UC1875: UC1875输出脉冲一闪一闪

Tom Tom

Intellectual 340 points

Part Number: UC1875

Tool/software:

UC1875在开环时，输入条件：19脚三角波峰值4.1V，频率40KHz，2脚4.8V。结果其输出脉冲波形，一闪一闪的，间隔1秒左右，即1秒有1秒无。不知道是哪里的问题，是板子布的有问题还是别的原因？

拿正常的板子做对比，正常板子就是持续的输出。

4 months ago

0 Hong Huang 4 months ago

TI__Guru 59175 points

Hi,

Please provide your test circuit and the waveforms. What do you mean by "正常的板子"? If 正常的板子 is with the same device or different device? You need to make A-B-A swap test to see if this is IC issue or the board issue.

0 Tom Tom 4 months ago in reply to Hong Huang

Intellectual 340 points

已解决，布局造成的回流面过大造成的

Power management

Power management forum

UC1875: UC1875输出脉冲一闪一闪