TPS53355: What will happen when I remove RF resistor after startup?

Jan Bob

Part Number: TPS53355

Hi Experts,

We want to know what will happen when I remove RF resistor after startup(soft-start finished)?

Original RF is 866K and we remove it when buck operates in steady static.

TPS53355 will shutdown or keep work and just change Fsw?

0 Yuchang Zhang over 5 years ago

Hi, will check with team and give you feedback tomorrow.

Yuchang

0 Gerold Dhanabalan - Online Design Tools over 5 years ago in reply to Yuchang Zhang

Hi,

Can I know the use case to change the RF resistor on-the-fly?

Regards,

Gerold

0 Jan Bob over 5 years ago in reply to Gerold Dhanabalan - Online Design Tools

Hi Gerold,

Actually, there is a risk that will hit and damage this RF resistor.

So I want to evaluate its failure mode.

According to datasheet described, switching frequency is detected and stored during the startup.

So it will be no impact when TPS53355 in regulation and will just impact next time startup Fsw setting?

0 Gerold Dhanabalan - Online Design Tools over 5 years ago in reply to Jan Bob

Hi Jan,

Yes, the frequency setting is read and stored in the registers. So it should be impacted when the next time the device enters the startup sequence.

If you have an EVM for this device, you could quickly confirm this on the board as well.

regards,

Gerold

Power management forum