Active transient response circuits, system and method for digital multiphase pulse width modulated regulators
First Claim
1. A multiphase power regulator for supplying a load comprising:
- a multiphase pulse width modulator;
an output stage comprising a high side FET, a low side FET and an inductor coupled to the multiphase pulse width modulator;
an active transient response circuit coupled between the output stage and the multiphase pulse width modulator and configured to detect a voltage level at the output stage and providing a signal to the multiphase pulse width modulator that is a function of an amplitude of a deviation of the detected voltage level from a target voltage; and
an external active transient response circuit coupled to the active transient response circuit and coupled directly to the load and configured to adjust the voltage level at the load only in response to the amplitude of the deviation crossing a selected threshold.
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Accused Products
Abstract
Disclosed is a multi-phase pulse width modulated voltage regulator and method in which transient voltage excursions or deviations that exceed the load line voltage by more than a pre-determined amount are detected by an ATR circuit and a correction signal is applied. The correction signal is in the form of asynchronous pulses and the number of such pulses is a function of the magnitude of the voltage excursion as determined by the number of thresholds that are exceeded. Also disclosed is an adaptive voltage positioning (AVP) circuit and method for early detection of a transient event by sensing voltage changes at the load and adjusting the target voltage with pre-determined current values prior to the time that ATR event changes in the current at the load are detected. The AVP load line is pre-positioned for more precise current control. Also disclosed is an adaptive filter with adjustable frequency characteristics in response to an ATR event. Also disclosed is a pulse limiting circuit. Also disclosed is a tri-state implementation. Response to transient events is further improved with an external ATR circuit coupled to the load.
31 Citations
17 Claims
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1. A multiphase power regulator for supplying a load comprising:
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a multiphase pulse width modulator; an output stage comprising a high side FET, a low side FET and an inductor coupled to the multiphase pulse width modulator; an active transient response circuit coupled between the output stage and the multiphase pulse width modulator and configured to detect a voltage level at the output stage and providing a signal to the multiphase pulse width modulator that is a function of an amplitude of a deviation of the detected voltage level from a target voltage; and an external active transient response circuit coupled to the active transient response circuit and coupled directly to the load and configured to adjust the voltage level at the load only in response to the amplitude of the deviation crossing a selected threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification