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Three-Port Voltage Regulator Basic Application Circuit

2014-11-25 11:03  
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Three-Port Voltage Regulator Basic Application Circuit
The picture shows the three-port voltage regulator basic application circuit (for example of 7805). The input AC 220V voltage would be through the transformer T1 for voltage buck and the VD1~VD4 bridge rectifier and smoothing capacitance C. After filtering it would get a very stable DC 8~12V voltage and add it to the 7805's input port. For making the circuit stably work, it is connected the capacitace C2, C1 and C3 at the input port and output port. The C2 is the input stability capacitance. When the regulator input impedance is reduced, for avoiding the oscillation, it could use the 0.1uF~1uF ceramic or tantalum capacitors. The C1 is the smoothing capacitance. If it is closing to the 7805, the capacitor C1 can be removed.