| 摘要 |
<p>A novel monolithic step-down dc-dc buck converter (500) that uses n (n≥2) parallel slices to achieve a high output current with a smaller filter capacitor is provided. Each of the n slices (510) may be operated with a phase difference of 360°/n. Each of the converter slices, may be based on a synchronous rectifier topology to avoid the excessive power losses introduced by the diode component conventional step-down buck converters. Hysteretic control may be used (with or without pulse-width modulation and pulse-frequency modulation) to provide an internal gate-drive waveform without the need to provide a dedicated clock signal or oscillator circuit. The hysteretic control is further refined using digital control techniques to enforce a brief dead time between the activation of each slice such that undesirable circulating currents are prevented. A significant advantage of the proposed multi-slice step-down dc-dc buck converter and its associated control is that the semiconductor switches, filter inductors and capacitor, and the control circuit may be fabricated as part of a single monolithic integrated circuit.</p> |
