Slope Compensation with Adaptive Slope
AssigneeDialog Semiconductor (UK) Limited
InventorHirohisa Tanabe
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Abstract
The disclosure provides for a slope voltage compensation circuit with an adaptive slope compensation method, in a DC-DC switching converter operating in current control mode, at duty cycles greater than 50%. The proposed solution allows for the dynamic range of useful operation to be extended, lowering the slope voltage compensation at the beginning of the cycle, and then increasing the compensation as 50% duty cycle is achieved. This method is based on voltage control instead of time, and a second phase of a clock is not required.
Claims20
A slope compensation circuit, in a DC-DC switching converter, comprising:
- a first capacitor coupled to a current source, wherein said current source is configured to provide a charge current;
- a second capacitor coupled to said first capacitor via a first transistor, wherein said first transistor comprises a drain coupled to said first capacitor, a source coupled to said second capacitor and a gate coupled to a reference voltage;
- and
- a switch, connected across said first capacitor, configured to create an adaptive slope on a voltage compensation signal.
A method for adaptive slope compensation, in a DC-DC switching converter, comprising:
- providing a slope compensation circuit, comprising a first capacitor coupled to a current source, and a second capacitor coupled to said first capacitor, via a transistor, wherein said transistor comprises a drain coupled to said first capacitor, a source terminal coupled to said second capacitor and a gate coupled to a reference voltage;
- creating a compensation signal, comprising a first linear portion having a first slope, and a second linear portion having a second slope;
- using a voltage to control said first and said second slopes;
- and
- wherein said first slope is less than said second slope.
Dependencies are inferred from the claim text.