TI LED Lighting Solution Overview Daniel Gomez FAE Avnet
Agenda
• Basics of LEDs
• AC/DC LED Lighting Solutions
– Residential and retrofit lighting driver solutions
TI Confidential2
– Residential and retrofit lighting driver solutions
• TPS92xxx based LED lighting drivers
– Commercial lighting driver solutions
• UCC28810EVM-002 based LED lighting driver
– Outdoor and infrastructure lighting driver solutions
• SIMPLEDrive (UCC28810EVM-003) multi-string driver
Why do LEDs need Drivers?
• LEDs are low DC voltage
devices
• Most LEDs are relatively low
current devices (less than 1A)
• LED light modules consist of a
combination or series and
parallel strings
• Control is needed for LED
current regulation and dimming
functions
• Hence LED lighting luminaires
need Drivers
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parallel strings
• Input power sources rarely
match the voltage and current
requirements of the LED Array
LED Driver
LED Array (Module),
Package or Lamp
. . .
. . .
. . .
. . .
. . .
Control
Power Source
or
or
or ?Power
Supply
Driving LEDs – series, parallel or both?
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Single Series LED string
� Always preferred method
� Good for residential and
commercial applications
� Voltage and Safety issues
with higher # of LEDs
Series-Parallel LED Strings
� Cost Effective way to drive
more light with low cost and component impact on LED Driver
Parallel LED strings
� Best performance for high
lumens applications
(Outdoor and High Bay)
� Most Expensive Driver
Solution
LEDs connected in Series
Pros
• Perfect current matching per LED
• Single constant current driver
• Lowest component count and cost
Cons
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• Will generate high voltages for high # of LEDs
• Complicates thermal design and safety certification
• Hence limited to low power applications
• Open string loses all light output
LEDs connected in Series-Parallel
Pros• Drives multiple strings with single constant current driver
• Keeps LED current driver component count low
• Maintains reasonably low voltage per string
• Simplifies thermal design and safety certification
• opens string will cause will cause more current in the good string (some compensation for light output)
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string (some compensation for light output)
Cons• Current sharing per string is not perfect
• Open string will put more burden on remaining LEDs
LEDs connected in Parallel
Pros
• Each string maintains programmed LED current
• Most flexibility to control individual string
• Maintains reasonably low voltage per string
• Simplifies thermal design and safety certification
• Open string will result in only that string failing, the rest of luminaire is lit
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• Open string will result in only that string failing, the rest of luminaire is lit
up.
Cons
• Require one constant current driver per string
• Increases component count, cost and failure rate
LED General Illumination Applications
LED Lighting
Residential
< 25W or
3,000 lm
Commercial
15W – 75W or
1000 lm - 10000 lm
Outdoor and Infrastructure
35W – 250W
2500 lm - 30,000 lm
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Driver Topologies Driver Topologies Driver Topologies
Buck, Boost, Buck Boost, SEPIC
and Flyback
Buck, Boost, Buck Boost, SEPIC
and Flyback
PFC Boost, Flyback Half-Bridge,
Buck, Multi-string
Street Light Area Light Flood LightE14 E27/A19 PAR38
LED String configuration
single string
LED String configuration
single string, some parallel
LED String configuration
single string, some parallel,
Individual control of many strings
MR16 ArchitecturalDisplay Case Retail Display
LED General Illumination Applications
LED Lighting
Residential
< 25W or
3,000 lm
Commercial
15W – 75W or
1000 lm - 10000 lm
Outdoor and Infrastructure
35W – 250W
2500 lm - 30,000 lm
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Low Cost, TRIAC Dimming,
PFC, High Efficiency, Color
Quality, Safety, Long Life
PFC, High Efficiency,
Dimming, Early Payback, Color
Quality, Safety, Maintenance,
Eco-friendly
PFC, High Efficiency,
Early Payback, High
Brightness, Safety,
Maintenance, Eco-friendly
TPS92010
TPS92210
TPS92001/2
UCC28810
UCC28811
UCC28810
UCC28811
Street Light Area Light Flood LightE14 E27/A19 PAR38
TPS92010EVM-592 (110V)
TPS92010EVM-631 (230V)
TPS92210EVM-613
UCC28810EVM-002
UCC28810EVM-003UCC28810EVM-003
MR16 ArchitecturalDisplay Case Retail Display
Residential
Lighting LED Driver Solutions
Key Factors
• Low Cost
• High Efficiency
• Power Factor Correction
(<25W Applications)
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• Power Factor Correction
• TRIAC Dimmer Compatible
• Color Quality
• Long Life
The Trouble with TRIACs
Light
Bulb
R1 C1
TRIAC
Wall dimmer
AC
Input
Dimmer
Output
L
N
DIAC
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• Start of AC cycle TRIAC initially off
– C1 charges through R1 and light bulb
• When voltage on C1 exceeds DIAC threshold voltage the TRIAC conducts
– R1 controls when TRIAC turns ON, dimming function
• Light bulb load must maintain TRIAC holding current
– TRIAC turns off close to zero crossing and cycle repeats
