In this note it is described the application environment in which the LNBPxx device operates and which are the benefits it brings against the discrete solutions most frequently adopted in satellite TV set-topboxes.From the application point of view, the very minimum requirement for this application is to get a selectable 13/18 V regulated DC output, 500mA, on which a 22KHz square wave can be superimposed or not. Even if the task seems simple, a discrete approach always leads to a complex circuit, full of trade-offs to keep low the cost, especially when some extra features are needed.
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