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The native efficiency of the Blackfin integrated approach can be improved to 90% or more by designing in a modern dc-to-dc switching converter. A variety of dynamic voltage-scaling (DVS) control schemes are available, ranging from switched resistors—which in some cases can be implemented by using a DAC—to pulse-width modulation (PWM), which can achieve as fine a granularity as the internal method. Whatever scheme used, it must provide the ability to change the regulation level via software control. While this regulation control method is inherent with the internal regulator approach, it must be added in external approaches.

PTM Published on: 2008-04-16