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ADAU1452 pass transistor power dessipation

Question asked by AJAB on Oct 31, 2013
Latest reply on Oct 31, 2013 by AJAB

Hi Support Team,

 

I am assuming the DVDD current for ADAU1452 is to be maximum 40mA. Now when I need to calculate the power dissipation in the external pass transistor, I simply do (3.3 - 1.2) * 40mA. Now this comes to be around 84 mW. But if we see the recommended transistor as per datasheet, it is a high wattage transistor. Why is this? Is the current assumption wrong?

 

Thank you.

 

Regards,

Archana.

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