TPS23755：RSRF, RSRR rated power and transformer

user5397266

Part Number: TPS23755

Dear Team

I have two questions.

①　Is the rated power of RSRF and RSRR 1 / 16W sufficient?　I don't think it needs a large rated power because it drives the FET Gate.

②　When asked about alternative transformers, you answer, "The two recommended transformers are specially designed."
　　What are the specific characteristics of them?
　　Detailed information is needed to select a replacement.

Thanks in advance

over 3 years ago

0 Penny Xu over 3 years ago

TI__Genius 15685 points

Hi,

We highlight recommend you using the same transformer as on our EVM and reference designs as these are custom made by the transformer vendor with optimized performance. Are you seeing any supply issues with the approved transformer?

Best regards,

Penny

0 user5397266 over 3 years ago in reply to Penny Xu

Prodigy 230 points

Penny

Yes, I am asking because there is a supply problem.
The answers to the other questions didn't tell me exactly what was different from the other transformers.
Should I match the inductance? DCR? Turns ratio?

Also, please answer ①.

0 Penny Xu over 3 years ago in reply to user5397266

TI__Genius 15685 points

Yes. Please match all these specs to ensure the best performance. I still don't recommend picking random transformers other than the custom parts listed on our BOM(LDT0950-50 and 750317728) since they are tested and proved on our EVM. Thanks.

Best regards,

Penny

0 user5397266 over 3 years ago in reply to Penny Xu

Prodigy 230 points

Penny

Please answer the questions in (1).

Is 1/16W sufficient power rating for the resistor circled in red in the diagram below?
Since EVM has variable resistors on it, I do not know the proper power rating.

0 Penny Xu over 3 years ago in reply to user5397266

TI__Genius 15685 points

Hi,

Our EVM uses 1/4W resistors. It would good to follow that. Thanks.

Best regards,

Penny

Power management

Power management forum

TPS23755：RSRF, RSRR rated power and transformer