| 摘要 |
<p>A hysteretic buck converter provides improved regulation control, in particular for buck converter standby operation. A comparison circuit (K1, K2) compares the output voltage (Vout) of the buck converter to a waveform (VLow) that is generated from an indication (+VILOAD) of the output current of the converter, so that the turn-on time of the converter is advanced as the output current demand increases. The resulting action anticipates a reduction in output voltage (Vout) due to the increased current, preventing an excursion of the output voltage (Vout) below the ripple voltage minimum. The turn-off time of the converter is controlled by an upper threshold (VHIGH) that limits the ripple voltage maximum. The output current indication may be a measurement of output current, or may be a dynamic value calculated from the input voltage (Vin) and the output voltage (Vout) waveform.</p> |
