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Figure c) shows the load current and inductor current in response to a 300-mA step decrease in load current. Finally, figure d) shows that there are no subharmonic oscillations when the part operates at a 50% duty cycle, which is a concern for parts using peak-current-mode control. This freedom from subharmonic oscillations is also the case for duty-cycle values somewhat greater or less than 50%.
PTM Published on: 2008-04-16
Hong Kong, China