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DC-DC Conversion Cookbook Slide 16

This slide shows the L6928 in operation in PWM and burst modes. Between each burst of pulses the consumption is 25 µA, reducing the average power loss. As a drawback, the frequency becomes load dependent and the output voltage has a large ripple, because the regulator turns on only when the Vout falls outside of regulation to restore the set Vout. This does not happen in PWM mode where there is a clean Vout, but a continuous switching activity increases the current consumption due to switching losses.

PTM Published on: 2013-04-11