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LM5066I: IIN_OC_WARNING_LIMIT accuracy and delay time

user4979989
Intellectual 2800 points
Part Number: LM5066I

Hi team,

Customer is asking the input OC warning maximum accuracy and maximum delay time:

1. What's the maximum total accuracy of input OC warning? What I know is external shunt(1%) and IIN reporting accuracy(1.75%, CL=VDD, 22mV across in shunt), but there is a comparator which the spec is not listed in datasheet, and should I calculate the total accuracy by root-sum square?

2. What's the delay time from OC warning is triggered to SMBA pin is pulled low? What I know is it should relate to ADC conversion time 100us(typ), is there other parameter affecting it?

What's the maximum conversion time of ADC? 

Thanks.

  • 0
    TI__Guru** 105361 points
    Hi User,

    Let me check and get back to you on these details.

    Best Regards,
    Rakesh
  • 0 in reply to Rakesh
    TI__Intellectual 2800 points

    Hi Rakesh,

    Thank you, looking forward your reply.

  • 0 in reply to user4979989
    TI__Intellectual 2800 points
    Hi Rakesh,

    In datasheet, there is a MUX connect to ADC to convert the data like current/temperature/voltage information, and the ADC sampling rate is 1kHz, there is a spec about ADC is "Acquisition round robin time" which is 1ms.
    Does it mean worse case delay time of OC warning response is at least 1ms since the data is converted one by one?
    Is there anything also affect the response time? (From OC warning is triggered to SMBA pin pulls low)
    Thank you.
  • 0 in reply to Rakesh
    TI__Intellectual 2800 points
    Hi Rakesh,

    Is there any update about my questions?
    Sorry for pushing so hard but my customer is still waiting for our response.
    Thank you.
  • 0 in reply to user4979989
    TI__Guru** 105361 points
    Hi User,

    Sorry for the delay. I will reply by today.

    Best Regards,
    Rakesh
  • 0 in reply to Rakesh
    TI__Guru** 105361 points
    Hi User,

    1. What's the maximum total accuracy of input OC warning? What I know is external shunt(1%) and IIN reporting accuracy(1.75%, CL=VDD, 22mV across in shunt), but there is a comparator which the spec is not listed in datasheet, and should I calculate the total accuracy by root-sum square?
    1A) The effect of current amplifier is included in 1.75%. Since, it is statistical variation, I suggest to use R.M.S root-sum square to calculate total accuracy.

    2. What's the delay time from OC warning is triggered to SMBA pin is pulled low? What I know is it should relate to ADC conversion time 100us(typ), is there other parameter affecting it?
    What's the maximum conversion time of ADC?
    2A) The worst case delay of OC warning trigger to pull SMBA pin LOW is 1ms. There are no other parameter which could affect the delay.

    Best Regards,
    Rakesh