Output Voltage Adjustable Circuit

Published:2011/8/18 2:44:00 Author: | Keyword: Output, Voltage, Adjustable | From:SeekIC

The picture shows the output voltage adjustable circuit, and it also has the over-current protection circuit. The purpose of the EXT port's current limiting circuit is to protect the integrated voltage regulator. It should consider the external connecting transistor and FE's discreteness and the maximum output current, so then it could choose the R2's resistance value. For assuring the current limiting, it is connected the R3 and VT2 whose current limiting value is 0.7V/R3. The UOUT's external connected resistance RA and RB could be used to adjust the output voltage. Because the UOUT port's internal chip has connected to the high-impedance resistance (10MΩ) for detecting and the accelerated capacitance. So even the RA and RB use the hundreds KΩ resistance it would not generate the error. So this could design the low-current-consumption adjustable voltage regulator power.



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