LDC5072-Q1: Issue with the excitation signal of the LDC5072

?? ?

Part Number: LDC5072-Q1

I am currently working on a project involving the LDC5072, with self-designed PCB. In the excitation coil, a excitation signal is present for only half of the time within every 15ms, while the other half of the time is maintained at an almost constant level. The frequency of the excitation signal is 4MHz.

LCIN and LCOUT is grounded through a 1nF capacitor. The inductance of excitation coil is about 5.2 μH, and more detailed parameters calculated by DesignTools are shown in the picture below. AGC_EN is selected.

Could you please provide some guidance on what might be causing this issue?

Thank you for your time and assistance. I look forward to your response

我目前正在从事一个涉及LDC5072的项目，使用的是自己设计的PCB。在激励线圈中，每15ms内只有一半时间有激励信号，另一半时间保持为几乎不变动的电平。发射信号的频率为4MHz。

LCIN和LCOUT通过1nF的电容接地。线圈是使用LDC5072设计软件设计的，激励线圈的电感为5.2μH，在下图中有更多的参数。AGC_EN打开了。

能否提供一些关于可能是什么原因导致这个问题的指导？

感谢您们抽出时间并提供帮助。期待您的回复。

5 个月前

0 Eirwen 5 个月前

TI__Mastermind 24435 points

已经收到了您的案例，调查需要些时间，感谢您的耐心等待。

+1 Lydia 5 个月前

TI__Mastermind 29315 points

Hi，

The device appears to be going into fault. Have they measured the resonant frequency at 4MHz? They may want to check that to be sure it is within range of the device. The device supports 2.4MHz to 5MHz. Also, they may need to be sure that the target is placed on top of the coil to ensure this maintains the right frequency range, otherwise a fault can occur.

On the AGC_EN pin, they should only be populating R2 and R1 should be DNP for AGC mode. I usually use 2.2k ohms for R2.

Please take a look at these and let me know if it solves their issue.

0 ?? ? 5 个月前回复 Lydia

Prodigy 70 points

Thanks a lot for your help. We've found the problem is that R1 is populated rather than unpopulated by mistake. It can work well now. Thanks for your assistance

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LDC5072-Q1: Issue with the excitation signal of the LDC5072