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Switching power supply 3.3V 2A production [Copy link]

The power adapter is 3.3V 2A. It is rare to make this type of power adapter. However, after making it, it is found that the no-load loss is very large and the overall efficiency is very low. The dummy load uses 0805, and the loss of 120R reaches 0.47W. If the dummy load is adjusted higher, it is almost unstable. How to adjust it? Is there any master who can give me some guidance?
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The power adapter needs to be 3.3V 2A, which depends on how high the voltage is dropped to 3.3V.  Details Published on 2018-7-1 11:30
 
 

1w

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Give a specific circuit.
This post is from Power technology
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
 
 
 

2w

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The power adapter needs to be 3.3V 2A, which depends on how high the voltage is dropped to 3.3V.
This post is from Power technology
 
 
 

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