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LMV712-N-Q1: shutdown voltage

Takao Yamamoto
Genius 4135 points

Dear all,

Could you teach me about VSD of 'on mode' and 'shutdown mode' at page 10?

I would like to know how to read this characteristic.

Why is '4.5V' minimum at on mode in spite of '3.5V' being typical value?

And why is '0.8V' maximum at shutdown mode inspite of '1.5V' being typical value?

Best regards,

  • 0
    TI__Mastermind 23810 points
    Yamamoto-san,

    I am going to move this post to the general purpose amplifiers forum. They should be able to help you with this part there.
  • 0
    TI__Guru 52346 points
    Hello Takao,

    The input is a logic pin. Logic pins have thresholds. Think of the logic signal slowly ramping up and ramping down, and when the amplifier should turn on.

    Ideally, the "on-mode" will be at 5.00V, and "shutdown" will be at 0.00V. The thresholds are set to allow for level variations.

    The 4.5V "minimum" means that we specify that the device *will* be ON and fully functional when the shutdown pin >= 4.5V. Typically, the device will turn on sooner at around 3.5V, but that is not guaranteed. Since the range is 4.5 to 5V, it is a minimum.

    Similarly, on the negative side, we specify that the device *will* be OFF at a maximum of 0.8V. It typically starts turning off when SD goes below 1.5V, but it *will* be off at 0.8V or less. Since the range is 0V to 0.8V, it is a maximum.

    So we are specifying that the device *will* be on when the SD pin is between 4.5V and 5V, and *will* be OFF when SD is between 0 and 0.8V. These are the limits that should be used for designs.

    Regards,