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Rapid Dynamic Response Flyback AC-DC Converter Design
Changyuan Chang¢Ó, Menglin Wu*, Luyang He*, and Dadi Zhao*
Abstract A constant voltage AC-DC converter based on digital assistant technology is proposed in this paper, which has rapid dynamic response capability. The converter operates in the PFM (Pulse Frequency Modulation) mode. According to the load state, the compensation current produced by the digital compensation module was injected into the CS pin to adjust the switching pulse width dynamically and improve the dynamic response. The control chip is implemented based on NEC 1¥́m 5V/40V HVCMOS process. A 5V/1.2A prototype has been built to verify the proposed control method. When the load jumps from idle to heavy, the undershoot time is only 7.4ms.
Keyword Constant voltage, PFM mode, Rapid dynamic response
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