TPS1641: TPS16411DRCR FLT analysis

Huiwon Song

Part Number: TPS1641
Other Parts Discussed in Thread: IWR1843,

Hello, this is Song Hee-won from Model Cooperation.

I need your help to analyze the TPS16411 circuit.

We designed it using TPS16411 for RADAR POWER control of our RADAR ECU.
I then referenced the 'TI CALCULATION TOOL' for the RC parameters.
(My radar uses IWR1843 (TI MMIC) and LP87702D (TI PMIC).)

I think the TPS16411 circuit has enough room, but FTL occurs within seconds to minutes when the RADAR UNIT operates.
We also changed the RC parameters of PLIM and IOCP sufficiently. However, I cannot confirm valid results.

Please check the attached PDF file.

TPS16411DRCR FLT analysis.pdf

And I am currently doubting whether the problem is 'In to OUT Short detection' and would like a detailed explanation on this part. I would like to know what 'Switching freaquency' mentioned in the data-sheet means.

over 1 year ago

0 Kunal Goel over 1 year ago

TI__Guru* 79021 points

Hi Huiwon,

I will get back by monday on this.

Regards

Kunal Goel

0 Kunal Goel over 1 year ago in reply to Kunal Goel

TI__Guru* 79021 points

Hi Huiwon,

Thanks for reaching out. You mean to say FLT goes low after some time of power on and FLT once goes low it stays low?

Regards

Kunal Goel

0 Huiwon Song over 1 year ago in reply to Kunal Goel

Prodigy 10 points

Hi Kunal Goel,

Thank you for your response.

That's right. Additionally, when Low-TLF occurs, the output of the TPS16411 is blocked. And even if you change Enable from Low to High, the output is still blocked. In order for the output and FLT to become normal, the power of TPS16411 must be changed from Off to On.

Regards

Huiwon Song

0 Kunal Goel over 1 year ago in reply to Huiwon Song

TI__Guru* 79021 points

Hi Huiwon,

Looks like device is detecting IN to OUT short. You will need try using variant without IN-OUT short detection.

Regards

Kunal Goel

0 Huiwon Song over 1 year ago in reply to Kunal Goel

Prodigy 10 points

Hi Kunal Goel,

Thank you for your response.

I requested some sample on TPS16415 to agency(ARROW KOREA) and bought TPS1641EVM.

I will try to replace test on 'TPS16411 to TPS 16415'.

So, I would like to know the verification method and related operating principle of 'IN to OUT Shot detection' in TPS16411.

Regards

Huiwon Song

0 Kunal Goel over 1 year ago in reply to Huiwon Song

TI__Guru* 79021 points

Hi Huiwon,

Good to know you have ordered samples and EVM. TPS16411 and TPS16415 are pin to pin so you simply need to just swap on EVM.

Regards

Kunal Goel

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TPS1641: TPS16411DRCR FLT analysis