• LED lights do not always consume enough power to keep TRIAC ON
– Need to solve this with extra circuitry
Special care is required when making LED lighting compatible to standard TRIAC dimmers
• High Efficiency LED Lighting Current
• Quasi resonant and low power modes
• High Performance TRIAC Dimming with
Application Circuit
• Programmable Overvoltage Protection
• Internal Over-temperature Protection
• Current Limit Protection
� Cycle-by-Cycle Power Limit
� Primary Side Overcurrent Hiccup
TPS92010High Efficiency Offline LED Lighting Controller
• 87% Achievable Efficiency – Higher than
Standard Flyback Topologies
• Less than 400mW Standby Current Allows
Efficient Deep Dimming
• 20% More Efficient Dimming compared with
Other Methods
• Safely Shuts Down Driver if Open or Over
Temperature Condition is present
• Protects Driver from Abnormal Conditions
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� Primary Side Overcurrent Hiccup
Restart Mode
• TrueDrive Gate Drive 1A sink, 0.75A Source
• Residential LED Lighting Drivers
• Drivers for Wall Sconces, Pathway and Overhead
Lighting
• Drivers for Wall Washing, Architectural and
Display Lighting
• Protects Driver from Abnormal Conditions
• Lower Switching Losses Reducing System Cost
TPS92010EVM 6Watt LED Lighting Driver
Key Features
• 120V and 230V input designs
• Tightly Regulated LED current
• Compatible with standard TRIAC
Dimmers
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Dimmers
• Near Lossless Deep Dimming
• High Efficiency
– Maintained during dimming
TPS92010EVM-592 Specification
Specification Value Unit
LED configuration 5 Ser.
Input Voltage 100 - 130 VAC
Efficiency 84 %
Power 6 W
Specification Value Unit
Dimming Input Triac
Dimming Level 0-100 %
Current Sensing Res.
Current Ref
Accuracy
3 %
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Power Factor 0.55
Output Voltage 14 - 18 VDC
Output Current 325 mA
LF Output Ripple 0 mVpp
Isolation Yes
Temp. Range -20 to 50 oC
Lifetime* 35000 Hrs
Turn on time 150 mS
EMC Regulation FCC B
Safety Regulation No
Driver Dimensions 60 X 20 mm
Note: *Lifetime assumes 35oC internal temp. rise from ambient.
TPS92010EVM-631 Specification
Specification Value Unit
LED configuration 5 Ser.
Input Voltage 185 - 265 VAC
Efficiency 85 %
Power 6 W
Specification Value Unit
Dimming Input Triac
Dimming Level 0-100 %
Current Sensing Res.
Current Ref
Accuracy
3 %
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Power Factor 0.55
Output Voltage 14 - 17 VDC
Output Current 325 mA
LF Output Ripple 0 mVpp
Isolation Yes
Temp. Range -20 to 50 oC
Lifetime* 35000 Hrs
Turn on time 150 mS
EMC Regulation FCC B
Safety Regulation No
Driver Dimensions 60 X 20 mm
Note: *Lifetime assumes 35oC internal temp. rise from ambient.
TPS92010EVM Schematic
LM385
Input Filter
Flyback
Power Stage
LED Current
Control
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Near Lossless
Dimming Trigger LM385
Set Point
Generation
• Efficiency Measured with
a 5 LED Series String at
300mA
• Voltage across the string
is approximately 16.25V
• Dimming Efficiency
TPS92010EVM Efficiency
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• Dimming Efficiency
includes TRIAC losses
• Flat efficiency down to less
than 1/3 load
• Maintains high efficiency
down to 0.5W of delivered
power to LED loads
TPS92010EVM Dimming Performance
• Traditional problems TRIAC
triggering and holding
currents with LED lighting are
solved.
• Dimmer triggering provides
loading of the TRIAC at AC
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loading of the TRIAC at AC
line crossover for proper
dimmer operation.
• DC current during dimming
– No audible noise
• Steady deep dimming
– Two Step dimming pleasing to
eye
TPS92010EVM EMC Performance
• Conducted EMI Results at 120V input
• Measurement used peak detector.
– Upper limit line is Class B Quasi-Peak, Lower is Class B Average.
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Passes EMI FCC Class B Quasi-Peak Level – Can be optimized further
TPS92010Reference Designs Available
PMP # Device D.S. # LEDS VIN VOUT IOUT(mA) TRAIC Dimming ISO Topology
3522 TPS92010 INDIA 6 90-300 21 350 � � SEPIC
3526 TPS92010 INDIA 5 120-300 20 350 � � SEPIC
3527 TPS92010 INDIA 5 120-288 18 350 � � SEPIC
3529 TPS92010 INDIA 6 120-275 21 350 � � SEPIC
3530 TPS92010 INDIA 4 120-275 16 700 � � Isolated SEPIC
3539 TPS92010 INDIA 3 120-275 12 700 � � Isolated SEPIC
3542 TPS92010 INDIA 4 120-275 14 700 � � Isolated SEPIC
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3547 TPS92010 INDIA 6 120-275 24 700 � � Isolated SEPIC
3560 TPS92010 INDIA 15 120-288 60 700 � � Isolated SEPIC
- TPS92010EVM-592 LPP 5 110-130 16.5 325 � � Flyback
- TPS92010EVM-631 LPP 5 185-265 16.5 325 � � Flyback
TPS92010 Lighting Solution Summary
Triac Dimmable for light bulb replacement applications
• Small form Factor - 3W to 12W applications
• High efficiency
• Deep Dimming Capability
Key Differentiator
For low power lighting applications that
Do Not require Power Factor Correction
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Key Differentiator
• Licensed IP for Lossless Dimming Circuit
Competitors dimming techniques dissipate more power at deep dimming levels than the power consumed driving the LEDs!
