HYBRID ANALOG/DIGITAL POINT-OF-LOAD CONTROLLER

摘要

In one example, there is disclosed a hybrid analog-digital point-of-load controller (ADPOL) for use in a power supply. The ADPOL is configured to respond to transient current loads. In the presence of moderate current transients, power is clocked by a digital power core, which may be programmatically configured to adjust pulse width in response to the transient. In the presence of larger current transients, control may be passed to an analog transient compensator, which includes high-speed circuitry selecting between a very high-duty-cycle clock and a very low-duty-cycle clock, which will drive the transient back to the digital control domain.

主权项

1. A hybrid analog-digital point-of-load controller for regulating an output voltage comprising:
a programmable digital power core (DPC) configured to sense the output voltage, compare the output voltage to a reference voltage, and provide a DPC clock output; an analog transient compensator (ATC) configured to sense the output voltage, and comprising:
a clock generator configured to generate a high-duty-cycle clock and a low-duty-cycle clock; anda first selector logic operable to select an ATC clock comprising either the high-duty-cycle clock or the low-duty-cycle clock responsive to the output voltage; and a second selector logic for selecting between the DPC clock and the ATC clock.