Switching regulator forms constant-current source


Posted on Jun 21, 2012

Many applications require current sources rather than voltage sources. When you need a high-current source, using a linear regulator is inadvisable, because of the high power dissipation in the series resistor. To solve the wasted-power problem, you can use a switch-mode regulator. The circuit of Figure 1 uses IC1, an LM2576 adjustable regulator. It needs only a few external elements and has an adjustable sensing input, which you use for controlling the output current. Resistor RSC is a current sensor.



The second half of the TL082 op amp, IC2B, operates as a noninverting amplifier. The required gain depends on the output current you need: G=VREF/VSC, where G is gain, VREF is the voltage on the sensing input of the LM2576, and VSC is the voltage across R




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