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UCC28070A: power consumption on IC

Koji Ikeda
Expert 6515 points
Part Number: UCC28070A
Other Parts Discussed in Thread: UCC28070

Hello Support team,

Customer would like to calculate power consumption on UCC28070A, could you provide how to calculate or application note?

And they found that supply current I_VCC has tree test setup, disabled, enabled, UVLO. Does this means,

UVLO: under UVLO,

disabled: UVLO break but not switching 

enabled: UVLO break and switching

Is their understanding correct?

Thanks,

Koji Ikeda

  • 0
    TI__Mastermind 24375 points

    Hi Ikeda-San,

    Thank you for the query on UCC28070.

    We do not have an app note showing this, but the IC can take current from 15-20mA for applied bias voltage.

    You are correct, the I_VCC varies depending on the operation and has different values in UVLO state, Enabled state (Out of UVLO and switching - normal operation) and disabled (out of UVLO but not switching - protection mode).

    Regards,

    Harish

  • 0 in reply to Harish Ramakrishnan5
    TI__Expert 6515 points

    Harish-san,

    Thank you for your support.

    >We do not have an app note showing this, but the IC can take current from 15-20mA for applied bias voltage.

    I_VCC spec on datasheet is max 12mA, do you think any other power consumption? 

    Is the power consumption VCC X I_VCC only? In this customer case, they plan to use external gate driver, I think that they don't need to care power consumption of gate driver on UCC28070. 

    Thanks,

    Koji Ikeda

  • +1 in reply to Koji Ikeda
    TI__Mastermind 24375 points

    Hi Ikeda-San,

    The gate drive loss will be limited to Vg*Qg*fsw (approx.) and as you told it will be on the external driver (buffer) and should not be a concern from the IC perspective.

    Thank you

    Regards,

    Harish