发明授权
US08193798B1 Buck regulators with adjustable clock frequency to achieve dropout voltage reduction
有权
降压稳压器可调节时钟频率，实现压降降压
- 专利标题： Buck regulators with adjustable clock frequency to achieve dropout voltage reduction
- 专利标题（中）： 降压稳压器可调节时钟频率，实现压降降压
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申请号： US12608676申请日： 2009-10-29
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公开(公告)号： US08193798B1公开(公告)日： 2012-06-05
- 发明人: W. David Pace , Robert H. Bell , Steven L. Harris
- 申请人： W. David Pace , Robert H. Bell , Steven L. Harris
- 申请人地址： US TX Dallas
- 专利权人： Texas Instruments Incorporated
- 当前专利权人： Texas Instruments Incorporated
- 当前专利权人地址： US TX Dallas
- 代理商 Wade J. Brady, III; Frederick J. Telecky, Jr.
- 主分类号： G05F1/00
- IPC分类号： G05F1/00
摘要：
A method includes generating a drive signal for a transistor in a switching regulator. The drive signal turns the transistor on and off to generate a regulated output voltage. The drive signal is generated based on a clock signal. The method also includes dynamically decreasing a frequency of the clock signal to decrease a dropout voltage of the switching regulator. Dynamically decreasing the frequency of the clock signal can increase a duration of switching periods defined by the clock signal. The dropout voltage could have a first value proportional to TOFF—MIN/TON—MAX during shorter switching periods and a second value proportional to TOFF—MIN/TON—MAX—DFC during longer switching periods. TOFF—MIN represents a minimum amount of off-time for the transistor during each switching period, TON—MAX represents a maximum amount of on-time for the transistor during shorter switching periods, and TON—MAX—DFC represent a maximum amount of on-time for the transistor during longer switching periods.
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