Enhancing PoE devices with Schottky Bridge Rectifiers: Central Semiconductor’s CBRDFSH Series is up to the challenge
■PoE has become one of the most convenient and efficient technology developments in modern networking. First conceived in the late 1990s and later standardized in 2003 via IEEE 802.3af, PoE technology allows for both power and data to be transmitted across a single ethernet cable from a PoE ethernet switch. This allows for device operation and data communication without requiring a power supply and ethernet switch. PoE systems are made up of two primary device types: power sourcing equipment (PSE), such as PoE switches or PoE injectors, and powered devices (PD), such as cameras or smart lighting hubs. The original IEEE standard dictated a 15.4W power sourcing rating from PSE to PD, and has since been amended multiple times. The most recent amendment to the PoE IEEE standard was in September 2018 via IEEE 802.3bt type 4, which dictates a 100W power sourcing rating.
■Every PoE PD requires an efficient bridge rectifier input stage for voltage polarity correction as the maximum voltage differential seen on a typical ethernet line can be +/- 48V, which is equivalent to 96V max. With this application specifically in mind, Central Semiconductor has developed and released its CBRDFSH Schottky bridge rectifier series, ideal for PD input voltage polarity correction.
■The CBRDFSH series of devices has a lower maximum voltage drop than standard full-wave bridge rectifiers, which translates to a low forward conduction loss. This is an essential aspect for PoE systems as the total number of viable PDs is proportionate to the collective input efficiency of the PDs; higher input efficiency translates to more viable PDs on any one network. These Schottky bridge rectifiers are available with a reverse voltage capability of 100V, which is ideal for the potential voltage differential seen on network CAT transmission lines. Additionally, these devices feature Central’s new, low profile BR DFN package, ideal for space-constrained PDs.
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efficient bridge rectifier 、 full-wave bridge rectifier 、 Schottky bridge rectifier |
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[ cameras ][ smart lighting hubs ] |
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Application note & Design Guide |
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Please see the document for details |
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DFN |
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English Chinese Chinese and English Japanese |
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2020/8/13 |
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933 KB |
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