ISO7741-Q1: Isolation voltage 800V

Part Number: ISO7741-Q1
Other Parts Discussed in Thread: ISO7741,

Hi

The voltage difference between VCC1 and bus voltage is 800V,

VCC2 and bus voltage is the same reference ground,

Can ISO7741 be supported?

Thanks!

  • Hi Neal,

    Thanks for reaching out.
    From what I understand, VCC2/GND2 share the same reference GND as the bus reference GND while VCC1/GND1 is on a different reference GND and the voltage difference between the two GNDs can be 800V continuously for the product's lifetime. Yes, this isolation voltage is supported by ISO7741-Q1 in DW package.

    The voltage difference between any pin on Side1 (VCC1 side) and any pin on Side2 (VCC2 side) can be upto 1500Vrms or 2121VDC continuously for device's lifetime for ISO7741-Q1 in DW package. This spec is defined in Section 7.6 (Insulation Specifications) of ISO7741-Q1 datasheet. Thanks.


    Regards,
    Koteshwar Rao

  • Hi

    Can SSOP (DBQ) SIZE support 800V isolation?Thanks!

  • Hi

    What is the difference between the two voltage standards?What standard do I mainly refer to when choosing IC,as below,thanks!

  • Hi Neal,

    SSOP (DBQ) only has a creepage of 3.7mm which is not sufficient to support 800V of isolation working voltage. The device ISO7741 is capable but the SSOP package is smaller size and is meant for application where working voltage is <566 VDC. Hence, DW package with 8mm creepage should be a suitable device for customer application.

    VIOWM and VIORM refer to the same levels while VIOWM is expressed in RMS and VIORM is in peak. This is similar to RMS and Peak voltages of a typical sinusoidal AC signal. If a system has fixed DC voltage and there is no switching involved like in BMS applications, VIORM should be referred. If a system has fixed DC bus but the voltage across the isolator is switching like in motor drives and solar inverters, then VIOWM should be referred. Thanks.


    Regards,
    Koteshwar Rao