Application Note - SLPA015

Pritesh Metha

Hi,

In SLPA015 application note , which formula used to calculate 125 deg/w thermal resistance of 1 oz copper. What is the same for 3oz copper?

0 Keith Keller over 3 years ago

Hello,

The thermal impedance is linear and based on thickness of the copper plane.

These calculations can be found in Section 4-1 (Table 5) of SLPA015:
Constructing Your Power Supply - Layout Considerations
https://www.ti.com/lit/ml/slup224/slup224.pdf

For 3 oz copper, I would use 75oC/W estimate.

Best regards, Keith

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