Aluminum Based PCB For Led
ALPCB043
An aluminum PCB is a metal-based board and its structure is divided into three layers: Aluminum printed circuit boards are also known as metal base PCBs, and are comprised of metal-based laminates covered by copper foil circuit layers. Xing Da is a leading aluminum led PCB manufacturer.
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HOW ARE ALUMINUM PCBS MADE?
A thin layer of thermally conductive but electrically insulating dielectric is laminated between a metal base and a copper foil. The copper foil is etched into the desired circuit pattern and the metal base draws heat away from this circuit through the thin dielectric.BENEFITS OF ALUMINUM PCBS
- Heat dissipation is dramatically superior to standard FR-4 constructions.
- The dielectrics used are typically 5 to 10 times as thermally conductive as conventional epoxy-glass and a tenth of the thickness
- Thermal transfer exponentially more efficient than a conventional rigid PCB.
- Lower copper weights than suggested by the IPC heat-rise charts can be used.
APPLICATIONS OF ALUMINUM PCBS
Although Power Converters and LEDs are the largest users of these products, Automotive and RF companies are also looking to take advantage of the benefits of these constructions. While a single layer construction is the simplest, other configuration options are available at Xing Da, including:HYBRID ALUMINUM PCBS
In a ‘Hybrid’ IMS construction a “Sub-assembly” of a non-thermal material is processed independently and then bonded to the aluminum base with thermal materials. The most common construction is a 2-Layer or 4-Layer Sub-assembly made from conventional FR-4. Bonding this layer to an aluminum base with thermal dielectrics can help dissipate heat, improve rigidity and act as a shield. Other benefits include:- Less costly than a construction of all thermally conductive materials
- Provides superior thermal performance over a standard FR-4 product
- Can eliminate costly heat sinks and associated assembly steps
- Can be used in RF applications where a surface layer of PTFE is desired for its’ loss characteristics.
- Use of component windows in the aluminum to accommodate through-hole components. This allows connectors and cables to pass connections through the substrate while the solder fillet creates a seal without the need for special gaskets or other costly adapters.
MULTILAYER ALUMINUM PCBS
Common in the high performance power supply market, multilayer IMS PCBs are made from multiple layers of thermally conductive dielectrics. These constructions have one or more layers of circuitry buried in the dielectric with blind vias acting as either thermal vias or signal vias. While more expensive and less efficient at transferring heat as a single layer designs, they provide a simple and effective solution for heat dissipation in more complex designs.
