Adaptive drive strength switching converter
AssigneeTexas Instruments Incorporated
InventorsShailendra Kumar BARANWAL, William Todd HARRISON, Yogesh Kumar RAMADASS
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Abstract
In an embodiment, an adaptive drive strength switching converter includes a driver and a control loop coupled to the driver. In an embodiment, the control loop includes a peak detector, a comparator coupled to an output of the peak detector, a counter coupled to an output of the comparator, and a digital-to-analog converter (DAC) coupled to an output of the comparator.
Claims20
An adaptive drive strength switching converter, comprising:
- a driver having an input and an output;
- a half-bridge circuit having an input and an output, the input of the half-bridge circuit coupled to the output of the driver;
- a control loop coupled to the driver, the control loop comprising:
- a peak detector having an input and an output, the input of the peak detector coupled to the output of the half-bridge circuit, the peak detector configured to generate a detected peak value at least partially based on the output of the half-bridge circuit;
- a comparator having an input and a comparator output, the input of the comparator coupled to the output of the peak detector, the comparator configured to generate a comparison result by comparing the detected peak value to a desired maximum value;
- a counter having an input and a digital count output, the input of the counter coupled to the comparator output, the counter configured to modify the digital count output according to the comparison result;
- and a digital-to-analog converter (DAC) having a digital input and an analog output, the digital input coupled to the digital count output, the DAC configured to convert the digital count output to an analog signal at the analog output;
- and
- a measurement circuit coupled to the output of the half-bridge circuit, the measurement circuit configured to determine the desired maximum value at least partially based on the output of the half-bridge circuit.
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A control loop, comprising:
- a peak detector having an input and an output, the input of the peak detector configured to receive a signal at least partially based on an output of a half-bridge circuit;
- a measurement circuit comprising:
- a charge pump;
- a metal oxide semiconductor field effect transistor (MOSFET) coupled to the charge pump;
- and a sample-and-hold circuit having an input and an output, the input of the sample-and-hold circuit coupled to the MOSFET, the output of the sample-and-hold circuit having a desired reference value, and the MOSFET being a replication of at least a portion of the half-bridge circuit;
- a comparator having:
- a first input coupled to the output of the peak detector;
- a second input coupled to the output of the sample-and-hold circuit;
- and a comparator output;
- a counter having an input and a digital count output, the input of the counter coupled to the comparator output.
- a digital-to-analog converter (DAC) having a digital input and an analog output, the digital input coupled to the digital count output.
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The control loop of claim 1046, wherein the measurement circuit further comprises a current source having an input and an output, the input of the current source coupled to the charge pump and the output of the current source coupled to the MOSFET and the sample-and-hold circuit.
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A method, comprising:
- receiving an output of an adaptive drive strength switching converter;
- determining a maximum value of the output of the adaptive drive strength switching converter;
- comparing the maximum value of the output of the adaptive drive strength switching converter to a reference value to generate a comparison result;
- modifying a digital count value based on the comparison result;
- converting the digital count value to a signal at least partially usable to drive a component of the adaptive drive strength switching converter, wherein the component at least partially produces the output of the adaptive drive strength switching converter;
- and
- determining the reference value by pushing a metal oxide semiconductor field effect transistor (MOSFET) to operate in a breakdown operation region.
Dependencies are inferred from the claim text.