We’re all familiar with linear IC regulators, especially the three-pin TO-220 package types like the 7805 and the LM317. They’re inexpensive, and their low-noise andfast transient response make them ideal for many applications. Their one drawback is efficiency. For example, a 7805 regulator delivering one amp from an input of 12 volts will dissipate seven watts of heat while delivering five watts to the load. Plus, a large heatsink would be required to keep it cool enough to operate...
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Electronic Gadgets 200806 (Figure 6 layout)