• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 64 subscribers
  • Views 655 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

TPS24750EVM-546: TPS24750EVM Rsense dimensioning and latch-off function

Josko M
Intellectual 950 points
Part Number: TPS24750EVM-546
Other Parts Discussed in Thread: TPS24750

Hi People,

I have two questions:

1. TPS24750 (Latch-off): " Data sheet,  9.3.3 FLTb: "The fault is reset when EN is pulled low or VCC falls under UVLO."
 Does it mean that Latch-off version can be also restarted/reset by simple disconnection of input power supply?

2. Rsense dimensioning: "Data sheet, 10.2.2.1.1 STEP 1. Choose RSENSE, RSET, and RIMON: " To achieve high efficiency, the power dissipation in RSENSE must be kept to a minimum. A RSENSE of 2 mΩ develops a voltage of 22 mV at the specified peak current limit of 11 A, while dissipating only 200 mW at the rated 10-A current. This represents a 0.17% power loss. "
Is there any special reason for 1W Rsens (R1) in EVM?  (It is 5x safety margin) Regarding power the 0.5W current sense resistor should be quite enough.

BR,

Josko

  • 0
    TI__Mastermind 42795 points
    Josko,
    Moving this to the load switch forum.
  • 0
    TI__Guru** 105361 points
    Hi Josko,

    Please see my response below.
    [1A] Yes, latch-off version can be also reset by input power cycling i.e., simple disconnection of input power supply.

    [2A] Lower power rating 0.5W typ would be enough. Since TPS24750 is a circuit breaker with overload timeout device, providing higher power rating sense resistor facilitate the users to test with various overload levels & timeouts. Of-course this also needs small rework for components like CT etc.

    Best Regards,
    Rakesh