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TPS7A39: Recommended Feedback Resistors for +/-2.5V

Noriyuki Takahashi
Genius 11000 points
Part Number: TPS7A39

Hi team

I am modifying TPS7A39 evm and want to understand the recommended feedback resistors from E24 series resistors for +/-2.5V +/-1%.

Now, R1P = 11kOhm, R2P = 10kOhm, R1N = 10kOhm, R2N = 6.19kOhm are being populated. I mean, R1P, R2P, R1N, R2N are come from figure 65 on the datasheet. Are these values no problem in terms of the recommended resistors value range? I am just worried about these values are partly different with the recommended values in the datasheet.

Regards,

Noriyuki Takahashi

  • 0
    TI__Guru 55940 points

    Hi Noriyuki,

    Your positive channel will yield 2.5 V and is the recommended resistor values; however, your negative channel will not yield -2.5 V with your resistor divider.  Please keep in mind that due to topology, the positive and negative outputs are calculated slightly differently:

    Very Respectfully,

    Ryan