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PWM CONTROL CIRCUIT FOR DC-DC CONVERTER, FLYBACK CONVERTER, AND METHOD OF CONTROLLING PWM OF DC-DC CONVERTER
PWM CONTROL CIRCUIT FOR DC-DC CONVERTER, FLYBACK CONVERTER, AND METHOD OF CONTROLLING PWM OF DC-DC CONVERTER
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机译：DC-DC转换器的PWM控制电路，反激转换器以及控制DC-DC转换器的PWM的方法
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摘要
Provided is a PWM control circuit for a DC-DC converter, flyback converter and a method of controlling a PWM of a DC-DC converter. The PWM control circuit for the DC-DC converter includes a current sensing unit configured to sense a primary-side current, a zero-current detecting unit configured to detect a zero-current from a secondary-side auxiliary winding, a time calculating unit configured to receive a main switch control signal and an output signal of the zero-current detecting unit to calculate a time from an OFF point of a main switch to a point that the secondary-side current becomes zero, and a control unit configured to receive an output signal of the current sensing unit and time information produced by the time calculating unit to calculate a secondary-side output voltage and perform PWM control with respect to the main switch according to the calculated secondary-side output voltage.
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