Onsemi NCP1081 Manuel utilisateur

EVAL BOARD USER’S MANUAL

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©Semiconductor Components Industries, LLC, 2022

November, 2022 −Rev. 0

1Publication Order Number:

EVBUM2849/D

NCP1081 Evaluation Board

User's Manual

PoE−PD Interface & Flyback Controller

Board

NCP1081REF12VC4GEVB

General

The NCP1081REF12VC4GEVB board allows easy

implementation and evaluation of a Power−over−Ethernet

powered equipment that is able to operate with an assigned

power level up to 25.5 W. The evaluation board is based on

PoE Powered Device controller NCP1081 (U2) with

integrated PoE PD interface controller and Flyback DC/DC

controller. The Flyback converter on this NCP1081 based

reference design generates a 12 V output voltage that is

isolated from the Ethernet link conductors.

Figure 1. Operational NCP1081REF12VC4GEVB

showing Basic Interconnections

The NCP1081REF12VC4GEVB board is designed as a

PoE splitter: having a PoE−enabled Ethernet port (labeled

“PoE IN”) as input and generating an isolated 12 V supply

while passing through the data to another Ethernet port

(labeled “ETH OUT”).

Quick Start Guide

Step 1: Make sure the jumper is mounted on header P3

(labeled “MPS”).

Step 2: Insert the Ethernet cable (cf. blue cable in the picture

on the left) coming from the PSE in the Ethernet connector

J2 labeled “PoE IN”.

Step 3: Observe the status LEDs.

If the PSE powers up the system, the green POWER−ON

LED (labeled “PWRON”) should be ON.

The status of the yellow LED (labeled “NCL”) depends on

the PSE being used.

Step 4: Optionally connect the turret terminals that are

labeled “GND” and “12V” to a DC electronic load (cf. black

and red clips in the picture on the left). The DC electronic

load behind the NCP1081 EVB should be operational over

a 11 V to 13 V voltage range.

NCP1081REF12VC4GEVB

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Assigned Power

The NCP1081REF12VC4GEVB will request Class 4

during Physical Layer classification. PDs need to consider

that they can be underpowered and eventually be assigned

to Class 3.

The state of the nCLASS_AT output provides information

about the power level that the PSE has assigned to the

NCP1081REF12VC4GEVB during classification. See

Table 1 to determine the assigned power based on the status

of the orange NCL led.

Table 1. CLASSIFICATION RESULT

NCL Led Assigned Class Assigned Power

off 3 13 W

on 4 25.5 W

Figure 2 shows that the load on the 12 V output should be

limited to 1.82 A to meet the maximum input average power

for Class 4 over the complete input DC voltage range.

Likewise, Figure 3 shows that the load on the 12 V output

should be limited to 0.92 A to meet the maximum input

average power for Class 3 over the complete input DC

voltage range.

The application should always operate at or below the

assigned power limit. Failure to do so will result in the PSE

disconnecting the PD !

Maintain Power Signature (MPS)

A PD should draw a minimum amount of current in order

to prevent the PSE from removing power. The load resistor

R15 was added on the bottom side of the board to be able to

make sure the load current is always sufficient and the

NCP1081REF12VC4GEVB remains powered. This load

resistor R15 is enabled when a jumper is placed on header

P3 labeled “MPS”. As can be seen on Figure 4, the input

current remains well above 10 mA over the complete PSE

output voltage range when the jumper is mounted on the

“MPS” header P3.

Depending on the minimum current the system may draw,

the resistance value of R15 should be increased for the final

design in order not to waste power unnecessarily.

For some systems, the load resistor can even be omitted.

Earth Connection

A Powered Device (PD) can operate without an earth

connection.

