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RC1585 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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RC1585 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 4 page Application Bulletin AB-28 Power Conversion for the Data Communications Market www.fairchildsemi.com REV. 1.0.0 1 Abstract This application bulletin discusses the transition from tradi- tional telephony to converged voice and data over Internet Protocol (IP) and its implications for the power conversion of such systems. A few power conversion examples are pro- vided complete of applications schematics. Introduction The arm wrestling between voice and data has concluded in favor of the latter with all the major players now posturing for leadership of the migration from traditional voice to Internet Protocol (IP) telephony. On the short term the huge investments in both traditional telephony infrastructure and data over IP warrants that over the next few years we will have to provide power conversion for both types of systems as well as for the converged systems to come. Current Environment with Separate Networks Fig. 1 shows the current situation with voice going through traditional PBX (Private Branch Office), Central Office, and Switch to the Public Switch Telephone Network (PSTN). On independent paths the data travels from Routers to wide Area Networks (WAN) and the video goes trough a third indepen- dent path. Fig.1. Separate Networks for Voice, Data and Video Migration to Converged Voice/ Data IP Fig. 2 shows the envisioned converged Voice/Data/Video system over IP. At the center of this new universe is the Internet Protocol Wide Area Network, with all the services, including voice, data, video and wireless communications gravitating around it. Fig. 2. Voice/Data/video Over IP Telecom –48V DC Power Distribution Traditionally telecom systems have been distributing a DC power (-48V typically) obtained from a battery back up being continually charged by a Rectifier/Charger from the AC line. Subsequently the –48V is converted into various low positive DC voltages (Fig. 3 shows 12V only for simplicity) as well as back to AC voltages as necessary. Fig. 3. Telecom –48V DC power distribution Datacom AC Power Distribution Data centric systems tend to rely on an Uninterruptible Power Supply (AC UPS) front-end for distributing AC power, which subsequently is converted into the basic constituents, -48V, AC power and low voltage DC (again, for simplicity we are only showing a 12V DC in Fig. 4). Home Phone/Fax Wide Area Network (WAN) Router Video Video Video Voice Switch Central Office Data Office PBX (Private Branch Exchange) Public Switch Telephone Network (PSTN) Video Router WLAN IPWAN = Internet Protocol Wide Area Network WLAN = Wireless Local Area Network PSTN = Public Switched Telephone Network IP WAN PSTN DC/AC DC/DC Battery Backup Rectifier /Charger -48V AC LINE 12V DC -48V 120/208V AC |
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