The pulse width modulation circuit

Published:2011/6/10 3:46:00 Author:Seven | Keyword: pulse width, modulation circuit | From:SeekIC

About the pulse width modulation circuit, we should first analyse the circuit. If the pulse is 3uS/5V, the normal state of Q4 is closed, and 3uS is conducting at the moment of starting to work. Therefore, Q5 is normally conducting, and closed in transiency. This seems no the same with what xbtxbt said. So after the initial analysis, the possible consequence is: 1.the working principle is wrong; 2. The circuit is drawn wrongly; 3.see as the figure, the input signal is input wrong.By the direction of diode D21, we guess that 3 may be right.Firstly, we assume that the 3 is right.



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