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WEBENCH® Tools/LM61460: what happens if Peak current goes above 6A ?

Seokmin Hong
Intellectual 485 points
Part Number: LM61460
Other Parts Discussed in Thread: LMR33630

Tool/software: WEBENCH® Design Tools

Hello, I am trying to use LM61460 in my system.

My system will use 19V, and  maximum current  6A.

I tried webench Power designer using LM61460, and I have some questions about the results.

(I set Vin 21V - 29V, Vout = 19V, Current 6A)

Below is the result.

I out is 6A, but Ipeak is 6.49A. Is this Okay? 
In the datasheet max current is 6A, so if Ipeak is 6.49A then it will go over the spec.

Can LM61460 handle 6.49A I peak current? If it can, then what is the real(?) max current that LM61460 can handle?

  • 0
    TI__Mastermind 27470 points

    Hi

    it can handle the 6.49A , the peak current means the 6A-dc+0.5A-ac(0.5X inductor ripple), the peak current limit min value is 8.9A, so if you peak current not over 8.9A, the converter will not limit the output, but you may need care about the thermal with high current output

    thanks

  • 0 in reply to Daniel Li14
    Intellectual 485 points

    Thanks for quick and kind reply.

    I understood. Just one more question,

    Because peak current limit min value is not mentioned in the datasheet,

    All the other buck regulator's have similar values of limit current value?

    For example, LMR33630 has 3A output current in the datasheet.

    Then is this also can handle over 3A? Maybe 5A? 6A?

  • 0 in reply to Seokmin Hong
    TI__Mastermind 35210 points

    Hello Seokmin,

    If datasheet absolute maximum electrical ratings are not violated, nor, recommended operating conditions, TI devices will conform to electrical characteristics table found in datasheet without degradation in lifetime.