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LMZM33606: Maximum power output

Lucien Thiriet
Prodigy 40 points
Part Number: LMZM33606


Dear TI engineers,

I am considering using the LMZM33606 power converter to provide 12V from a 24V source.

This converter is supposed to provide up to 6A, which would equal 72W at 12V but on datasheet's main page, is written "Up to 50-W Output Power at 85°C, No Airflow"

1) Is it a continuous output power based on efficiency, temperature and power dissipation?

2) Is the converter able to provide up to 72W for a few seconds once in a while, if the mean power is < 30W?

3) Is the converter able to provide more than 50W continuously provided the cooling is sufficient?

Thanks in advance for your help!

Regards

  • 0
    TI__Guru 50120 points

    Hi Lucien,

    1. Yes that is the case. In addition to that, at 12V output and max current there will be a larger power dissipation that the IC and inductor experience. This would effectively raise the junction temperature of the IC. Please look at the SOA curve for 12V output in Figure 20. In this case if you wanted 12V output and 6A loading (72W power) the maximum ambient temperature you could operate in at no airflow is roughly 50 degC which is calculated based on the maximum junction temperature of 125C.

    2. If you operate at a lower ambient temperature the device can operate at 72W continuous as shown in the linked figure 20 above. 

    3. Same answer as in point 2. 

    Regards,

    Jimmy