发明申请
US20050258811A1 Switching regulator and method for changing output voltages thereof
有权
用于改变其输出电压的开关调节器和方法
- 专利标题： Switching regulator and method for changing output voltages thereof
- 专利标题（中）： 用于改变其输出电压的开关调节器和方法
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申请号： US11115342申请日： 2005-04-27
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公开(公告)号： US20050258811A1公开(公告)日： 2005-11-24
- 发明人: Masahiro Matsuo , Tomonari Katoh
- 申请人： Masahiro Matsuo , Tomonari Katoh
- 优先权： JP2004-131607 20040427
- 主分类号： G05F1/40
- IPC分类号： G05F1/40 ; H02M3/155 ; H02M3/158
摘要：
A switching regulator including two switching elements and a control switching part. The two switching elements perform a switching operation according to a control signal to control an output voltage. One of the two switching elements is larger in ON-resistance and smaller in control electrode capacitance than the other. The control switching part performs PFM control over the one of the two switching elements to output a first predetermined voltage in a first operation mode, performs PWM control over the two switching elements to output a second predetermined voltage higher than the first predetermined voltage in a second operation mode, and switches the first operation mode to the second operation mode by performing the PFM control, changing the first predetermined voltage to the second predetermined voltage, and switching the PFM control to the PWM control after a first predetermined time elapses since start of increase in the output voltage.
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