高效率的升压转换器提供48V的IP电话

IP电话的需要，在同一条电缆上的数据和电源。48V高电压电源的需要，以减少在电缆的电压降。本应用笔记介绍了一个DC-DC升压转换器，可以提供所需的48V电源从12V电源通常在这样的系统的主机，。它提供了低电压纹波，必须防止数据错误。Maxim>AppNotes>AUTOMOTIVEKeywords:High-EfficiencyBoostConverterProvides48VforIPPhonesDec27,2001APPLICATIONNOTE911High-EfficiencyBoostConverterProvides48VforIPPhonesIPphonesrequirethatdataandpoweronthesamecable.Ahighvoltagepowersourceof48Visrequired,toreducethevoltagedropinthecable.ThisapplicationnotedescribesaDC-DCstep-upconverterthatcandelivertherequired48Vsupply,fromthe12Vsourcetypicallyavailableinthehostofsuchsystems.Itdeliverslow-voltageripple,essentialtopreventdataerrors.Isolationisprovidedbythe12Vpower-supply.Forasystemwithoneortwoports,acustom-designedDC-DCconverterismoresuitablethanpowermodules,or"bricks",sincebrickstendtobeb