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AMC3330-Q1: Formula for high voltage divider circuit

Danilo A.
Mastermind 24715 points
Part Number: AMC3330-Q1

Hi Team,

Our customer is using AMC3330QDWERQ1 in their design and wants to know the formula for high voltage divider circuit. The input voltage is 300V. Section 8.2.2 provides some formula but it seems that there is none that includes the parameters such as input voltage, R11 and R12 and other important parameters. Can you please share the formula for computing the voltage divider with reference to the input voltage. Additionally, what does VLx in Section 8.2.2 stands for? I understand that we have a calculator from the product page.

Regards,

Danilo

  • 0
    TI__Guru**** 168605 points

    Hi Danilo,

    Use the values in Table 8-2 and the two simple equations in Section 8.2.2.  VLx is the 'Peak Voltage' found in the table.  Icross is arbitrary, but use those numbers and plug them into the two equations to get the answers you seek.

  • 0 in reply to Tom Hendrick
    TI__Mastermind 24715 points

    Hi Tom,

    Thank you for the clarification. I shared your response to our customer as well as the calculator from the product page and here is his feedback.

    The links you have shared are Observed, But we need Formula to calculate the input voltage based on input Resistance Divider Circuit(R1, Rsns, R2. where R1=R2) for this AMC3330QDWERQ1 (AMC3330-1)Part Number.

    Regards,

    Danilo

  • +1 in reply to Danilo A.
    TI__Guru**** 168605 points

    Hi Danilo,

    You will have to explain Ohm's Law to your customer, I cannot do that for you.    RTOTAL = VLx / ICROSS = 170 V/100 uA  = 1.7 Meg ohm.  RSNS = VFSR / ICROSS = 1 V / 100 uA = 10K ohm.  1.7 Meg - 10 K = 1.69 Meg / 2 = 845 K.