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Generally speaking, Hysteretic control mode has a disadvantage in that its voltage ripple is bigger than that of conventional control mode. Panasonic has succeeded in solving this general problem by utilizing their original technology. In hysteretic mode control DC-DC converters, the voltage ripple is caused mainly by feedback voltage that is affected by noise generated in the LX terminal. If the noise is put on feedback voltage when it was at the same level as the reference voltage, switching becomes unstable. Feedback voltage is changed by noise and the voltage level could rise and fall faster than reference voltage, which could turn on the switch when the switch has to be turned off, or vise versa. Panasonic solved this problem by adopting ramp waveforms in reference voltage that can ensure the margin against noise on feedback voltage. They have succeeded in getting rid of malfunctions caused by noise on feedback voltage, and the ripple achieved at the level of conventional control mode.
PTM Published on: 2013-03-14
