TPS54426: Vo and Vfb connection and sense point

Takashi Onawa

Part Number: TPS54426

Hi team,

One quick question, could you tell me about the connection and correct sense points of Vo and Vfb.
According to the datasheet, it requests kelvin connection for both pins and I believe that Vfb should be sensed as close to the load as possible. So I think ①&a is the best layout, is that correct?

I'm very confused because there are many different drawings in Datasheet. so Please clarify which is correct understanding.

Regards,

Takashi Onawa

over 3 years ago

0 Vincent Zhang(BSR) over 3 years ago

TI__Expert 4795 points

Hi Takashi-san,

Yes 1&a will be better. You can also refer to our recommend layout in datasheet. Thanks.

0 Takashi Onawa over 3 years ago in reply to Vincent Zhang(BSR)

TI__Genius 13200 points

hi Zhang-san,

Thanks for your prompt response on this.

OK, I understood ① is recommended, but it looks the recommended layout shows ①-b... This is background I ask this question.

Regards,

Takashi Onawa

0 Vincent Zhang(BSR) over 3 years ago in reply to Takashi Onawa

TI__Expert 4795 points

Hi Takashi-san,

Understand. The VOUT point and FB trace should be close to the node you want to regulate.

In your picture, I assume the regulated node is far away from buck output, so I suggest 1&a.

In EVM, actually the buck output and regulated node is close, I think it should be fine. But to be more accurate, it should be described as 1&a.

0 Takashi Onawa over 3 years ago in reply to Vincent Zhang(BSR)

TI__Genius 13200 points

Hi Zhang-san,

Thanks for your prompt response on this. It makes sense, I understood that it was not intended to sense near the inductor.

Regards,

Takashi Onawa

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TPS54426: Vo and Vfb connection and sense point