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TPS2552-1: Question about peak current when Vout was shorted to GND

Go
Genius 4190 points
Part Number: TPS2552-1

Tool/software:

Hi,

 

I'd like to ask about the Figure.15 "Current Limit Response - μs" on page 10 of TPS2552-1 D/S as follows.

 

1. Regarding at the red circle, does this point mean that TPS2552-1 limit the current around 5A in 1.2 or 1.3us after Vout became short to GND?

(as an average data from multiple devices' test with VIN=5V, RILIM=20kΩ, TA=25℃)

 

2. Regarding at the blue circle, does this point mean that TPS2552-1 limit the current around 2.2A in 10us after Vout became short to GND (as an average data from multiple devices' test)?

(as an average data from multiple devices' test with VIN=5V, RILIM=20kΩ, TA=25℃)

 

3．Regarding the peak current at the red circle(about 5A), Is there any possibilities that the peak current would be the cause of the damage to TPS2552-1?

 

4．Do you have same type of data (means Figure 15) with the following conditions, VIN=5V, RILIM=47kΩ, TA=25℃?

Thanks,

Go

  • 0
    TI__Intellectual 1800 points

    Hi Go,

    1. This point means that when the peak current is 5A, the response time for limiting the overcurrent to Ios is around 1.3 us. Please refer to section 9.3.1 in the datasheet for understanding.

    2. Similar to your question 1, this point means that when the peak current is 2.2A, the response time for limiting the overcurrent to Ios is around 10 us.

    3.The chip is designed to protect the circuit in such overcurrent condition, so I don't think it will be damaged. With higher peak current, the response time is shorter, which limits the heat generated during faults.

    4. Unfortunately I don't have the data under the test condition you mentioned.

    BR,

    Ke Wang

  • 0 in reply to Ke Wang
    Genius 4190 points

    Hi, Ke Wang

    Thank you for your comment.

    Regarding your comment,

    ・"With higher peak current, the response time is shorter", do you have an exact data of response time for higher peak current?

    ・Is there any limitation of max peak current?  I couldn't find any of it in D/S. like, absolute max ratings. 

    and Figure 15 is data with the condition RILIM=20kΩ, do you think the response time will vary with the condition RILIM=47kΩ?    

    Thanks,

    Go

  • 0 in reply to Go
    TI__Intellectual 1800 points

    Hi Go,

    I think the time might be slightly different when you set Rliom as 47kOhm but won't be significant.

    As for the data you requested, I don't have it yet. Let me check with my colleagues and get back to you tomorrow.

    BR,

    Ke Wang

  • 0 in reply to Ke Wang
    Genius 4190 points

    Hi, Ke Wang

    Thank you for your comment.

    I really appreciate it.

    Thanks,

    Go

  • +1 in reply to Go
    TI__Intellectual 1800 points

    Hi Go,

    Here's the feedback from my colleague:

    1. We do not have the exact data of response time at higher peak current. Regarding it as 2 us is suggested for the high current conditions with a safe margin.

    2. The maximum current should be limited by the loop inductance during the short circuit event, with the limited input voltage and response time, the peak current should not be extreme high.

    BR,

    Ke Wang