TPS54360：触碰到Pin4脚(RT/CLK),芯片工作异常

XinQiang BAO

Part Number: TPS54360

Tool/software:

您好：
使用TPS54360按照datesheet中参考原理图设计 24V转5V的电路，并且Layout也按照参考设计布局，测试时手触碰到PIN4脚（RT/CLK），瞬间导致芯片工作异常，并伴随吱吱声，原因大概率是影响开关频率了。
想请教一下在原理图设计层面有没有什么办法将这种隐患优化。

期待您的回复，并再次感谢您的支持与帮助！

2 months ago

0 EricLee 2 months ago

TI__Guru 61601 points

Hello Xin

It is normal that the device switching is affected by touching the RT pin. If you'd like to reduce its sensitivity, please populate ~ 100pF in parallel with R3 and check if any improvement.

-EL

0 XinQiang BAO 2 months ago in reply to EricLee

Prodigy 10 points

Hello Lee
我尝试与R3并联~100pF/47pF/100nF都没有发现其灵敏度降低
期待您的回复，并再次感谢您的支持与帮助！

0 EricLee 2 months ago in reply to XinQiang BAO

TI__Guru 61601 points

Hello Xin

As I mentioned, it is normal that the device switching is affected by touching the RT pin. The other way is to conformal-coat PCB. Conformal-coating protects PCB and components against various environmental factors.

-EL

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TPS54360：触碰到Pin4脚(RT/CLK),芯片工作异常