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Three-terminal integrated voltage regulator constant current

2014-11-04 21:16  
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Three-terminal integrated voltage regulator constant current source circuit
Figure 1 shows the constant current source circuit composed of 7805. Resistor R is connected at the output and public ends to form a fixed constant current, then thecurrent flows through the load RL and then back to power supply. Regulator works in the suspended state. The circuit uses regulator to change its own differential pressure to maintain constant current flowing through the load when the load changes. Output current Io = 5V / R 10 ID,in the formula, ID = 1.5mA ( using 7805 , ID = 1.5mA ). Therefore, changing the size of the R can adjust output current.