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LM384: About Max Power Dissipation of LM384

Part Number: LM384

Hi.

I confirmed the Max Power Dissipation is 1.67W in the data sheet.

But Looking at Fig.10, the Device Dissipation  is larger than 1.67W.

Are Max Power Dissipation and Device Dissipation(Fig.10) different parameters?

 

The LM384 is used in my system as follows.

 ・Supply Voltage is 24V

 ・Connect a speaker(8Ω Load, Rated 1W) to the output of LM384

Please tell me about the following

 ・What is Power Dissipation  when the (8Ω Load, Rated 1W) Connected?

・What is the recommended thermal resistance of the Heat sink?

 ・What is the thermal resistance of the Staver “V7” Heat Sink?