• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 532 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.

LM66200: Question about switching between VIN1 and VIN2

Kaji@PAN
Mastermind 7805 points
Part Number: LM66200

Tool/software:

Hello,

I am an FAE at a distributor that handles TI products.
I received the following questions from my customer.

Please tell me about the function that automatically switches between VIN1 and VIN2.
(Question 1)
How many mV must the potential difference between VIN1 and VIN2 be?
(Question 2)
How does VOUT change when VIN1 = VNIN2?
Table 7.3.1 of the datasheet does not define the state of VIN1 = VIN2.

The background to the question is that this product will be used in an application that switches batteries, and it is expected that VIN1 and VIN2 will be in close states.
In that case, I would like to know whether VOUT can supply a stable voltage and current.

Best regards,

  • 0
    TI__Mastermind 48475 points

    Hi Kaji,

    When VIN1 and VIN2 are very close, both the paths will conduct, and reverse can also flow. If both inputs are exactly equal, load sharing will be seen.

    Regards,

    Shiven Dhir

  • 0 in reply to Shiven Dhir
    Mastermind 7805 points

    Thank you for your reply.
    The customer has asked you another question about your answer.

    I understand that the answer to question 1 is contained in the answer to question 2.
    However, "very close" information is necessary when designing a product.
    So I'll ask again: do you have any information about question 1 from the other day?
    I understand that there will be variations due to the circuit structure, but I think there is some value in it.
    Or does this mean that there is no value that can be guaranteed?

    Best regards,

  • 0 in reply to Kaji@PAN
    TI__Mastermind 48475 points

    Hi Kaji,

    We have a spec for it. Maximum difference(rising) is 70mV.

    Regards,

    Shiven Dhir

  • 0 in reply to Shiven Dhir
    Mastermind 7805 points

    Thank you for your reply.
    However, I have a question about your answer.
    Aren't the electrical characteristic specs you provided showing the values ​​when VINx is low relative to VOUT?
    What my customer wants to know is the potential difference when VIN1 and VIN2 switch.
    If VIN1 is higher than VIN2, will it not switch to VIN2 unless VIN1 is 70mV lower than VIN2?
    Best regards,

  • +1 in reply to Kaji@PAN
    TI__Mastermind 48475 points

    Hi Pan,

    Switching will happen to whatever the higher voltage is. Although reverse current won't be blocked until VOUT> VINx + 70mV(max)

    Regards,

    Shiven Dhir