ADD_12_V_OUTPUT_TO_5_v_BUCK_REGULATOR

Published:2009/6/26 5:27:00 Author:Jessie | From:SeekIC

By adding a flyback winding to a buck-regulator switching converter (see the figure), which is essentially a 5-V supply with a 200-mA output capability, a 12-V output (VPP) can be produced. The flyback winding on the main inductor (forming transformer T1) enables an additional low-dropout linear regulator (IC2) to create the 12-V output voltage that's needed to program EEPROMs. The required input voltage is 8 to 16 V.



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