| 摘要 |
Two voltage regulators are provided with input for the second voltage regulator series connected to the output of the first voltage regulator, and the first voltage regulator powering a first circuit as well as the second voltage regulator. The second voltage regulator powers another circuit at a lower voltage then the first circuit so that when the first circuit does not require a high voltage, the output voltage of the first voltage regulator is reduced, and therefore, the input voltage to the second voltage regulator is reduced, decreasing the voltage drop across, and the power dissipated in, the second voltage regulator.
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