This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

  • TI Thinks Resolved

TPS73201-EP: The overcurrent limit is over spec

Prodigy 430 points

Replies: 20

Views: 6978

Part Number: TPS73201-EP

Hi expert,

      I got a feedback from customer talking about overcurrent limit of TPS73201-EP.

      In the datasheet, there is a range of it, which is 250mA ~ 600mA.

      You can see the waveform captured by customer, it is limited by 634mA which is over spec.

      Can you explain how does it happen? It is a 5V to 3.3V design.

      Thanks a lot.

Best regards, Cage.

  • In reply to Kyle Rakos:

    Hi Cage,

    What EVM specifically is the customer using? Is it for the TPS73201-EP?


    Thanks,

    Kyle

  • In reply to Kyle Rakos:

    Hi Kyle,

        Yes, TPS73201-EP, and EVM is TPS73201DRBEVM-518.

        Thank you.

    Best regards, Cage.

  • In reply to Cage Chen:

    Hi Cage,

    Did the customer replace the TPS73201 on that EVM with the -EP version? If not you may want to reach out to the commercial team. Otherwise let me know the answers to the previous questions.

    Thanks,
    Kyle
  • In reply to Kyle Rakos:

    Hi Kyle,

         Yes, customer replaced a TPS73201-EP on the EVM, which is TPS73201DRBEVM-518.

         For your reference.

    Best regards, Cage.

  • In reply to Cage Chen:

    Hello Cage,

    Understood. Please let me know if the customer has been able to measure the over current condition without the capacitor. Also please confirm the current probes have been properly calibrated.

    Thanks,
    Kyle
  • In reply to Cage Chen:

    Hey Cage,

    Was the customer able to take these measurements?

    Thanks,
    Daniel
  • In reply to Daniel Hartung:

    Hi Daniel,

         Yes, the current probe is very accurate, and even scope is very accurate.

         After they removed output cap, the overcurrent limit is just slightly reduced from 624mA to 612mA.

         Customer just needs a explanation why it is over spec.

         Thank you.

    Best regards, Cage.

    ps, Customer also mentioned one thing, if the difference between Vin and Vout is small, the current limit will be easy to over 600mA, if it is big, the current limit will be about 580mA or smaller.

  • In reply to Cage Chen:

    Hey Cage,

    Please show the customer footnote one in the datasheet for the table.

    (1) Minimum VIN = VOUT + VDO or 1.7 V, whichever is greater

    Have their tests been with <1.7 V between Vout and Vin?

    Thanks,

    Daniel

  • In reply to Daniel Hartung:

    Hi Daniel,

         Yes, Vin=3.3V, Vout=3V.

         So the datasheet should need to add extra test conditions in the item of output current limit.

         Because in datasheet, the test conditions is only showing Vout=0.9xVout(nom).

         Thank you.

    Best regards, Cage.

  • In reply to Cage Chen:

    Hey Cage,

    Vin=3.3 V and Vout = 3 V satisfies (1) Minimum VIN = VOUT + VDO or 1.7 V.

    The reason the customer is seeing it as higher is actually due to the test condition at the top of the table which says VIN = VOUT(nom) + 0.5 V.

    This is at the top of the table 6.5 on page 6 of the datasheet.

    Thanks,
    Daniel

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.