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Adjustable Regulator

Abstract: linear regulator design
Text: Application Hint 28 OV to 25V Adjustable Regulator by Jerry Kmetz An adjustable power supply should provide a range that includes OV. However, as shown in Figure 1, a typical adjustable regulator does not facilitate adjustment to volt­ ages lower than VREF the internal bandgap voltage . Feedback-loop summing junction ADJ must be biased at VREF to