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RTL8211E-VL-CG Datasheet(PDF) 60 Page - Realtek Semiconductor Corp.

Part No. RTL8211E-VL-CG
Description  INTEGRATED 10/100/1000M ETHERNET TRANSCEIVER
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Maker  REALTEK [Realtek Semiconductor Corp.]
Homepage  https://www.realtek.com/en/
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RTL8211E-VL-CG Datasheet(HTML) 60 Page - Realtek Semiconductor Corp.

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RTL8211E/RTL8211EG
Datasheet
Integrated 10/100/1000M Ethernet Transceiver
52
Track ID: JATR-2265-11 Rev. 1.4
9.4. Efficiency Measurement
The efficiency of the switching regulator is designed to be above 75% in gigabit traffic mode. It is very
important to choose a suitable inductor before Gerber certification, as the Inductor ESR value will affect the
efficiency of the switching regulator. An inductor with a lower ESR value will result in a higher-efficiency
switching regulator.
The efficiency of the switching regulator is easily measured using the following method.
Figure 24, page 53 shows two checkpoints, checkpoint A (CP_A) and checkpoint B (CP_B). The switching
regulator input current (Icpa) should be measured at CP_A, and the switching regulator output current
(Icpb) should be measured at CP_B.
To determine efficiency, apply the following formula:
Efficiency = Vcpb*Icpb / Vcpa*Icpa
Where Vcpb is 1.05V; Vcpa is 3.3V. The measurements should be performed in gigabit traffic mode.
For example: The inductor used in the evaluation board is a GOTREND GTSD32-4R7M:
• The ESR value @ 1MHz is approximately 0.712ohm
• The measured Icpa is 101mA at CP_A
• The measured Icpb is 263mA at CP_B
These values are measured in gigabit traffic mode, so the efficiency of the GOTREND GTSD32-4R7M can
be calculated as follows:
Efficiency = (1.05V*263mA) / (3.3V*101mA) = 0.823 = 82.3%.
We strongly recommend that when choosing an inductor for the switching regulator, the efficiency should
be measured, and that the inductor should yield an efficiency rating higher than 75%. If the efficiency does
not meet this requirement, there may be risk to the switching regulator reliability in the long run.


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