We provide totally solution for LED lighting SMT PCB assembly. Worldwide Installation and on site support. Factory (machine and lighting assembly) training.

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LED Lighting Overview: Major Players

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LED Lighting Overview: Market Considerations
 Major Markets
 Entertainment / Theatrical
 Architectural Lighting
 Retail / Office Lighting
 Signage
 Street Lighting
 Applications
 RGB
– Early growth in entertainment space
– Quick adoption into architectural lighting
 White
– Vast adoption following the growth in LED technology
– Energy efficiency initiatives speeding up market penetration

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LED Design Challenges: Binning
 LED Manufacturing companies sort their product by “Bins”
based on lumen output, chromaticity, and wavelength
 Leads to complications in the board-level manufacturing
process
 Many ways to compensate:
 SMT Line part placement
 Calibration in software
 Closed loop feedback

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LED Design Challenges: Binning
 LED Manufacturing companies sort their product by “Bins”
based on lumen output, chromaticity, and wavelength
 Leads to complications in the board-level manufacturing
process
 Many ways to compensate:
 SMT Line part placement
 Calibration in software
 Closed loop feedback

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LED Binning (Cont’d)

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LED Binning (Cont’d)

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Binning Compensation
 SMT line placement:
 Treat different bins of LEDs as different components and place
accordingly
 Calibration Techniques:
 Current Control
– Use 1 bin per board
– Constant current control
 Power Control
– Forward voltage implications over time and temperature
– Adjust current real time to compensate for variation in
forward voltage

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Binning Compensation (Cont’d)
 Feedback techniques:
 Light sensor:
– Sense light output and adjust power accordingly
– Lifetime adjustment:
– Use light sensor to detect reduced light output due to
degradation of efficiency over long periods of time
– Adjust power to achieve previous light output, extending
the lifetime of the product
 Lifetime considerations:
 Thermal Management
 Current and temperature relationship used to estimate lifetime
 Measured by “L70” for white and “L50” for RGB

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PCB Design Considerations
 LED lighting fixtures are usually serial in nature
 Power is usually passed along the “daisy chain” along w/ data
 Leads to increased difficulty in board-level designs to minimize
losses
 When designing for manufacturability, must provide for worst-
case scenario
– e.g. A 4 fixture chain powered by 24V @ 1A
– Power only comes into first board so it must carry current for
all other boards to the output connector
– Size traces accordingly
– Minimize distances between input and output
 EMI Critical for offline applications
 LED fixtures held to same EMI standards as traditional lighting
sources
 Difficult to design for EMI with PWM implications

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PCB Design Considerations (Cont’d)
 Thermal issues:
 Transistors switching LEDs will generate heat
 LEDs themselves generate heat (~25% efficient)
 Thermal solutions:
 Metal Core PCBs popular for heat dissipation
 Mechanical integration key for heat sinking / thermal flow
 Temperature monitoring via onboard thermistors
– Thermal shutdown or compensation
– Active over LED lifetime

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PCB SMT assembly Solutions
6 Months ROI
One line equipments Investment: $120k
40K T8 LED tubes/ Day
SMT Assembly earning $0.05 /Tube
Profit: $50K per month

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Fast then Fast
—Actual Speed: 120K CPH
(one pick & place cycle: 1 sec)
—36 nozzles: Gang pick/Gang Place
—2 Placement head: Linear motor
—Smart Feeder: 100% compatible NXT
—Cross platform: PCB size 1.2x0.3m

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Lower then Lower cost
Creative Nozzle: Life cycle > 1 year
(Unit price for nozzle: $6.00)
Less and less PM
Saving power consumption: 3KW
One line space: 5 lines throughput

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Totally Support
7x24 supporting respond
Worldwide Installation and on site support
Factory (machine and lighting assembly) training
2 years warranty for whole machine

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Welcome inquiry
1,Please visit : www.smthelp.com
2, Find us more: https://www.facebook.com/autoinsertion
3, Know more our team: https://cn.linkedin.com/in/smtsupplier
4, Welcome to our factory in Shenzhen China
5, Look at machine running video: https://youtu.be/LdpOUo_1vLk
4, See more in Youtube: Auto+Insertion