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US 2004/0169550 A1Published application
Power management method and structure
AssigneeSemiconductor Components Industries, LLC
InventorsStephane Perrier, Patrick Bernard, Yves Bernard
Life of this patent
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Abstract
An multi-stage error amplifier (22) of a power management system (10) is formed to insert a zero to compensate for a high frequency pole that could cause unstable outputs at some output current levels. The error amplifier (22) includes a feed-forward block (40) that isolates the capacitor (36) from other signal paths to facilitate low noise and high efficiency operation.
Claims20
A power management method comprising:
- receiving an input signal at an input of an error amplifier wherein the input signal has an input phase and is representative of an output voltage of a power management unit;
- generating a first signal through a first signal path of the error amplifier wherein the first signal is representative of the input signal and has a first phase relative to the input phase;
- generating in parallel with the first signal a feed-forward signal that is representative of the input signal wherein the feed-forward signal has a second phase relative to the input phase;
- using the first signal and the feed-forward signal to form a compensated signal that has a third phase relative to the input phase;
- and
- using the compensated signal to drive an output device of the power management unit.
3 more elements
A method of forming a power management unit comprising:
- forming an error amplifier to have a first bandwidth that is a first frequency and to receive an input signal having an input phase that is representative of an output signal of the power management unit;
- forming the error amplifier to generate a first signal through a first signal path wherein the first signal is representative of the input signal and has a first phase relative to the input phase;
- forming the error amplifier to generate a second signal in parallel to the first signal wherein the second signal is representative of the input signal and has a second phase relative to the input phase;
- forming the error amplifier to use the first signal and the second signal to form an output signal of the error amplifier wherein the output signal has a third phase relative to the input phase;
- and
- coupling the error amplifier to drive an output device of the power management unit with the output signal.
3 more elements
A power management unit comprising:
- an output formed to have an output voltage;
- an output device coupled to drive the output of the power management unit;
- an error amplifier including a pre-amplifier having an input coupled to receive a signal representative of the output voltage and responsively form a pre-amp output signal;
- an amplifier coupled to receive the pre-amp output signal and responsively form an amplified output signal that is shifted in phase relative to the pre-amp output signal;
- a feed forward block coupled to receive the pre-amp output signal and responsively form a feed-forward output signal that is substantially not shifted in phase relative to the pre-amp output signal and coupled to sum the feed-forward output signal with the amplified output signal and form a compensated signal;
- and
- a driver amplifier coupled to receive the compensated signal and responsively drive the output device.
4 more elements
Dependencies are inferred from the claim text.