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Three-Port Voltage Regulator Internal Equivalent Circuit

2014-11-07 01:03  
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Three-Port Voltage Regulator Internal Equivalent Circuit
The three-port voltage regulator's three ports are input port U1, output port Uo and common port COM which is usually connecting to the ground. Its internal equivalent circuit is shown in the picture. It is made up by the adjustable tube, protection circuit, control circuit, error amplifier and so on. The voltage between Uo and COM port is comparing with the referenced voltage Uref. They are usually keeping same when working. And when the input voltage UI or output curent Io have variation, they would keep the output voltage Uo stable.