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TPS62113: TPS62113 VALUES AT 12V

johntse tse
Prodigy 40 points
Part Number: TPS62113

IN THE DATASHEET, COMPONENT VALUES ARE GIVEN UP TILL 9V BUT SPEC SAYS IT CAN WORK UP TO 16V OUTPUT

ALTHOUGH I CAN CALCULATE IT, 

I WOULD LIKE TO KNOW WHY 12V OUTPUT WHICH IS A VERY COMMON OUTPUT VOLTAGE IS NOT INCLUDED

ARE THERE SOME CONSTRAINTS?

MY DESIGN HAS A 15V 2A INPUT AND I NEED A 12V 1A OUTPUT WITH A 6.8UH INDUCTOR THAT CAN OPERATE UP TO 1MHZ AND 1x 0.1uF CERAMIC + 2x 22uF MULTILAYER SMT CAPS

PLEASE ALSO GIVE ME THE VALUE FOR Cff OR CAN IT BE OPTIONAL LIKE THE FIXED VOLTAGE VERSION.

WHY IS THERE NO SIMULATOR OPTION FOR THIS PART?

THANKS

JOHN

  • 0
    TI__Mastermind 23110 points

    Hi John,

    This is a relatively old part so I do not have complete history on why 12V output was not included in the datasheet design section. But TPS62113 should work for 12V Vout. The 6.8uH inductor with 0.1uF ceramic + 2x22uF output cap combination works fine. The feedforward cap is optional but a 22pF cap can be used for this higher output voltage design. There is a PSPICE model for this part available at https://www.ti.com/product/TPS62113#design-development 

    Thanks,
    Amod

  • +1 in reply to Amod Vaze
    Prodigy 40 points

    dear Vaze

    thank you so much for your quick response, much appreciated

    I had to use this part because it is the only few available parts ex-stock from TI and I already was using the 3.3v version before

    I have always been using a lot of other TI SMPS ICs but now, mostly due to being "out of stock",  for the first time, I am forced to use other suppliers 

    I do not need a PSPICE model, please just give me the R1 and R2 values for 12V exactly 

    based on the formulas, the best I could do was R1 =  680K 1% ( 680100 ) and R2 = 715K 1% ( 71500 ) with VO = 12.12

    please do advise

    john

  • +1 in reply to johntse tse
    TI__Mastermind 23110 points

    Hi John,

    Yes lately there are lot of supply issues. The R1/R2 you picked should work just fine. If you want more accurate VOUT (closer to 12V), you can use two series resistors for the top FB resistor like 649kohm+23.7kohm and a 71.5kohm bottom resistor which should yield exactly 12V.

    Thanks,

    Amod