TPS53015: Vout noise

Roy Chou1

Part Number: TPS53015

Hi Team,

Below is my schematic, I find the Vout noise when switch is doing switching. Could you let me know the method could eliminate noise?

yellow : Vout (CO1)

red : switching node

Regards,

Roy

Hi Roy,

Just having 0.1uF on the output of the filter, seems very low,

Please try adding an additional 2*22uF to the output.

Can you please also let me know the magnitude of the noise that you are seeing on the 5V?

I see a -2.5V on the scope shot as well. Where is that being generated?

regards,

Gerold

0 Roy Chou1 over 4 years ago in reply to Gerold Dhanabalan - Online Design Tools

Hi Gerold,

We had added the 22uF*2 as C4/C5 in schematic. Do mean that we need add more cap after EMI filter may improve the noise?

The noise is around 1.5V when switch is doing switching. It's not Vout ripple.

the unit is Vout unit, you could ignore it. Red line is input current.

Roy

0 Gerold Dhanabalan - Online Design Tools over 4 years ago in reply to Roy Chou1

Hi Roy,

Can you please add more capacitance in Co1,Co2 and then check?

regards,

Gerold

Hi Roy,

As we are taking this by email, I will go ahead and close this ticket.

regards,

Gerold

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