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TPS62175EVM-098 output current

Roman Stampfli
Prodigy 20 points
Other Parts Discussed in Thread: TPS62175EVM-098, TPS62175, TPS62172, TPS62150A

Hello

I am evaluating the TPS62175EVM-098, which should have a 3.3V fixed output voltage with 500mA max. current. The input voltage was 12-13.8V.

Using a 10 Ohm load the output voltage is still pretty near to the open loop voltage.

I was then trying to get near 500mA output current, but with a load of 7.5 Ohm the output voltage drops down to 2.7V. Did anyone have the same experience with the TPS62175? It does not seem to be very reliable.

Thanks

Roman

  • 0
    TI__Guru**** 150950 points
    Did you attach the load and then enable the IC? 7.5 Ohm is likely too small to start into, but if you add it after you start it should work. See section 8.4.1 in the D/S.

    But if you only need 12Vin, the TPS62172 or TPS62150A may be worth looking at.
  • 0 in reply to Chris Glaser
    Prodigy 20 points
    Thank you very much. That was it! I was starting the IC in open loop and then attached the load. When attaching a 500 Ohm load and then the 7 Ohms it works fine. So I have just to keep the soft start in mind for the turn on scheme.

    I am going to check the other ICs as well.