PoE Applications

Power Integrations offers a range of highly integrated, low-voltage (DC-to-DC) conversion ICs for cost effective power conversion. Each IC includes a 220 V power MOSFET combined with control and protection circuitry on a single chip. Features include current limiting and thermal shutdown with automatic fault recovery capability to improve reliability. DPA-Switch devices easily accommodate the input voltage requirements for IEEE802.3af Power over Ethernet. The family includes four different MOSFET sizes and three package options to provide the most cost effective solution for each Class of PD. The family is also capable of supporting higher power devices for the IEEE802.3at PoEP standard.


Design Examples

Document Description Design
Ideas
Design
Example
Reports
Engineering
Prototype
Reports
Reference
Design
Kits
Lowered Overvoltage for PoE (Multi-class) Design Ideas are concise two-page documents describing a design for a specific application.
Undervoltage with Wide Hysteresis (Multi-class) Design Ideas are concise two-page documents describing a design for a specific application.
Power over Ethernet Power Supply (Multi-class) Engineering Prototype Reports contain a power supply reference design specification, schematic, bill of materials, transformer documentation, and pcb layout. Performance data and typical operating characteristics are included. The design has been put into production for use in our Reference Design Kits. DAK-86
Ethernet Hub (Class 0) Engineering Prototype Reports contain a power supply reference design specification, schematic, bill of materials, transformer documentation, and pcb layout. Performance data and typical operating characteristics are included. The design has been put into production for use in our Reference Design Kits. DAK-68A
DC-DC Converter (Multi-class) Design Ideas are concise two-page documents describing a design for a specific application.
PoE VoIP Phone (Class 2) Design Ideas are concise two-page documents describing a design for a specific application.
VoIP Phone (Class 2) Design Ideas are concise two-page documents describing a design for a specific application.

Recommended Product Families

The DPA-Switch DC-DC power conversion IC product family is ideally suited to supporting the different classification requirements for implementing PoE and PoEP architectures.

DPA-Switch
Product Family
Package Options PoE Class Supported
DPA423 P, G Class One
DPA424 P, G, R Class Two, Class Three
DPA425 P, G, R Class Three, Class Zero
DPA426 R Class Four


Related Design Support Documents

General Design Information
Additional Information
Product Data Sheet What is PoE?
DC-DC Selector Guide Commonly Used Terms in PoE
Package Information PoE Interoperability Testing
PoE Standards
Design Guides
802.3af Standard for PoE AN-31 DC-DC Forward Converter Design Guide
802.3at Power Over Ethernet Plus Task Force