network is not available. Auxiliary input voltage may be as low as 9 V. The isolated flyback DC/DC converter design is optimized to support a very wide input voltage range (9 V to 57 V) without compromising the overall efficiency.

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 for long duration with loads higher than the specified 30 W. Exceeding the specified input and output values could permanently damage the board.


Manufacturer onsemi
Category Power Management
Sub-Category POE - Power Over Ethernet
Eval Board Part Number NCP1083WIRGEVBOS-ND
Eval Board Supplier onsemi
Eval Board Board not Stocked
Compliance IEEE 802.3at Type 2
Outputs and Type 1 Isolated
Voltage Out
Current Out 2.5 A
Voltage In 36 ~ 57 V
Efficiency @ Conditions >88%, 48V in, 12V @ 2.5 A
Internal Switch No
Features Current Limit (Adj. or Fixed)
Over Current Protection
Over Voltage Protection
Shutdown, Enable, Standby
Soft Start
Thermal Protection
Switching Frequency 250 kHz
Component Count + Extras 83 + 5
Design Author ONSemiconductor
Application / Target Market PoE, Power Over Ethernet
Main I.C. Base Part NCP1083
Date Created By Author 2009-11
Date Added To Library 2022-05

Eval Board


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