Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

  • State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 64 subscribers
  • Views 104 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

TPS548D22: TPS548D22 - Maximum Output Current

Kojima, Takao
Intellectual 1065 points
Part Number: TPS548D22

Hi Team,

Our customer is using TPS548D22 and he is asking what is maximum output current of this device since datasheet shows OCP vallley current can be set at >70A with 240kohm in Figure 15. Can you clarify what is maximum current and why datasheet shows the valley current upto >70A in the diagram? In addition what does mean that Iclamp_hi  is 75A(TYP) in table of P7 of the datasheet?

Best regards,

Kojima

  • 0
    TI__Guru 52635 points

     

    Kojima, Takao said:
    Our customer is using TPS548D22 and he is asking what is maximum output current of this device since datasheet shows OCP vallley current can be set at >70A with 240kohm in Figure 15

    The TPS548D22 is designed to support continuous operational application loading currents upto 40A.  It is not recommended for continuous operation above 40A.

    The TPS548D22 can safely operate at momentary loading currents above 40A during a fault condition, but should not be designed to operate above 40A for extended periods.

    Kojima, Takao said:
    why datasheet shows the valley current upto >70A in the diagram?

    In order to ensure current limit does not trigger during normal operation, the over-current limits must be set above the maximum expected application current, so users need to be able to program the current limit to levels above the devices' rated continuous application current.

    Kojima, Takao said:
    In addition what does mean that Iclamp_hi  is 75A(TYP) in table of P7 of the datasheet?

    This is a fixed, internal peak-current limit imposed on the high-side FET which will trigger a turn-off of the high-side FET if the current is detected above 75A.  This is intended to provide limited inductor saturation protection against excessive peak switch current.

  • 0 in reply to Peter James Miller
    TI__Intellectual 1065 points

    Hi Peter,

    Thank you for your clarifications. What is maximum period of time for momentary load current over 40A so that this device safely operates?

    Best regards,

    Kojima  

  • +1 in reply to Kojima, Takao
    TI__Guru 52635 points
    Kojima, Takao said:
    What is maximum period of time for momentary load current over 40A so that this device safely operates?

    That would depend on the thermal environment and resulting self-heating, but as long as the die temperature remains below the 150C maximum die temperature, the device can handle occasional loading currents over 40A for a few seconds, but the RMS averaged current should not exceed 40A when averages over a 60-second period to avoid potentially reduction in over-all product life.