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Description: KA3525 Abstract：Digital control switching power supply is the use of single chip microcomputer implementation of the switching power supply output voltage settings, adjust the output voltage step, the output voltage and output current shows such as digital control. In this paper, switching power supply design of NC is composed of two parts. Switching power supply based on the PWM control part of the asymmetrical half-bridge power converter, using KA3525 generate PWM, the use of drive circuit implementation of the power conversion circuit output control. Digital control part of the D/A using Sunplus single chip microcomputer KA3525 error output of comparator reference side of the figure given, implementation of the output voltage settings, step adjust and display functions. Mature single-chip microcomputer technology with the existing switching power supply technology for easy implementation combined with digital control. Keyword：Digital control switching power supply, Asymmetrical half
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