Commercial
Chip-on-board know-how (COB) is a technique for the direct meeting of unpackaged semiconductor chips on printed circuit boards to an digital meeting. The time period COB is used for all assemblies that comprise the bare semiconductor, whereas initially it was understood solely as assemblies with chip-and-wire know-how. By eliminating particular person packaging of semiconductors, the ultimate product could be extra compact, lighter and cheaper to provide. In COB know-how is often seen the place we discover chips below black resin droplets on PCB. It is not uncommon for LCD modules like behind 1602A LCD module.
This method is used for LED encapsulation by becoming a member of many LEDs in a semi-rigid resin. One of these LED bundle permits for attaining opening angles of as much as 120°. As well as, being a single bundle, the warmth dissipation of the LED is far higher, which improves its mild depth and sturdiness. One of these encapsulation was initially utilized in spotlights since with a single LED loads of illumination is achieved with out the necessity for a lot energy. Due to the evolution of LED merchandise you will discover bulbs that current the sort of LED.
DIP LEDs are the LEDs we generally use in DIY electronics and in addition they’re used as indicator lamps. SMD LEDs are generally utilized in numerous merchandise which work as a supply of sunshine. COB LEDs provide sure benefits over typical LED applied sciences equivalent to SMD LEDs or DIP LEDs.
It’s apparent that COB know-how is permitting us a better packing density of the LED array, that is what’s known as environment friendly lumen density. Think about a sq. space of 10mm x 10mm array. You may pack solely 9 LEDs inside that 10mm x 10mm array. Within the case of SMD, you’ll be able to pack 40 LEDs within the 10mm x 10mm array. Within the case of COB, we are able to pack 342 LEDs in the identical 10mm x 10mm array. The whole chip would require only one circuit and two contacts. The much less quantity and space of welding factors end in a low charge of failure.
The ensuing mild can be of upper depth and extra uniformity. So this know-how can scale back the footprint and vitality consumption of the LED array.
Nonetheless, there are disadvantages to COB LEDs. The primary is the prohibitive value. Secondly, the number of colors is restricted to chill white, impartial white, heat white, blue, inexperienced, purple and pink. COB LEDs are inclined to run hotter and the diodes are pushed approach tougher out of the warmth. Additionally, not all the time we want concentrated focussed mild.
So, the utilization of COB LEDs are primarily for producing ornamental lights, flashlights, floodlights and many others.
