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Why is the output ripple of the circuit I designed so large? [Copy link]

As shown in the figure below, the PWM duty cycle is 50% and the magnification is 2 times. The ripple at point A is about 20mV, but the ripple at output reaches 600mV. Why is this? Thank you!

094100sm0thhg0lctevrul.png (34.06 KB, downloads: 0)

094100sm0thhg0lctevrul.png
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See how God answered   Details Published on 2020-5-15 00:30

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Too little information.

"PWM duty cycle is 50%", what is the frequency? What is the amplitude?

"The ripple at point A is about 20mV." What kind of waveform is this? Is the frequency the same as the input terminal (left end of R31)?

"The ripple reaches 600mV at output", is the frequency the same as the left end of R31, and is the waveform the same as point A?

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First observe the power supply ripple.

This post is from Analog electronics
 
Personal signature上传了一些书籍资料,也许有你想要的:http://download.eeworld.com.cn/user/chunyang
 
 
 

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See how God answered

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