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ISOW7843:

Stefan Harrer
Prodigy 10 points
Part Number: ISOW7843

Tool/software:

Hi, 

in the chapter features lists a maximum withstand impulse voltage of 10kVpk. In chapter 7.6 a Viosm of 6250Vpk is specified and a voltage of 10kVpk is qualified.

Which value should be considered for the design of the circuit and what is the difference?
Thank you very much.

  • +1
    TI__Guru 54765 points

    Hi Stefan,

    Thank you for reaching out.

    Please note that 10kVpk is the surge capability of ISOW7843, i.e., the device can pass 10kVpk surge applied across its isolation barrier. VIOSM is a parameter defined by IEC 60747-17 (same as VDE 0884-17) where the value of VIOSM requires 60% margin for reinforced isolator. i.e., to rate a device at VIOSM of 6.25kV, the device should be capable of passing 10kV.

    Therefore, I would summarize this as below.

    VIOSM = 6.25kVpk
    Surge Capability = 10kVpk

    The requirement for VIOSM has been recently updated by IEC 60747-17. VIOSM now requires to be greater than or equal to 1.3 times VIMP, please refer to the below FAQ for more information on isolation parameters. Thanks.

    https://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1232289/faq-h-high-voltage-isolation-parameters


    Regards,
    Koteshwar Rao