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STPA008 Scheda tecnica(PDF) 21 Page - STMicroelectronics

Il numero della parte STPA008
Spiegazioni elettronici  4 x 50 W MOSFET quad bridge power amplifier
PDF  29 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPA008 Scheda tecnica(HTML) 21 Page - STMicroelectronics

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STPA008
General information
28
4.5
Heat sink definition
Assuming a power dissipation of 26 W (e.g. in the worst case situation of frequent clipping
occurrence), considering Tj max is 150°C and assuming ambient temperature is 70 °C, the
available temperature gap for a correct dissipation is 80 °C.
This means the thermal resistance of the system RTh has to be 80 °C/26 W = 3 °C/W.
The junction to case thermal resistance is 1 °C/W. So the heat sink thermal resistance
should be approximately 2 °C/W. This would avoid any thermal shutdown occurrence even
after long-term and full-volume operation.



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