System and method for controlling a hysteretic mode converter
First Claim
1. A digital control loop for a switching converter, the digital control loop comprising:
- a timing measure unit having a first input coupled to a reference clock and a second input coupled to a first clock based on a switching of the switching of the converter, the timing measure unit to count a number of clock ticks of a clock signal provided by the first clock occurring during a period of time specified by a number of clock ticks of a reference clock signal provided by the reference clock; and
an on time adjust unit coupled to the timing measure unit, the on time adjust unit to adjust an on time control signal based on the count of the number of clock ticks of the first clock signal to alter a frequency of the switching.
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Abstract
A system and method for controlling a conversion frequency of a hysteretic mode voltage converter. A digital control loop comprises a timing measure unit having a first input coupled to a reference clock and a second input coupled to a clock based on a switching of the switching of the converter, and an on time adjust unit coupled to the timing measure unit. The timing measure unit counts a number of clock ticks of a clock signal provided by the clock occurring during a period of time specified by a number of clock ticks of a reference clock signal provided by the reference clock. The on time adjust unit adjusts an on time control signal based on the count of the number of clock ticks of the clock signal to alter a frequency of the switching.
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Citations
19 Claims
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1. A digital control loop for a switching converter, the digital control loop comprising:
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a timing measure unit having a first input coupled to a reference clock and a second input coupled to a first clock based on a switching of the switching of the converter, the timing measure unit to count a number of clock ticks of a clock signal provided by the first clock occurring during a period of time specified by a number of clock ticks of a reference clock signal provided by the reference clock; and an on time adjust unit coupled to the timing measure unit, the on time adjust unit to adjust an on time control signal based on the count of the number of clock ticks of the first clock signal to alter a frequency of the switching. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A switching converter comprising:
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a first energy storing device coupled to a voltage input; a second energy storing device coupled to the first energy storing device; a switch coupled to the first energy storing device, the switch to selectively couple the first energy storing device to a power rail; and a switch timing control unit coupled to the switch, the switch timing control unit configured to set a state of the switch to couple and decouple the first energy storing device to the power rail, wherein the state of the switch is based on a desired switching frequency of the switching converter, wherein the switch timing control unit comprises; a hysteretic comparator having a first input coupled to a voltage reference and a second input coupled to a load coupled to the switching converter, the hysteretic comparator to produce a signal at an output based on a relationship between voltage levels of signals at the first input and the second input; a timing loop having a first input coupled to a reference clock and a second input coupled to an output of the hysteretic comparator, the timing loop configured to determine a switching frequency of the switch changing state and to produce a control signal to set the switching frequency to be substantially equal to the desired switching frequency; and a logic unit coupled to the timing loop and to the switch, the logic unit configured to generate a signal to set a state of the switch based on the control signal. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for adjusting a switching frequency of a switching converter, the method comprising:
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counting a number of state switches of a switch in the switching converter occurring within a specified time period, wherein the number of state switches is related to the switching frequency; decreasing the switching frequency in response to a determining that the count is greater than a first threshold; increasing the switching frequency in response to a determining that the count is less than a second threshold; and maintaining the switching frequency in response to a determining that the count is between the first threshold and the second threshold. - View Dependent Claims (16, 17, 18, 19)
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Specification