Method and system for dc-dc voltage converters
AssigneeIntersil Americas Inc.
InventorDaniel CHIENG
Life of this patent
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Abstract
On embodiment pertains to an apparatus including a control loop configured to receive an output voltage sense signal. The control loop includes a compensator; a PWM signal generator coupled to an output of the compensator; a reference circuit configured to receive a tracking signal, and which is configured to low bandwidth low pass filter the tracking signal when the tracking signal amplitude becomes substantially constant and representative of an output voltage that is substantially non-zero, and an error amplifier having a first input coupled to an output of the reference circuit, a second input configured to receive the output voltage sense signal, and an output coupled to the compensator.
Claims20
An apparatus for converting a DC input voltage to a DC output voltage, the apparatus comprising:
- an error amplifier having a first input coupled to a reference signal, a second input configured to receive a feedback signal representing the output voltage, an output of the error amplifier being used to control generation of a pulse width modulation (PWM)signal for a power stage of the apparatus;
- and
- a reference circuit configured to receive a tracking signal, and which is configured to reduce noise in the tracking signal when the tracking signal amplitude becomes substantially constant and representative of the output voltage being substantially non-zero, the reference circuit further configured to output the reference signal based on the tracking signal.
A method for operating a DC-DC voltage converter, comprising:
- determining whether a tracking signal has entered steady state, and an output voltage of the DC-DC voltage converter is substantially non-zero;
- if the tracking voltage has entered steady state and an output voltage is substantially non-zero, then reduce noise in the tracking signal;
- and
- controlling a power phase of the DC-DC voltage converter based on a difference between amplitudes of the noise-reduced tracking signal and a signal representative of the output voltage.
Dependencies are inferred from the claim text.