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PRIMARY-SIDE REGULATED MODULATION CONTROLLER WITH IMPROVED TRANSIENT RESPONSE AND AUDILE NOISE
PRIMARY-SIDE REGULATED MODULATION CONTROLLER WITH IMPROVED TRANSIENT RESPONSE AND AUDILE NOISE
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机译:具有改进的瞬态响应和音频噪声的主边调节调制控制器
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摘要
A switching mode power supply, and a primary-side controlled PFM converter using the primary-side regulated PFM controller are discussed. In present embodiment, the primary side cycle by cycle switch peak current is no longer a constant. The time detector is added to monitor the waveform of primary-side sample voltage and then generate the duty cycle. The transfer function should be selected to satisfy a specific relationship of switching frequency and switch peak current against with output loading current. The new design shows higher switching frequency but lower value of switch peak current at light load condition. This resolves the audible noise and poor transient response issue from the prior art PFM controller.
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