DC/DC converter input voltage for change after the effective output voltage converter fixed voltage. DC/DC converter is divided into three categories: pressurization type DC/DC converter, step-down type DC/DC converter and lift pressed DC/DC converter. According to customer needs can use three control. PWM control type high efficiency and good output voltage ripple and noise. PFM control type even long time use, especially small load the advantages of a small power consumption. PWM/PFM transformational small load, and implement PFM control in the re-load PWM control when the automatic conversion.

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