Transformed single power supply into double power

Published:2011/4/1 22:15:00 Author:Nicole | Keyword: single power supply, double power | From:SeekIC

TDA2030 is a high efficiency operational amplifier. It uses its complement output stage, and divides the single power supply in two, then transformed into double power which is needed by some low power circuit. The circuit diagram is shown above, R1, R2 have an equivalent resistance, and they form a divider to make the upper and lower voltage equal. The middle point of divider is connected to the in-phase input terminal of operational amplifier, operational amplifier is connected into voltage follower, to make the potential of O’ terminal and O terminal equal. O’ terminal is virtual ground point, it should be separated from input power supply ground. If the double power is got from R1, R2 directly, then the power supply has high resistance, poor load capacity and little practical value. After using operational amplifier, the two groups of output power has low resistance and strong load capacity.



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