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AUDIO FREQUENCY DEADBAND SYSTEM AND METHOD FOR SWITCH MODE REGULATORS OPERATING IN DISCONTINUOUS CONDUCTION MODE
AUDIO FREQUENCY DEADBAND SYSTEM AND METHOD FOR SWITCH MODE REGULATORS OPERATING IN DISCONTINUOUS CONDUCTION MODE
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机译:用于不连续导电模式的开关模式调节器的音频频率去噪系统和方法
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摘要
A controller for controlling operation of a switching regulator including a modulator, a discontinuous conduction mode (DCM) controller, an audible DCM (ADCM) controller, and a sub-sonic discontinuous conduction mode (SBDCM) controller. The modulator generally operates in a continuous conduction mode. The DCM controller modifies operation to DCM during low loads. The ADCM controller detects when the switching frequency is less than a super-sonic frequency threshold and modifies operation to maintain the switching frequency at a super-sonic frequency level. The SBDCM controller detects a sub-sonic operating condition during ADCM operation and responsively inhibits operation of the ADCM mode controller to allow a SBDCM mode within a sub-sonic switching frequency range. The SBDCM operating mode allows for efficient connected standby operation. The SBDCM controller allows operation to return to other modes when the switching frequency increases above the sub-sonic level.
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