In case NCP1081REF12VGEVB would need to be

earthed, it should be the frame ground “Frame” that is

connected to earth. This could be implemented in one of the

following ways:

•Soldering an earthed wire in the 1.6 mm hole

(labeled “E”)

•Connecting an earthed wire with alligator clip on the

SMT Test Point on the top (TP12) or the SMT Test

Point on the bottom (TP17)

•Connecting a shielded Ethernet cable of which the

shield is earthed to the PoE−enabled Ethernet port J2

(labeled “PoE IN”)

If NCP1081REF12VGEVB is earthed, the internal

system ground “GND” should not be driven more than 15V

above or below earth potential in order not to overstress TVS

diode D21.

Requested Power

As mentioned before, the NCP1081REF12VC4GEVB

will request Class 4 during Physical Layer classification. If

a lower Class or power level is preferred, resistor R26

labeled “CLASS” should be changed. See the NCP1081

datasheet for the nominal resistance values.

NCP1081REF12VC4GEVB

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Figure 2. Output Current vs. PoE Input Voltage – Full Input Power Load (Class 4)

Figure 3. Output Current vs. PoE Input Voltage – Full Input Power Load (Class 3)

Figure 4. PoE Input Current vs PoE Input Voltage – No Output Load except R15

NCP1081REF12VC4GEVB

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Figure 5. Efficiency vs. Output Current

Figure 6. Efficiency vs. Output Current −Zoom In

NCP1081REF12VC4GEVB

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Figure 7. Efficiency vs. Output Current −from (VPP,RTN) to (12V,GND)

NCP1081REF12VC4GEVB

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Figure 8. 12 V Output Ripple and Noise

Figure 9. VDrainSource Primary Mosfet Q2 (VPD = 57 V)

Figure 10. VCathodeAnode Secondary Diode D17 (VPD = 57 V)

NCP1081REF12VC4GEVB

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Figure 11. Thermal Image −Top

Figure 12. Thermal Image −Bottom

NCP1081REF12VC4GEVB

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Figure 13. Emission Test DUT: NCP1081REF12VGEVB with 7.3 WLoad

NCP1081REF12VC4GEVB

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Figure 14. Conducted Emission – Preview Result and Final Result

Table 2. CONDUCTED EMISSION −FINAL RESULT QPK

Frequency (MHz) QuasiPeak (dBmV) Limit (dBmV) Margin (dB) Corr. (dB)

7.503000 58.48 74.00 15.52 9.6

8.038500 59.38 74.00 14.62 9.7

8.841750 59.61 74.00 14.39 9.7

9.379500 60.63 74.00 13.37 9.7

9.915000 58.32 74.00 15.68 9.7

10.047750 58.47 74.00 15.53 9.7

Table 3. CONDUCTED EMISSION −FINAL RESULT CAV

Frequency (MHz) CAverage (dBmV) Limit (dBmV) Margin (dB) Corr. (dB)

7.503000 58.25 64.00 5.76 9.6

8.038500 59.12 64.00 4.88 9.7

8.844000 59.30 64.00 4.70 9.7

9.379500 60.29 64.00 3.71 9.7

9.915000 57.94 64.00 6.06 9.7

10.047750 58.08 64.00 5.92 9.7

NCP1081REF12VC4GEVB

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Figure 15. Radiated Emission – Preview Result and Final Result

Table 4. RADIATED EMISSION −FINAL RESULT QPK

Frequency

(MHz)

QuasiPeak

(dBmV/m)

Limit

(dBmV/m)

Margin

(dB)

Meas. Time

(ms)

Bandwidth

(kHz)

Height

(cm)

Pol Azimuth

(deg)

Corr.

(dB/m)

31.160000 28.15 40.00 11.85 1000.0 120.000 98.0 V 173.0 −9.9

31.180000 26.45 40.00 13.55 1000.0 120.000 122.0 V 253.0 −9.9

34.360000 27.29 40.00 12.71 1000.0 120.000 103.0 V 138.0 −11.8

34.900000 29.86 40.00 10.14 1000.0 120.000 98.0 V 309.0 −12.1

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