RTL8111C-VB-GR View Datasheet(PDF) - Realtek Semiconductor

Part Name

Description

MFG CO.

RTL8111C-VB-GR

INTEGRATED GIGABIT ETHERNET CONTROLLER FOR PCI EXPRESS™ APPLICATIONS

Realtek Semiconductor 

RTL8111C

Datasheet

From the output side measured at Pin 1, the voltage ripple must be within 100mV. Choosing different

types and values of output capacitor (C18, C19) and power inductor (L20) will seriously affect the

efficiency and output voltage ripple of switching regulators. The following figures show the effects of

different types of capacitors on the switching regulator’s output voltage.

The blue square wave signal (top row) is measured at the output of SROUT12 (Pin1) before the power

inductor (L20). The yellow signal (second row) is measured after the power inductor (L20), and shows

there is a voltage ripple. The green signal (lower row) is the current. Data in the following figures was

measured at gigabit speed.

Figure 13. Ceramic 22µF 1210 (X5R) (Good)

Figure 14. Ceramic 22µF 0805 (Y5V) (Bad)

Integrated Gigabit Ethernet Controller for PCI Express

27

Track ID: JATR-1076-21 Rev. 1.5

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