资 源 简 介
Abstract: This tutorial discusses methods for digitally adjusting the output voltage of a DC-DC converter. The digital adjustmentmethods are with a digital-to-analog converter (DAC), a trim pot (digital potentiometer), and PWM output of a microprocessor.Each method is assessed and several DACs and digital potentiometers presented.
There are many portable applications that optimize circuit performance by adjusting the output voltage of a DC-DC converter. Forinstance, many microprocessors can operate at a low voltage to save power, and then operate at a high voltage for increasedprocessing power. Switching between these operating modes requires adjusting the output voltage of a DC-DC converter. Anotherexample is an LCD display; as its temperature changes, the voltage applied to it must change to maintain the correct contrast ratio.
