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LM48580 power dissipation

Dmitry Ovsyannikov
Prodigy 20 points
Other Parts Discussed in Thread: LM48580

Dear community,

LM48580 maximum power dissipation numbers in datasheet is given for 6uF buzzer capacity.

How can I calculate power dissipation, if I use buzzer with much smaller (8-11nF) capacity? Can I estimate, that it could be few hundreds times lower, than shown on Figure 12 in datasheet?

Also, how could I estimate power consumption at frequencies, higher than 200Hz? Figure 12 shows very high values even for 2kHz, but  I suspect that my system could produce sound with much higher frequencies, up to 10kHz.

Output voltage generated is 25Vpp.

  • 0
    TI__Guru**** 189401 points

    Hi, Dmitry,

    The current is dominated by the current to the load - so the capacitance and frequency will impact your current drawn from the power supply.

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 20 points

    Hi Don,

    Thank you for answer!

    Datasheet figure 12 states power consumption at 2kHz, 10Vpp, 6uF load as 2700mW.

    So for 10kHz, 25Vpp, 10nF I could calculate (very roughly, of course) consumption as:

    2700mW * (10kHz / 2kHz) * (25Vpp / 10Vpp) / (6uF / 10nF) = 2700 * 5 * 2.5 / 600 = 56mW

    Can I estimate from this, that actual power consumption will not exceed ~100mW in this case?