TLV62569: voltage about the SW

Hello Nan,

Thank you for using E2E,

Can you please provide me the measurements of input voltage(across the device input capacitor)  and the SW node voltage using 1V/div in same scope plot.

Thank you & regards,

Moheddin.

HI Moheddin,

     The picture is shown the SW wave, and you can see measurement result marked in red which means the max voltage in wave is 5.76V.

yours

Nan

Hello Nan,

I suspect the Vin is high that's the reason I am asking VIn and SW node voltage with 1V/div to make things clear. So can you please provide me the measurements of input voltage(across the device input capacitor)  and the SW node voltage using 1V/div in same scope plot.

Thank you & regards,

Moheddin.

Hello Nan,

Do you have any updates?

Regards,

Moheddin.

Hi Moheddin,

     Thanks for your continuous support. I have sent this to customer,but the customer have not any feedback. I will check with customer tomorrow. 

yours

Nan

Okay, please update once you received the data from the customer.

Thanks & regards,

Moheddin.

HI Moheddin,

     I get the test waveform. Vin marked in blue, SW marked in orange.

yours

nan

Hello Nan,

Thank you for sharing the waveform.

Now it looks like, Vin is around 5.1V and SW the peak is around 5.4V. There should not be any concern, but just to make sure about the layout, can you please share the customer layout, sometimes the peak of SW also depends upon the SW plane area and the measurement setup.

I would recommend the tip and barrel method for the SW measurements to eliminate the extra ringing, please have a look in here - (+) How to measure ripple for better design outcomes - Power management - Technical articles - TI E2E support forums

Thank you & regards,

Moheddin.

Hi Moheddin,

     The waveform seems like the light load oscillation which is caused by the inductor and the cap of mos. Am i right?

yours

nan