TPS62913EVM-077: layout question for routing VO pin

Hans

Part Number: TPS62913EVM-077
Other Parts Discussed in Thread: TPS62913

Tool/software:

Hello Team,

the EVM shows a thin trace from VO-pin to Vout. According TPS62913 data sheet VO needs to be connected directly after the first inductor. But to measure Vout it should be connected to the last capacitor, close to Vout?

I guess VO-pin is high impedance and susceptible for noise, correct? Or is there any other consideration?

Thank you and Best Regards,

Hans

over 1 year ago

0 Lucia Gao over 1 year ago

TI__Mastermind 30451 points

Hi Hans,

We would recommend to make the VO pin trace short and direct to the output capacitor. That's the reason why TPS62913 data sheet VO needs to be connected directly after the first inductor.

BRs

Lucia

0 Hans over 1 year ago in reply to Lucia Gao

TI__Genius 12865 points

Hi Lucia,

I don't understand. There is no VOS pin... or do you mean VO pin?

Thank you, Hans

+1 Lucia Gao over 1 year ago in reply to Hans

TI__Mastermind 30451 points

Yes, I mean VO pin. Sorry for inconvenience.

0 Hans over 1 year ago in reply to Lucia Gao

TI__Genius 12865 points

Hi Lucia, one more question:

In the eval board, seems like the copper pouring is kept away from this VO pin. Why is the trace thin in this case? Can it be a fat copper area covering the indicated area?

And what about the function of VO input? Specifically, how it is used in this filter compensation? Would like to understand more on this because it is not common (like the feedback input).

Thank you and Best Regards, Hans