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TAS5722L: Maximum Output Power

Jerome Villapando
Intellectual 290 points
Part Number: TAS5722L

Hello,

I was looking through the datasheet and Figure 5 caught my eye. For a supply voltage of 5V and a load of 4 Ohms, the maximum power is stated to be about 3W. How is this curve derived because assuming 100% efficiency, Power = 5V^2 / 4 ohms = 6.25W. Does this take inefficiency into account? And if so, does it use worst-case inefficiency? Also how do you properly use this graph?

Jerome

  • +1
    TI__Mastermind 37990 points

    Hi Jerome

        As TAS5722L is an audio amp, we calculate the power before any clipping happens, so the output waveform needs to be sine wave. Supply voltage 5V will be the peak value of a sine wave, if you calculate power, you'll find your results need to be divided by 2. And the real output peak voltage on the load will a little smaller than 5V, not because efficiency, but for the voltage drop on the MOSFET Rdson and the inductor.