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TPS82140: Schematic verification of the switching regulators of TPS family

Binayak Shrestha88
Expert 1520 points
Part Number: TPS82140
Other Parts Discussed in Thread: TPS82130, TPS51200,

Hi TI team,

I'm using the following switching regulators of TPS family in our upcoming board.

(1) TPS51200: 0.75V VTT Termination and Vref

(2) TPS82140: 1.5V@2A

(3) TPS82140: 2.8V@2A

(4) TPS82130: 3.3V@3A

Kindly verify the attached schematics for the above circuits.


Thanks and Regards,
BinayakTPS_family_switchers.pdf

  • 0
    TI__Guru**** 191445 points

    Binayak,

    We do not have any concerns with your TPS82130 and TPS82140 schematics.  TPS51200 is supported by a completely different group and they will not see your post here.  Can you please make a separate post with your TPS52100 request?  Thanks.

  • 0 in reply to JohnTucker
    Expert 1520 points

    Hi John,

    I was going through the datasheet of TPS82140 and TPS82130 and comparing the Vout obtained from the web bench and the following equation provided in the datasheet for both the regulators:

    Vout = 0.8V x (1+ Rft/Rfb)

    If I try to put the values provided by the web bench into this equation, I get:

    (1) For TPS82140 (1.5V@2A) -- Vout = 0.8V (1+86.6k/100k) = 1.493V

    (2) For TPS82140 (2.8V@2A) -- Vout = 0.8V (1+249k/100k) = 2.792V

    (3) For TPS82130 (3.3V@3A) -- Vout = 0.8V (1+309k/100k) = 3.272V

    In all of the above cases, Vout is less than the that provided in the datasheet. Are the web bench Rft values okay or do I need to increase them to increase the Vout?

    Thanks and Regards,

    Binayak

  • 0 in reply to Binayak Shrestha88
    TI__Guru**** 191445 points

    Binayak,

    Those resistor values are the closest standard E96 values.  Taking the 1.5 V for example, using 86.6 k gives 1.493 V (-0.007 V).  Changing to the next higher value of 88.7 k gives 1.5096 V (+0.0096 V), so the 86.6 k results in a closer voltage to the target point.  Ig you need extra accuracy, you can use two resistors in series for Rtop.  Otherwise, just use the results calculated by Webench.