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US 7,888,921 B2Granted
Switching power supply controller with high frequency current balance
AssigneeSemiconductor Components Industries, LLC
InventorsDavid A. Tobin, Xiaogang Feng, Tod F. Schiff
Life of this patent
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Abstract
A controller for a multi-phase switching power supply shuffles the sequence of the phases in response to a load transient to prevent synchronization of one or more phases with high-frequency load transients. The sequence may be shuffled by varying the frequency and/or sequence of the switching control signals to introduce a random variation in the phases.
Claims15
A method of forming a power supply controller comprising:
- configuring the power supply controller to form switching control signals for a multi-phase switching power supply;
- configuring an oscillator to form a clock signal having a frequency that is used to control the switching control signals;
- and
- shuffling the sequence of the switching control signals by increasing the frequency to an increased frequency in response to a load transient and maintaining the increased frequency during the load transient.
1 more element
A switching power supply controller comprising:
- a modulation circuit to generate switching control signals for a multi-phase switching power supply;
- an oscillator having a frequency that is used to control a frequency of the switching control signals wherein the oscillator forms a clock signal having the frequency;
- and
- circuitry to shuffle the sequence of the switching control signals by varying a sequence of the switching control signals relative to each other without changing the frequency in response to a load transient.
1 more element
Dependencies are inferred from the claim text.