TL1451A: Recommended resiter value

Hi Jack,

Thanks for using E2E! Please give us some time to look into this and back to you. Thank you. 

Hello Brigitte,

I have checked the document you mentioned. I understand that the divider resitors should be at least10kohm.
Since there is no upper limit specified, using 100kohm is not very bad, but the tens of kohm range would be a safe choice.

Is this understanding correct?
Thanks,

Hi Jack,

You can just use the calculation tools send by Brigitte to input your application specifications in ''Input Sheet'' and the expected device performance, you can then see the recommended R1-R4 value directly. Thanks. 

TL1451CALC Calculation tool | TI.com

Hello Alicia,

Because our product is a Flyback topology and unique application, the calculation tool you provided is not suitable for our application.

I have another question, in the datasheet "recommended operating conditions", specifies "Feedback resistor, RF: 100kohm MIN. ".
Which resistor is Feedback resistor of RF? Can you tell me which resistor number in the calculation tool?

Thanks

Hello Jack,

RF is the resistor used for measuring the open loop amplification of the error amplifier. But I need to check how the circuit for this measurement looks like to understand which one this is.

Best regards,
Brigitte