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TLV9041: low power design/strategy?

AnBer
Mastermind 28900 points
Part Number: TLV9041

Team,

Do we have some app note that gives some strategy for OPA used for low power application.

So far no OPA has been selected but the use case the OPA needs to operate for 0,5ms every 125ms. It should be in low power the rest of the time.
What would be best strategy to operate?
    power up/down every 125ms?
   Or rather choose a low power OPA and leave always ON?
   Or have some front end before the OPA to switch the OPA input between High impedance and signal every 125ms for 0,5ms?

Thanks in advance,

A.

  • 0
    Guru 140200 points

    Hi Anber,

    this so much depends on the application and the circuit that no simple answer can be given.

    Please give way more details.

    I tend to use a low power design with the OPAmps permanently turned-on. Switched circuits often suffer from charging and discharging issues. Think only about the decoupling caps (or AC coupling caps !) which have to be charged eight times per second.

    Kai

  • 0 in reply to kai klaas69
    TI__Expert 8136 points

    Hey Anber,

    Kai makes a great point regarding charging and discharging caps. This can sometimes make the power savings from shutdown mode ineffective in reducing total system power. 

    The best method to understand power implications is to simulate or bench the intended circuit. 

    In terms of low-power content, Daniel Miller and Carolina Walter wrote a great blog series on designing with low power amplifiers:

    Low Power Blog

    Part three of the series covers power savings associated with shutdown capable amplifiers. 

    125ms seems reasonable for switching. TLV904xS might be a good option depending on the configuration of the amplifier. 

    Of course, the amplifier will have a time delay from start of the device enable signal to a stable linear amplifier output. This time delay can all be influenced by what is connected to the amplifier.

     Please let me know if you have any questions.

    Best,

    Jacob