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Power Consumption of SN65LBC179QDR

Jayden Park
Expert 1100 points
Other Parts Discussed in Thread: SN65LBC179

Hi!

Our customer will use SN65LBC179QDR device.

But Our customer have question of power consumption.

If see datasheet, it mentioned Icc=5mA.(No Load)

If use VCC=5V, Power consumption is 25mW(5V*5mA)

If see datasheet, it mentioned as below.

Please explain to total power consumption and above table.

 

 

  • 0
    TI__Expert 5400 points

    Hi Jayden,

    The Dissipation Rating Table shows the maximum allowable power dissipation for the D and P packages without causing thermal damage to the package or part.  The Derating Factor allows you to calculate the maximum dissipation rating for any ambient temperature.

    For the SN65LBC179, total power dissipation consists of two parts:

    • Quiescent power, which is the quiescent current times the operating voltage with no load
    • Output power, which is the power dissipated by the driver when driving a load

    For a complete description of how to calculate total power dissipation in your application, I recommend the application note Calculating Power Dissipation for Differential Line Drivers.