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TINA/Spice/TLV171: TIDA-01371 similation issue

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Replies: 2

Views: 168

Part Number: TLV171

Tool/software: TINA-TI or Spice Models

Hi,

I have downloaded the TINA file for TIDA-01371 reference design from here:

/cfs-file/__key/communityserver-discussions-components-files/14/7455.Positive_2D00_LDO_2D00_Virtual_2D00_GND.TSC

Simulation results are the same as described in tiduci3a.pdf . However, when I change the TLV171 supply voltage (VCC) from 12V downto 5V, then simulation results are very strange to me. What should I change in the reference design in order to be able to operate the circuit with 5V supply? For some reasons this would be much more convenient for me.

Best Regards,

Mariusz Hajduk

  • Hi Mariusz,

    If you just change the supply voltage, the default VCNTRL value of 5V will cause the op-amp to hit a rail. Instead of a valid control voltage range of 0 to 12V, you now have a valid control range of 0V to 5V. Change VCNTRL to 2.5V and you'll see that the circuit works as expected.

    Best,
    Paul
  • In reply to Paul Goedeke:

    Now everything is understood. Thanks for your prompt support.

    Rgds,
    Mariusz

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