提高频率与纹波特性的自适应导通时间控制器

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Abstract A novel and improved compensation of the internal circuit is proposed to reduce the output voltage ripple and the frequency shift of an adaptive on-time and pseudo fixed frequency controller. One method is the calibration of the internal adaptive on-time controller to enhance the stability of the switch frequency. And another, when the upper power device is on, the slope signals proportional to the switch cycle are added to the reference voltage, and then reset the slope signals on the moment the rectifier device is off to reduce the required ripple at the feedback point. With the above two technology of compensation, the characteristics of the ripple and the frequency are improved. The proposed circuit is fabricated in a single DC-DC controller based on 0.5um BCD process. The test results show that the fixed system switch frequency is 400kHz within 5% changed. Also, the rising and falling overshoot are less than 70mV with the output current from 0 to 6A, and the ripple is less than 20mV in the normal operation.

Key words： Power management adaptive on-time slope control load transient

Received: 11 March 2010 Published: 07 March 2014

PACS:

TN432

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	Guo Zhongjie
	Liu Youbao
	Wu Longsheng

Cite this article:

Guo Zhongjie,Liu Youbao,Wu Longsheng. An Adaptive On-Time Controller with Improved Characteristics of Frequency and Ripple[J]. Transactions of China Electrotechnical Society, 2011, 26(9): 190-195.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2011/V26/I9/190

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