Buck_boost_voltage_regulator

Published:2009/7/23 22:35:00 Author:Jessie | From:SeekIC

A disadvantage of the standard step-up and stop-down circuits is the limitation of the input voltage range. For a step-up circuit (Fig. 4-2), the battery voltage must always be less than the programmed output voltage, and for a step-down circuit (Fig. 4-3), the battery voltage must always be greater than the output voltage. Figure 4-8 eliminates this disadvantage, and allows a battery voltage above the programmed output voltage to decay to well below the output voltage. The values of R2 and R3 are determined, as described for Fig. 4-2.



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