COMBINATION_VOLTAGE_AND_CURRENT_REGULATOR

Published:2009/6/26 3:35:00 Author:May | From:SeekIC

This voltage-regulator/current-limiter combination can be made from two 7805 regulators as shown. R1, R2, and R3 should be selected for a 5-V drop at the maximum allowable current limit. S1 selects one of the three current values. Do not forget that U1 requires 5 mA to operate and this means that the minimum current limit setting should be 10 mA or more (R1 = 1.25 kΩ). Resistor values are as follows:



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