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 solu
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 +/-12V and to provide electrical isolation.
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