Circuits and methods for improving transient response of hysteretic DC-DC converters
First Claim
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1. A method of operating a hysteretic DC-DC converter, the method comprising:
- monitoring an output voltage of a hysteretic DC-DC converter, the output voltage being coupled to a load;
differentiating the output voltage to generate a control signal indicative of a difference between current drawn by the load and current flowing through an output inductor of the converter;
injecting the control signal into a control loop of the converter, andadjusting a reference signal to a hysteretic comparator of the converter based at least on the control signal injected into the control loop.
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Abstract
A hysteretic DC-DC converter includes an observer circuit configured to generate an observer control signal for injection into the control loop of the converter. The observer circuit may be configured to differentiate the output voltage of the converter to generate a differentiated output voltage. A transconductance amplifier may be configured to output the observer control signal from the differentiated output voltage. The observer control signal may be injected into the control loop in a summing node.
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Citations
20 Claims
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1. A method of operating a hysteretic DC-DC converter, the method comprising:
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monitoring an output voltage of a hysteretic DC-DC converter, the output voltage being coupled to a load; differentiating the output voltage to generate a control signal indicative of a difference between current drawn by the load and current flowing through an output inductor of the converter; injecting the control signal into a control loop of the converter, and adjusting a reference signal to a hysteretic comparator of the converter based at least on the control signal injected into the control loop. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A hysteretic DC-DC converter comprising:
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a power output stage configured to couple or decouple an input voltage to an output inductor to generate an output voltage; a hysteretic comparator having an output node coupled to the power output stage; and an observer circuit configured to differentiate the output voltage to generate an observer control signal and to inject the control signal into a control loop of the hysteretic DC-DC converter to adjust an input to the hysteretic comparator, the control signal being indicative of a difference between a current drawn by a load and a current flowing through the output inductor. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method of operating a hysteretic DC-DC converter, the method comprising:
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generating a control signal indicative of output current of the converter; injecting the control signal into a control loop of the hysteretic DC-DC converter; and regulating the output voltage of the hysteretic DC-DC converter by adjusting an input to a hysteretic comparator of the hysteretic DC-DC converter based at least on the injected control signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification