发明授权
US07439720B2 Constant-peak-current minimum-off-time pulse frequency modulator for switching regulators
有权
用于开关稳压器的恒峰值电流最小关断时间脉冲频率调制器
- 专利标题： Constant-peak-current minimum-off-time pulse frequency modulator for switching regulators
- 专利标题（中）： 用于开关稳压器的恒峰值电流最小关断时间脉冲频率调制器
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申请号： US11509908申请日： 2006-08-25
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公开(公告)号： US07439720B2公开(公告)日： 2008-10-21
- 发明人: James H. Nguyen , Thomas T. Chiang , Christopher T. Falvey
- 申请人： James H. Nguyen , Thomas T. Chiang , Christopher T. Falvey
- 申请人地址： US CA San Jose
- 专利权人： Monolithic Power Systems
- 当前专利权人： Monolithic Power Systems
- 当前专利权人地址： US CA San Jose
- 代理机构： Perkins Coie LLP
- 代理商 Zhou Lu
- 主分类号： G05F1/575
- IPC分类号： G05F1/575 ; G05F1/62
摘要：
Methods and apparatus are disclosed for controlling switching regulators to automatically switch from a traditional pulse-width modulation (PWM) mode, when the load current is higher than a predetermined value, to a pulse-frequency modulation (PFM) mode, when the load current drops to a point lower than the predetermine value. Switching modes increases the efficiency of the regulator when the load current is low without provoking a large output voltage transient. In some embodiments, a single switching cycle regulates the output in the PFM mode, which reduces the switching losses and enhances the efficiency of the regulator.
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