![]() It features a wide 4.5V to 100V input voltage range and includes a 140V, 0.5A power switch. The high voltage, low quiescent current LT8331 is an example of a device that can be configured as a Ćuk converter. The Ćuk topology can typically be obtained from a device that also provides a boost, SEPIC or flyback topology. The objective is to show the advantages and trade-offs for the Cuk and inverting charge pump, followed by a brief discussion of the inverting topology, so you can make a more informed choice when selecting a negative output circuit topology that best suits your application. The following discussion highlights differences between inverting power supply architectures, with an emphasis on intuitive thought rather than in-depth power supply design and switching theory. What does each topology do? Why choose one topology over the other? The reasons vary, with some being more obvious than others. However, engineers often unknowingly refer to these topologies by the wrong name, adding confusion to an area that already is a bit confusing. The Ćuk converter (also referred to as the two inductor inverting converter), the inverting charge pump and the single inductor inverting converter (also referred to as the inverting buck-boost) all provide a negative output voltage from a positive input voltage. Differences Between the Ćuk Converter and the Inverting Charge Pump Converter ![]()
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