Many applications in the automotive environment are required to constantly be live even if a vehicle is parked and not operated. Examples of such systems are memories which need to keep their content, clocks which need to keep running or sensors which need to constantly operate for purposes of protecting a vehicle. Very little power is needed in such 'sleep' states. Currents are typically in the micro amps range. Automotive manufacturers are forced to design to a maximum power budget, for example 150 microA at 5 V which has to include the actual load as well as all the losses from the voltage conversion from the 12 V car battery. This will ensure the battery does not fully discharge during a long rest of the vehicle. To save components and money in a particular application, it is advantageous to use one power supply to provide the extremely high efficiency in low output load mode ('sleep mode') and also be able to provide the power for the system when it is fully turned on and in normal use. This paper will show application solutions for such systems. lt lists different ways of achieving very high efficiency sleep mode, explains how an efficiency measurement is best taken as well as show how important it is to look at the whole power budget and not only on defined quiescent currents. One example will be the problem with an enable pin: Depending on how it is implemented there will be some current flowing in the on state or the off state.


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    Title :

    Automotive switching DC to DC regulator concepts with high efficiency sleep mode


    Contributors:


    Publication date :

    2007


    Size :

    3 Seiten, 3 Bilder, 2 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English





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