Transcription of Communications System Power Supply Designs
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Communications System Power Supply Designs
LM5030,LM5041,LM5642 Communications System Power Supply DesignsLiterature Number: SNVA569 Technology EdgeCommunications System Power Supply DesignsBy L. Haachitaba Mweene & Don Ashley of National SemiconductorCommunications infrastructure equipment employs a variety of Power System components. Power factor corrected (PFC)AC/DC Power supplies with load sharing and redundancy (N+1) at the front-end feed dense, high efficiency DC/DCmodules and point-of-load converters on the back-end. A Power efficient design is required that supplies both the highervoltage analog circuits and multiple tightly regulated low-voltage supplies for the high-speed digital Communications ASIC sand recently, diverse Power Supply requirements coupled with a volatile telecommunications market have forcedequipment manufacturers to not only cut costs but to also provide more efficient and reliable Power solutions in order toremain challenging business environment has spawned new distributed voltage bus standards, such as the recent +12 VIntermediate Bus Architecture (IBA).
A preferred power supply architecture for DSL applications is illustrated in Fig. 2. A push-pull converter is used to convert the 48V input voltage to …
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