Introduction
LED drivers generate heat when operating. To dissipate this heat correctly, a robust thermal connection with aluminum heatsinks is essential. Incorrect installation shortens driver lifespan, reduces efficiency, and creates a fire hazard.
1. Thermal Interface Material (TIM)
- Thermal paste or thermal pads must be used between the aluminum surface and the driver casing.
- If thermal paste is preferred, it should be applied thinly and homogeneously, with no air bubbles.
- A material with a thermal conductivity value of at least 1.5 W/m·K should be chosen.
2. Surface Flatness and Cleanliness
- The aluminum heatsink surface should be smooth and flat (Ra ≤ 1.6 µm is ideal).
- Before installation, the surface should be cleaned with isopropyl alcohol; oil, dust, and oxide layers increase thermal resistance.
3. Screw Torque Value and Pressure Force
- Screws should be tightened with the cross-tightening method to an equal torque.
- Excessive torque deforms the aluminum; insufficient torque leaves air gaps.
- For M3 screws, a torque of generally 0.4–0.5 Nm is sufficient.
4. Electrical Insulation
- If electrical insulation is required between the driver casing and the heatsink (especially for drivers with metal casings), an insulated thermal pad should be used.
- Without insulation, there is a risk of short circuit.
5. Heatsink Sizing
- The heatsink should be selected according to the driver's maximum power dissipation (Pd) value.
- For natural convection in enclosed environments, the heatsink thermal resistance should be ≤ 5°C/W.
- Ambient temperature + driver temperature rise must not exceed the maximum junction temperature.
6. Cable and Connection Management
- Power cables should not contact the heatsink; heat-resistant cable conduits should be used.
- Connection points should be protected with silicone gaskets against moisture and vibration.
📹 Recommended Video
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