Designing an EMI Compliant 802.3af PD with the AS1113 and AS1114 Application Note
■The AS1113 and AS1114 are single-chip Powered device (PD) controllers for Power over Ethernet (PoE). Applications include Voice over IP (VoIP) Phones, Wireless LAN Access Point, Security and Web Cameras, Analog Telephone Adapters (ATA) and Point of Sales Terminals.
■The AS1113 and AS1114 are intended for 13W applications, per the IEEE 802.3at standard for Type 1 PDs. Both devices can interface directly to the network cable through Ethernet transformers and provides the PD and an integrated DC-DC controller. High integration minimizes the number of components and improves reliability. The AS1113 and AS1114 can be used with standard Ethernet transformer modules to allow the system designer to develop Ethernet networking systems that will meet all relevant EMC standards for EMI emissions, immunity and Surge/ESD protection.
■AS1113 and AS1114 have been architected and designed to address many EMI concerns in POE applications. The devices implement many design features that minimizes transmission of system common-mode noise on to the UTP. Any common mode noise that leaks on to the UTP will show up as Conducted or Radiated EMI, depending on the frequency. Controlling the behavior of the DC-DC converter in the AS1113 and AS1114 is critical in the management of electro-magnetic emissions.
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[ Power over Ethernet ][ PoE ][ Voice over IP Phones ][ VoIP Phones ][ Wireless LAN Access Point ][ Security Cameras ][ Web Cameras ][ Analog Telephone Adapters ][ ATA ][ Point of Sales Terminals ] |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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January 2018 |
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Revision 2.0 |
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AN014 |
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629 KB |
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