System and method for maintaining a constant output voltage ripple in a buck converter in discontinuous conduction mode
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United States of America Patent
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Jul 28, 2020
Grant Date -
Aug 17, 2017
app pub date -
May 2, 2017
filing date -
May 2, 2014
priority date (Note) -
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Abstract
The system and method creates a substantially constant output voltage ripple in a buck converter in discontinuous conduction mode by varying the on-time of a pulse width modulator (PWM) signal driving the buck converter when the buck converter is operating in discontinuous conduction mode. A first signal is generated that is a function of the switching frequency of the buck converter. This signal is low-pass filtered and compared with a second signal that is a function of the switching frequency of the buck converter when operating in continuous conduction mode and with constant PWM on-time. The output signal generated by the comparator is a signal that is equal to the ratio of the first signal and the second signal. The on-time of a voltage controlled oscillator is controlled by the output signal, the oscillator signal causing the on-time of the PWM signal to vary in a controlled fashion.
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