Communications System Power Supply Design

摘要

Diverse power supply requirements coupled with a volatile telecommunications market have forced equipment manufacturers to not only cut costs but also provide more efficient and reliable power solutions to remain competitive. Semiconductor suppliers are enabling power supply system designers to embed low-cost, compact isolated power supplies directly onto their motherboards and line cards. New highly integrated, high-voltage (100V) power ASICs (such as the LM5041 cascaded and LM5030 push-pull PWM controllers) minimize the number of external components and printed circuit-board area required. Operating directly off the -48V bus, the cascaded converter can produce multiple low-voltage outputs with higher overall efficiency levels at a lower cost than multiple POL converters operating from a +12V Intermediate Bus Converter (IBC). Voice-over-Internet Protocol, Digital Subscriber Line, and Third-Generation (3G) Base Stations necessitate varying degrees of complexity in power supply design.