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AN2783 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN2783 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 47 page  September 2008 Rev 2 1/47 AN2783 Application note PM8800 demonstration kit for standard and high power PoE PD interface and power supply, with auxiliary sources Introduction This document details the characteristics and performances of the PM8800 demonstration kit which has been designed to cover a broad range of power over Ethernet (PoE) applications. PM8800 is a highly integrated device embedding an IEEE802.3af compliant powered device (PD) interface together with a PWM controller and support for auxiliary sources. Even though PM8800 can be configured to work in both isolated and non-isolated topologies, this application note focuses on an isolated topology only, in two different output power configurations (10 W and 20 W) and 2 different output voltages (5 V and 3.3 V). The PM8800 demonstration kit supports diode as well as synchronous rectification. Auxiliary sources can be connected to the board on 2 input points. One input allows prevalence of the auxiliary sources with respect to the PoE, while the other input allows the usage of a wall adaptor with voltage lower than the internal PoE UVLO threshold and still benefits from the inherent inrush and DC current limit. The above mentioned configurations are all supported by the PM8800 demonstration kit as options on the same PCB. The bill of material (BOM) (see Section 5 on page 12) provides the list of components to be mounted for each of the targeted configurations. Figure 1. PM8800 demonstration kit The high-power board appears on the left of the photo and standard board is on the right. www.st.com |
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