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LM5164-Q1: Behavior with OPEN Pin

Kurumi Hasegawa
Expert 6521 points
Part Number: LM5164-Q1
Other Parts Discussed in Thread: LM5146

Hi team,

What would be expected behavior with the following condition?

Would it operate, or would there be no output?

  • EN/UVLO open
  • RON open
  • FB open

I tried to see the behavior using the simulation but it does not work (error was popped up).

I'd appreciate it if you could give me some possible outcomes.

Best regards,

Kurumi Hasegawa

  • 0
    TI__Expert 4271 points

    Hi Kurumi，

      What's the main purpose of this question？ I think it can't be simulated in Pspice or Simplis， because we don't know the charge distribution on those floating pin in real world. 

      In my opinion, there will be no output since there isn't a EN voltage. When Ven<1.1V, this device will be in shutdown mode with all function disabled. And LM5146 doesn't have a internal current source to pull up Ven. So, when PIN EN is floating, this device will mostly in shutdown mode, the states of PIN RON and PIN FB are meaningless here.

      If it is an important biz case, I can test on demo next week.

    BR,

    Victor

  • 0 in reply to Victor Yu
    TI__Expert 6521 points

    Hi Victor,

    Thank you for your comment. The customer is considering the case when open/short happens, like poor soldering. 

    Also, sorry for the confusion. I meant that when PIN EN/RON/FB open separately. For example when the PIN EN and FB are connected correctly but PIN RON is open. 

    From your comments, I guess when EN is open there might be no output. Could you give us some predictions on PIN RON and FB?

    Best regards,

    Kurumi Hasegawa

  • 0 in reply to Kurumi Hasegawa
    TI__Expert 4271 points

    Hi Kurumi，

      I'm glad to tell you that I found a formal document which can solve this question. Please read Table 4-3 of the attached file. 

    snva918a.pdf

  • 0 in reply to Victor Yu
    TI__Expert 6521 points

    Hi Victor,

    This is more than perfect! Thank you so much for sharing the material. I appreciate it a lot.

    Thank you again,

    Kurumi 

  • 0 in reply to Kurumi Hasegawa
    TI__Expert 4271 points

    Hi Kurumi，

      Happy to know it helps. For Automotive devices, we can find this kind of information on product page.

      Have a good weekend.