[问答]

VIper16转换器出现问题

问答对人有帮助，内容完整，我也想知道答案 0 我们用Viper16进行了设计，将500V转换为12V，非隔离。我们遵循文档ST_ID15232_rev3和数据表中指出的准则。该器件具有LIM输入，用于设置限制电流。如技术文件所示，我们将LIM引脚保持打开状态，将极限电流设置为默认值。由于LIM引脚非常敏感，因此器件工作不正常。只有用手指触摸此引脚，12V输出才会下降，使输出不稳定。我们想知道是否有人有同样的问题，你是如何解决的。以上来自于谷歌翻译以下为原文 We made a design with Viper16 to convert from 500V to 12V, non isolated. We followed the guidelines indicated in the document ST_ID15232_rev3 and datasheet. This device has a LIM input, to be used for setting the limit current. We left the LIM pin open, as indicated for the technical papers, to set the limit current as default. The device is not working correctly because the LIM pin is very sensitive. Only touching this pin with the finger, the 12V output goes down, making the output unstable. We would like to know if anyone had the same problem and how did you solved. 0
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答案对人有帮助，有参考价值 0 你好我用viper16做了一个降压转换器设计，我跟着AN2872。但是我的电路不能正常工作。我想提一下我的经历; 当有任何负载且没有15V齐纳二极管且没有7805时，输出电压不断增加。当只有10k电阻时，输出电压在11V至13V之间振荡。当只有1k电阻时，输出电压在1V至4V之间振荡。我认为问题来自fb引脚，所以我测量了fb引脚的电压为0.054V。这必须是3.3 V.因此我将C8从100n增加到1u。最后C8电压增加但fb引脚的电压没有变化。（我没有组装lim电阻器）以上来自于谷歌翻译以下为原文 Hello I made a buck converter design with viper16 and i followed AN2872. However my circuit not works properly. I want to mention about my experience; When there was any load and no 15V zener diode and no 7805, output voltage increased continuously. When there is only 10k resistor, output voltage oscilatted between 11V to 13V. When there is only 1k resistor, output voltage oscilatted between 1V to 4V. I thought that the problem came from fb pin, so i measured fb pin's voltage which is 0.054V. This must be 3.3 V. Therefore i increased C8 from 100n to 1u. Finally C8 voltage increased but fb pin's voltage didn't change. (I didnt assemble lim resistor)

2018-11-15 10:58:54 评论举报孙奕