Circuits and methods for synchronizing non-constant frequency switching regulators with a phase locked loop
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Abstract
Methods for synchronizing non-constant frequency switching regulators with a phase locked loop are disclosed. The methods enable non-constant frequency switching regulators to be synchronized with a phase locked loop to achieve constant frequency operation in steady state while retaining the advantages of non-frequency operation to improve transient response and operate over a wider range of duty cycles. In addition, the methods enable multiple non-constant frequency regulators to be synchronized and operated in parallel to deliver higher power levels to the output than a single switching regulator.
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Citations
58 Claims
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1. (Cancelled)
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2. (New) A method for synchronizing a non-constant frequency switching regulator that generates a regulated voltage output at an output node, the method comprising:
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providing a source voltage at an input node;
providing control circuitry coupled to the output node that controls the duty cycle of the switching regulator; and
providing a phase locked loop having an input for receiving a clock signal and an output at which a signal is generated to control a parameter of the switching regulator, the phase locked loop adjusting the switching frequency of the switching regulator through control of the parameter. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. (New) A method for synchronizing a plurality of non-constant frequency switching regulators, the method comprising:
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providing a source voltage at a plurality of input nodes;
providing a regulated voltage at a plurality of output nodes;
providing control circuitry coupled to the plurality of output nodes to control the duty cycles of the plurality of regulators; and
providing a phase locked loop having an input for receiving a clock signal from a first switching regulator selected from the plurality of switching regulators and an output at which a signal is generated to control a parameter of a second switching regulator, the phase locked loop adjusting the switching frequency of the second switching regulator through control of the parameter. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. (New) A method for adjusting the switching frequency of a non-constant frequency switching regulator, the method comprising:
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providing a one shot timer in the switching regulator to control the duty cycle of the switching regulator;
providing a phase locked loop connected to the one shot timer to control a parameter of the one shot timer, causing the switching frequency of the switching regulator to be adjusted through control of the parameter. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. (New) A circuit for adjusting the switching frequency of a non-constant frequency switching regulator having a one shot timer to control the duty cycle of the switching regulator, the one shot timer coupled between an input voltage and a regulated output voltage, the circuit comprising:
a phase locked loop connected to the one shot timer to control a parameter of the one shot timer, causing the switching frequency of the switching regulator to be adjusted through control of the parameter. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. (New) A circuit for synchronizing a plurality of non-constant frequency switching regulators, each switching regulator from the plurality of switching regulators having a one shot timer to control the duty cycle of the switching regulator, the one shot timer coupled between an input voltage and a regulated output voltage, the circuit comprising:
a phase locked loop coupled between the one shot timer of a first switching regulator and the one shot timer of a second switching regulator selected from the plurality of switching regulators, the phase locked loop receiving a clock signal from the one shot timer of the first switching regulator and generating an output signal to control a parameter of the second switching regulator, the phase locked loop adjusting the switching frequency of the second switching regulator through control of the parameter. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
Specification