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28L Immersion Gold High TG FR4 PCB

28L Immersion Gold High TG FR4 PCB

28L immersion gold high tg FR4 PCB 1.company information UNIWELL circuits mainly produces various FR4 PCB, single / double / multilayer sides printed circuit board of FR4 / aluminum / Copper / ceramic base materals. Can meet the special requirements of the cup shape hole, cone shape hole, mirror...

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1.Product describe


Layer: 28  
Board Thickness: 1.6 mm
Surface treatment:immersion gold.
Material: FR4 TG170.
Min line width/line distance:3/3mil
Min hole:0.25mm

Now Uniwell has formed the market development, the product research, the development, the production,the quality guarantee complete system, we focus on quality, cost, service, and experienced continuous growth and succeeded in passing the certification of international quality systems as ISO 9001, UL and ISO14001 environmental quality system.

2.Company information
Uniwell circuits mainly produces various FR4 PCB, single / double / multilayer sides printed circuit board of FR4 / aluminum / Copper / ceramic base materials. Can meet the special requirements of the cup shape hole, cone shape hole, mirror surface aluminum base, and the 10oz thicker copper circuit board etc. you know more about Uniwell , For manufacturing capability, we can make 1-40 layers at a very competitive price. Wish good quality, on time delivery and perfect service should be the reason you choose us as a pcb design & pcb supplier in China!

3.Production capability
Uniwell circuits co., lTD. has invested in the best equipment, envirnoment and staff training. We have a production capability for standard and HDI ,Rigid,RF and high frequenly PCBs.  


FR4,CEM-3,Metal Core,

Halogen Free, Rogers, PTFE

Max. Finishing Board Size

1500X610 mm

Min. Board Thickness

0.20 mm

Max. Board Thickness

8.0 mm

Buried / Blind Via (Non-cross)


Aspect ration


Min. Drilling Size(Mechanical)

0.20 mm

Tolerance PTH/ Pressing fit hole /NPTH

+/-0.0762 mm / +/-0.05mm / +/-0.05mm

Max. Layer Count


Max. copper (inner/outer)

6OZ/10 OZ

Drill tolerance


Layer to layer registration


Min. line width/space


BGA pitch


Surface treatment

HASL, Lead free HASL,

ENIG, Immersion silver/Tin, OSP

4.The application of PCB board in LED drive chip.
The driver of the LED needs to provide constant current power supply to ensure the safety of high-power LED and achieve the ideal luminous intensity.In the field of LED lighting, to reflect the characteristics of energy saving and long life, it is important to choose a good LED driving IC, and there is no good driving IC matching, and the advantages of LED lighting cannot be reflected.Requirements of LED lamps for low-voltage drive chips: 

First, drive chip packaging should be conducive to drive the rapid cooling tube core chip, such as the tube core directly binding on copper plate, and a Pin directly to the outside of the packaging, easy to welding on the PCB board of the copper foil directly fast heat conduction. 

Second, the nominal input voltage range of the drive chip should meet the needs of dc8-40v to cover the application surface, and the pressure resistance is better than 45V.AC 12 V or 24 V input simple bridge rectifier output voltage can follow the grid voltage fluctuation, especially when high voltage output dc voltage will be on the high side, drive IC, such as can not adapt to wide voltage range, often in the grid voltage rise will be breakdown, led light source, and so destroyed. 

Third, drive of the chip itself EMI resistance, noise, high pressure resistance ability is related to the led lighting products can pass the CE, UL certification, so the driver chip itself in the design right from the beginning to choose excellent topology structure and high pressure in production process. 

Fourth, the output current of the drive chip must be constant for a long time. The LED light source can be stable and luminous, and the brightness will not blink.The same driver chip used in the same condition, the output current size to be as consistent as possible, which is discrete, so in mass production automation production line to be effective and orderly;Has certain discreteness for the output current driver chip will choose step before leaving the factory or production line, adjust current setting resistance (Rs) PCB resistance size, make the production of LED lamps and lanterns of constant current drive threatening the same luminous brightness of the LED light source is consistent, maintain the consistency of the final product. 

Fifth, the power consumption of the drive chip is less than 0.5W, and the operating frequency of the switch is greater than 120Hz, so as to avoid the visual flicker caused by the frequency interference.LED green lighting drives the drive chip to the innovative design development, LED lighting is inseparable from the driver chip, therefore requires a variety of functional LED light source drive IC. 

Sixth, driving chip of the nominal output current demand is greater than 1.2 to 1.2 A, as the lighting of led light source, 1 w power led light source, the nominal working current is 350 ma, 3 w power led light source, its nominal working current is 700 ma, the needs of the large power larger electric current.

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