Unlike a linear regulator, however, an SMPS can also provide a step-up function and an inverted output function. SMPSs can be used to step-down a supply voltage, just as linear supplies do. ![]() The output voltage variations caused by the switching are filtered out by an LC filter. The switch mode power supply, however, uses a high frequency switch (in practice a transistor) with varying duty cycle to maintain the output voltage. The linear regulator can, therefore, tend to be very inefficient. Conventional series-regulated linear power supplies maintain a constant voltage by varying their resistance to cope with input voltage changes or load current demand changes. ![]() Switch Mode Power Supplies are the current state of the art in high efficiency power supplies. The Buck Regulator (or Forward Regulator). ![]() Size=1 Tahoma? font-family: bold font-weight:>
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