MCPCB Design&Thermal Analysis

 

One of the biggest challenges faced by solid-state lighting designers is reliability. Electrical and thermal conditions are two major factors affecting device life and lighting output and, while long life is a key benefit of LEDs compared to incandescent and fluorescent light sources, all bets are off if the LEDs exceed their temperature ratings
 
>>To consider Thermal Conditions, SUNNY PCB use some software to do thermal simulation, so we select the best matched IMS(insulated metal substrate) for  thermal performance and cost consideration, at the finished led board stage, we could use burn in to ensure thermal performance is ok.
 
>>To design an MCPCB board is similar to a traditional FR4 board in terms of imaging and wet processing operations. But we have to consider a secondary mechanical operations to make the design manufacturability and cost-effective.
 
 
 
Manufacturing a Cost-Effective Board,To use standard thickness control cost well.1.0mm/1.6mm are the most common,(Here we talk about Aluminum pcb, for Copper pcb/Iron pcb, please talk with us in mail)
a.1050 Aluminum is used for bendable MCPCB
b.5052 Aluminum is the most cost effective base material for flat MCPCB
c.6061-T6 is available but more expensive
 
Flatness
Flatness is affected by the amount of copper required. Therfore CTE rules must be involved to consider. This will allow the heavier the copper construction with the required thicker aluminum or copper base to prevent bowing. Additional dielectric thickness will be required for drilling ,scoring,routing and punching.
 
Dielectric
The standard dielectrics are 1.0W/m.k,  1.5W/m.k,  2.0W/m.k,  3.0W/m.k, The higher thermal performance , the more expensive .Standard Tg is 140 degrees, Besides, 170 degrees at a slightly higher cost is available.
 
Copper Circuit Foil
The thinner the circuits foil chosen the lower the cost. Hoz/1oz/2oz are the most common copper foil. Thpically there will be an increase in the current capability of MCPCB comparing with the standard FR4 boards,
 
Solder Mask
Super Bright White is the most commonly used with a reflectivity of approximately 89% and others colors such as green, black, red and blue are available too.
 
Component Mark
Nomenclature Typically on white solder mask is black,.