CSD19538Q2: Wrong Webench Model Qrr Value

Antonio Fadhel

Part Number: CSD19538Q2
Other Parts Discussed in Thread: TPS43060

Hi Team,

The Webench model for the CSD19538Q2 shows a Qrr of 0nC, resulting in incorrect efficiency numbers for some controller designs. Can the model be updated?:

Thanks,

Antonio

over 3 years ago

0 John Wallace1 over 3 years ago

TI__Mastermind 29525 points

Hi Antonio,

Thanks for the inquiry. I will check into this with the Webench team. I'm going to close this thread and we can communicate via regular email.

Thanks,

John Wallace

TI FET Applications

0 Shaheen Makandar over 3 years ago

TI__Intellectual 2560 points

Hi Antonio,

Thanks for the above post. We verified for one of the device and found that Qrr is getting displayed. To further look into this issue, Could you please share WEBENCH design for which Qrr is displayed as 0?

PFA the design where Qrr is displayed as 94nC:

Regards,

Shaheen S M

0 Antonio Fadhel over 3 years ago in reply to Shaheen Makandar

TI__Genius 9410 points

Hi Shaheen,

Thanks for looking into this. I will share the design. It is for the TPS43060 boost controller.

Regards,

Antonio

0 Shaheen Makandar over 3 years ago in reply to Antonio Fadhel

TI__Intellectual 2560 points

Hi Antonio,

Thanks for sharing the above information. For the above device, we are observing Qrr is getting displayed as below:

Could you please share your WEBENCH design? Please follow below steps.

1. Create the WEBENCH design and click on "Export" tab. Look for share icon just below it. Pleas click on it.

2. Click "GET LINK" from Public Link tab.

3. Share the generated link with us.

Regards,

SShaheen S M

0 Antonio Fadhel over 3 years ago in reply to Shaheen Makandar

TI__Genius 9410 points

Hi Shaheen,

I had shared it with you internally using the Webench share feature. Here is the public link: https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=FA0320DD78D4046F. On my end, M1 still shows 0nC Qrr for some reason.

Thanks,

Antonio

0 Bhushan Waghmare over 3 years ago in reply to Antonio Fadhel

TI__Expert 3320 points

Hi Antonio,

Thanks for sharing the Webench design. We should be able get back to you by next week with an update on this.

Best Regards,

Bhushan

0 Antonio Fadhel over 3 years ago in reply to Bhushan Waghmare

TI__Genius 9410 points

Thanks, Bhushan. I am looking forward to your feedback.

Regards,

Antonio

0 Shaheen Makandar over 3 years ago in reply to Antonio Fadhel

TI__Intellectual 2560 points

Hi Antonio,

We were able to identify the cause for this issue. We are observing that for few of the MOSFETs, Qrr is entered as 0 in our database which was somehow affecting your WEBENCH design. We are working on fixing this issue and we will get back to you by next week.

Regards,

Shaheen S M

0 Antonio Fadhel over 3 years ago in reply to Shaheen Makandar

TI__Genius 9410 points

Great! Thanks for the update, Shaheen!

0 Shaheen Makandar over 3 years ago in reply to Antonio Fadhel

TI__Intellectual 2560 points

Hi Antonio,

We have updated the WEBENCH model for the device to select MOSFET's with non zero Qrr value in the database. The Update will be available on ti.com by next WEBENCH release(Tentatively by Mid April).

Regards,

Shaheen S M

Power management

Power management forum

CSD19538Q2: Wrong Webench Model Qrr Value