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US 2015/0102794 A1Published application
Dc-dc converter using internal ripple with the dcm function
AssigneeTexas Instruments Incorporated
InventorJiwei Fan
Life of this patent
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Abstract
A DC-DC converter, having an input voltage and an output voltage, includes an inductor and a switch switching the input voltage to an input side of the inductor, where a feedback path controlling initiation of closing the switch includes capacitive coupling of the voltage at the input side of the inductor.
Claims3
A DC-DC converter receiving an input voltage and generating an output voltage, comprising:
- a feedback path comparing a fraction of the output voltage to a first reference voltage;
- an amplifier receiving a fraction of the output voltage and a second reference voltage, and having an amplifier output that is the difference between the fraction of the output voltage and the second reference voltage;
- a threshold circuit determining whether the magnitude of the output of the amplifier is greater than a threshold;
- an integrator integrating the output of the amplifier only when the threshold circuit determines that the magnitude of the output of the amplifier is greater than the threshold;
- and,
- an adder, adding an output of the integrator to the first reference voltage to adjust the first reference voltage.
3 more elements
A method of controlling on-time and switching frequency of a switch in a DC-DC converter, the DC-DC converter having an input voltage and an output voltage, the method comprising:
- driving, by a voltage controlled current source, a capacitance, to generate a ramp voltage, the voltage controlled current source being controlled by the input voltage to the DC-DC converter;
- comparing, by a comparator, the ramp voltage to the output voltage of the DC-DC converter;
- controlling, by the comparator, a switch control circuit to close the switch in response to a trigger signal and to open the switch when the ramp voltage is greater than the output voltage;
- detecting, by a phase detector, a difference in phase between the output of the comparator and a reference frequency signal;
- driving, by the phase detector, a current generator;
- and,
- adding the current generated by the current generator to the current generated by the voltage controlled current source.
4 more elements
Dependencies are inferred from the claim text.