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Thermal Design for Power Stages

Thermal Design for Power Stages. Thermal Design Consideratons. Understand test conditions Power test Natural convection or forced air flow Heat sink requirements Thermal mass Thermal resistance Thermal interface requirements Thickness Thermal conductivity. Device power density.

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Thermal Design for Power Stages

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  1. Thermal Design for Power Stages

  2. Thermal Design Consideratons • Understand test conditions • Power test • Natural convection or forced air flow • Heat sink requirements • Thermal mass • Thermal resistance • Thermal interface requirements • Thickness • Thermal conductivity

  3. Device power density • 2x300W output power @ η=90% → 60W dissipation • Power pad area = 0.64mm2 (<0.1sq inch) • Thermal interface material between device and heat sink is very important! • Thin interface layer required • High thermal conductivity required

  4. Heatsink mounting

  5. Heatsink mounting

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