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TPS63805: TPS63805 about Power dissipation and ThetaJc

Part Number: TPS63805

Hi, Support Team

We simulation WEBENCH TPS63805, the IC pd is 2.398W

TPS63805.pdf

but If we reference datasheet:  PD=(TJ(max)-TA)/Theta JA=(150-25)/78.8 ; Pd=1.58W

wich Pd is correct?

if any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence

  • Hi  Lawrence,

    The PD and Theta JA in Webench are calculated value. And the Theta JA in DS is a typical value with stardard layout which means the actual Theta JA can be decreased with a bigger size layout.

    Also the PD in DS is the maximum acceptable one with stardard layout.

    Regards

    Tao