LAUNCHXL-F280025C: Tida-010062 SFRA Bode Plot Curve issue

Hi Cherry, 

The subject matter expert is out of office this week. Please expect delay in response. 

Regards, Santosh

Hi Cherry,

Is your customer following the SFRA setting in the user guide/code in SDK? The injected amplitude is different from what's on Figure 3.16 in the user guide.

Please follow the settings in the SDK release.

https://www.ti.com/lit/ug/tiduet7e/tiduet7e.pdf?ts=1670357950207&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FTIDA-010062

Thanks,

Qing

Hi Qing,

Thanks for your support.

Qing Ye said:

The injected amplitude

What exactly does the injection amplitude refer to?

The input voltage during the test was around 90V and did not reach 220V in the user guide, other than that the setup was the same.

Thanks and regards,

Cherry

Cherry,

The fundamental of SFRA can be found below. It is a small signal injection on top of the the circuit behavior. The injected small signal magnitude in your screenshot is 0.01, while in Figure 3-16 of user guide, it is 0.02. The injected magnitude would affect the sweeping results, along with the circuit operating point and tolerance.  I am not sure if there is other difference in terms of code.

Hardware-wise, is your customer using our hardware or there own one? Actually regardless, it is better to let them follow the user guide exactly at the described test condition (voltage / power level). 

https://www.ti.com/lit/ug/spruhz5a/spruhz5a.pdf?ts=1670511005531&ref_url=https%253A%252F%252Fwww.google.com%252F

Thanks,

Qing