This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMR14010A: When the output is fully loaded at 1A, the power-up waveform has loopback

Part Number: LMR14010A

When using the LMR14010A chip to output 5V, the output is fully loaded with electronic load 1A, and the power-up waveform of the output will have a hookback greater than 1V. Neither I increased the capacitance value, used the manual reference design, or simulated it with Tina software, I could not eliminate this backlash.

Is this question related to the chip itself? How should it be solved?

  • sorry。“Whether i increase the capacitance value, use a reference design, or simulate with Tina software, i can't eliminate it.”

  • Hi

        可能是负载的原因,建议你用电子负载验证一下。

  • 你好。我之前使用的就是电子负载,还是存在这个现象。我早上请教了客服的技术工程师,因为器件手册上也有回勾现象,他说不会像我的这么明显 ,我调试之后最好只能把回勾的幅值减小到200mv左右,但是无法消除 。他建议我调试一下电感,我之前用的基本是推荐设计只修改了值,电感采用的是22uh,目前还不知道有没有效果。预估也消除不了,因为仿真的波形在1A满载下也存在小幅度的回勾。

  • Hi

        略微有一点点是可以的,datasheet提供的波形实际上也不明显。而你提供的波形是明显较大的,之前遇到类似的情况一般都是负载造成的。  如果带电子负载也这样,只能调试电路让回勾尽量小,如你上面调到200mV就比较好。