Power Over Ethernet - PD Converter with 12V 1A Output, Standard IEEE 802.3af Compliant
The STEVAL-TSP003V2 is used to demonstrate characteristics and performances of the PM8800A and has been designed to cover a broad range of power over ethernet (PoE) applications. The PM8800A is a highly integrated device embedding an IEEE 802.3af compliant powered device (PD) interface together with a PWM controller and support for auxiliary sources.
Even though the PM8800A can be configured to work in both isolated and non-isolated topologies, single or double output; this document focuses on a low cost isolated flyback converter topology with diode rectification, 12 V output voltage with an up to 1 A output current capability.
Auxiliary sources can be connected to the board on 2 input connectors. One input (AUX II) allows prevalence of the auxiliary sources with respect to the PoE, while the other input (AUX I) 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 PM8800A demonstration kit as options on the same PCB.
Features
- IEEE 802.3af compliant PD interface
- Works with power supplied from Ethernet LAN cables or from local auxiliary sources
- Line input voltage range: 40 Vdc to 60 Vdc Output voltage: 12 Vdc ± 5%
- Output current: 1 A
- Peak-to-peak output ripple: 100 mV
- Efficiency DC-DC full-load: > 88%
- Efficiency overall peak: > 85%
- Transient response ΔVoutpk-pkto 50% load step: < 200 mVpp
- ΔV in load line case: < 0.5%
Ships With
- Evaluation Board