STEVAL-TSP005V2

STEVAL-TSP005V2 Power over Ethernet - PD converter with 5 V 2 A output, standard IEEE 802.3af compliant Data brief Description This document focuses on a reference design for a simple, low cost 5 V 2 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: 5 Vdc ± 5%  Output current: 2 A  Peak-to-peak output ripple: 30 mV  Efficiency DC-DC full-load: > 86%  Efficiency overall peak: > 84%  Transient response Voutpk-pk to 50% load step: < 300m Vpp  V in load line case: < 0.5% May 2014 DocID026436 Rev 1 For further information contact your local STMicroelectronics sales office. 1/7 www.st.com     $8;,,  5 .   73 %/$&. 5 .   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X) & - $09 5 N   73 '& 28738 7   5HG 5 N - 5-GD WDMDFN   60$-$ 1   2/7  &KDVVLV Electrical diagram STEVAL-TSP005V2 Electrical diagram Figure 1. STEVAL-TSP005V2 demonstration board: electrical schematic  STEVAL-TSP005V2 2 Introduction Introduction This document details the characteristics and performances of the PM8800A demonstration kit STEVAL-TSP005V2 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, 5 V output voltage with an up to 2 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. DocID026436 Rev 1 3/7 7 Efficiency 3 STEVAL-TSP005V2 Efficiency Figure 2. STEVAL-TSP005V2 overall and DC/DC efficiency (II >@   67(9$/ 7639HIILFLHQF\     2YHUDOO  HIILFLHQF\ '&'&  HIILFLHQF\           ,RXW>P$@      $0 4/7 DocID026436 Rev 1 STEVAL-TSP005V2 4 References References 1. PM8800A - datasheet “Integrated IEEE 802.3af compliant PoE-PD interface and PWM controller with support of external source”. 2. AN4377 - “Power over Ethernet - PD converter with 5 V 2 A output, standard IEEE 802.3af compliant” DocID026436 Rev 1 5/7 7 Revision history 5 STEVAL-TSP005V2 Revision history Table 1. Document revision history 6/7 Date Revision 30-May-2014 1 Changes Initial release. DocID026436 Rev 1 STEVAL-TSP005V2 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. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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