STEVAL-TSP006V2

STEVAL-TSP006V2 Power over Ethernet - PD converter with 3.3 V 3 A output, standard IEEE 802.3af compliant Data brief Description This document focuses on a reference design for a simple, low cost 3.3 V 3 A flyback converter based on the PM8800A device. The PM8800A is a highly integrated device embedding an IEEE 802.3af compliant “Powered Device” (PD) interface together with a PWM controller. It can be successfully used in all low power, low cost PoE applications. 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: 3.3 Vdc ± 5%  Output current: 3 A  Peak-to-peak output ripple: 30 mV  Efficiency DC-DC full-load: > 83%  Efficiency overall peak: > 80%  Transient response Voutpk-pk to 50% load step: < 400 mVpp  V in load line case: < 0.5% May 2014 DocID026440 Rev 1 For further information contact your local STMicroelectronics sales office. 1/7 www.st.com $8;, , & Q)  9    DocID026440 Rev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lectrical diagram STEVAL-TSP006V2 Electrical diagram Figure 1. STEVAL-TSP006V2 demonstration board: electrical schematic  STEVAL-TSP006V2 2 Introduction Introduction This document details the characteristics and performances of the PM8800A demonstration kit STEVAL-TSP006V2 which has been designed to cover a broad range of power over ethernet (PoE) applications. The PM8800A is a highly integrated device embedding an IEEE 802.3af compliant powered device (PD) interface together with a PWM controller and support for auxiliary sources. Even though the PM8800A can be configured to work in both isolated and non-isolated topologies, single or double output; this document focuses on a low cost isolated flyback converter topology with diode rectification, 3.3 V output voltage with an up to 3 A output current capability. Auxiliary sources can be connected to the board on 2 input connectors. One input (AUX II) allows prevalence of the auxiliary sources with respect to the PoE, while the other input (AUX I) allows the usage of a wall adaptor with voltage lower than the internal PoE UVLO threshold and still benefits from the inherent inrush and DC current limit. The above mentioned configurations are all supported by the PM8800A demonstration kit as options on the same PCB. DocID026440 Rev 1 3/7 7 Efficiency 3 STEVAL-TSP006V2 Efficiency Figure 2. STEVAL-TSP006V2 overall and DC/DC efficiency 67(9$/7639 HIILFLHQF\  (II>@    2YHUDOO HIILFLHQF\  '&'&HIILFLHQF\                     ,RXW>P$@ $0 4/7 DocID026440 Rev 1 STEVAL-TSP006V2 4 References References 1. PM8800A - datasheet - “Integrated IEEE 802.3af compliant PoE-PD interface and PWM controller with support of external source”. 2. AN4415 - “Power over Ethernet - PD converter with 3.3 V 3 A output, standard IEEE 802.3af compliant”. DocID026440 Rev 1 5/7 7 Revision history 5 STEVAL-TSP006V2 Revision history Table 1. Document revision history 6/7 Date Revision 30-May-2014 1 Changes Initial release. DocID026440 Rev 1 STEVAL-TSP006V2 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. 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