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The Advancing LED Bulb - SMD -COB - MCOB

By: :JIANSONG WU 4 comments
The Advancing LED Bulb - SMD -COB - MCOB
Let’s look at 3 types of LED bulbs and the advantages of COB LED
On the left; SMD 5.6 watt – HBLED 5 watt – MCOB 9 watt
SMD remains one of the breakthrough LED technologies responsible for bringing LEDs from the low output DIP leds, to 100+ lum per watt power houses used in today’s LED Lighting. SMDs use tiny ceramic cups to hold the wafern and phosphor in place, these cups can be mixed and matched into all types of lighting products.
Drawbacks of SMD; Each LED has a slightly different “white” and they must be “Binned” together. then thermal management issues (see diagram)
High brightness LEDs, usually covered with a drop of polymer (to focus and protect), are common in many of today’s LED Bulbs and Lights. Like SMD, they are a small point light source, and produce significant amounts of heat.
COB :Removing thermal management barriers
The Next Generation of LED, is without doubt; Multiple or integrated Chip, Referred to asMCOB (Multiple Chip On Board) or MCCOB (multiple chips and cups on board)
This new LED lighting technology comprises of many small “Gallium Nitrate” based crystals integrated into one large single chip.
COB (Chip on board) LED technology, differs from traditional LED in that instead of individual SMDs soldered to a circuit board and then mounted to a heat sink; the Wafers or “Wafern” are cut into some hundred small chips, with a thickness of only approx. 250 µm. These tiny small and hardly visible pieces of semiconductor crystal are bonded directly to the aluminum substrate (with a proprietary bonding procedure) allowing for optimum heat dissipation, and solderless fabrication.
The yellow discs are simply a phosphor coating, enabling complete control of color temperatures.This type of LED technology makes chip densities up to 70 chips per square centimeter possible, and promises to offer much more flexibility over other LED technologies.
As with all LED products however, the drivers and thermal management are the key to LED product longevity.
MCOB Exhibits superior Thermal management compared to DIP or SMD, LED technologies
These are becoming more common in floodlights and High bay lights. They are cheaper to assemble than multiple single chips and so make products like high bay and floodlights much more affordable than multiple chips.
MCOB is also found in LED bulbs and LED tubes, however compared to SMD surface mounted diode technology, MCOB technology is still in its infancy.
Watch for this exciting new technology in new ultra efficient high output LED lighting.
COB———Chips embedded on board
MCOB——Multi-Chips embedded on board
MCCOB—— multiple chips and cups on board
categories : News

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Aug 18, 2020


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