| 摘要 |
<p>A switched regulator circuit provides step-up and step-down operation in which the level of the input voltage (Vin) can be greater, equal to, or less than a preset controlled output voltage (Vout). A four switch arrangement (22,33,34,27) or two switch arrangement provides buck, boost, and buck-boost regulation under variable frequency valley-peak current mode control. A single sense resistor (38) may be utilized for sensing inductor (24) current during each duty cycle.</p> |