The Losses in the dimming circuit also adds to the heat which reduces system life and reliability
• Ideal for Single Stage LED Driver Designs
• Isolated and Non-isolated Topologies
• TRIAC Dimmable Application Circuit
• 30% Fewer external components
• Convenient 5V Reference Output
• Under-voltage Lockout for Safe Operation
• 0.4A Source/0.8A Sink FET Driver
TPS92001/2General Purpose LED Lighting PWM Controller
• Power Factor > 0.7
• Adds LED Load Flexibility
• Low Cost Deep Dimmable Solution
• High Density-Small Form Factor
• Power For µController or Linear Circuits
• Protects Driver from Abnormal Conditions
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• Retrofit LED bulbs – A19, PAR30/38, GU10
• Residential LED Lighting Drivers
• Drivers for Wall Sconces, Pathway and Overhead
Lighting
GND
REF
RTC GD
VDD
CS
RTD
SS
5
6
7
81
2
3
4
TPS92001
Linear
RegEMI
Filter
TRIAC
Dimming
Control
TPS9200111W LED lighting Driver
• 120V input design
• Regulated LED Power
• Compatible with TRIAC Dimmers
– 0% to 100% Range
– Maintains TRIAC holding current
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• High Efficiency
– Maintained when dimmed
– Flat over line input range
• Design available with no Aluminum Electrolytic capacitors
TPS92001PMP5163 Reference Design Spec
Specification Value** Unit
LED configuration 5 (9)
Input Voltage 108-132 VAC
Efficiency 80 (84) %
Power 6 (11) W
Specification Value Unit
Dimming Input TRIAC
Dimming Level 0-100 %
Current Sensing Res
Current Ref
Accuracy
N/A %
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Power Factor 0.74 (0.82)
Output Voltage 15.2 VDC
Output Current 329 mA
LF Output Ripple 400 mVpp
Isolation None VAC
Temp. Range -20 to 50 oC
Lifetime* 40,000 Hrs
Turn on time 150 mS
EMC Regulation FCC B
Safety Regulation No
Driver Dimensions 32x60 mm
Note: * Lifetime assumes 35oC internal temp. rise from ambient.
** Values in brackets are for 9 LED load
Current Control
Low Side Buck
+
+
TPS92001PMP5163 Reference Design Schematic
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Deep Dimming Circuit
Dummy Load Added During
Deep Dimming
TPS92001
TPS92001PMP5163 Reference Design Schematic
No Aluminum Electrolytic Capacitors
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TPS92001
TPS92001Reference Designs Available
PMP # Device D.S. # LEDs VIN VOUT IOUT(mA) TRAIC Dimming ISO Topology
3021 TPS92001 US 100-305 80 700 Boost-Flyback
3155 TPS92001 US 85-132 51 350 Buck-Boost
3220 TPS92001 US 85-132 51 Buck-Boost
3239 TPS92001 US 85-132 51 Buck-Boost
4150 TPS92001 US 17 85-132 51 350 Buck-Boost
4157 TPS92001 US 1 250-400 4.5 4.7-2 Flyback
4547 TPS92001 US 1-4 180-265 4-15 700 Buck
4872 TPS92001 US 10 108-132 30 350 Buck
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4885 TPS92001 US 108-132 350 Buck
4886 TPS92001 US 108-132 350 Buck
4981 TPS92001 US 108-132 350 Buck
5013 TPS92001 US 10 108-132 350 Upside Down Buck
5014 TPS92001 US 6 108-132 700 Upside Down Buck
5100 TPS92001 US 6 500 Inverted Buck
5101 TPS92001 US 12 350 Inverted Buck
5163 TPS92001 US 108-132 350 � � Buck
5198 TPS92001 US 250-305 28 350 Buck
For low to medium power lighting applications
that require Power Factor Correction
Isolated and Non-isolated versions available
TPS92001PMP5163 Lighting Solution Summary
Triac Dimmable for light bulb replacement applications
• Non Isolated Single Stage Solution for Lowest System cost
(PFC + LED Current Regulation)
• Small form Factor - 6W to 11W applications
• High efficiency
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• Deep TRIAC Dimming Capability
• Power factor excellent due to power modulation scheme.
• Very Low THD
• No electrolytic capacitors option
Key Differentiator
• Single power conversion stage meets regulatory power factor requirements and
provides tight LED current regulation with deep TRIAC dimming, lower total system
cost!
TPS92210PFC LED lighting driver controller
• Flexible Operation Modes: Peak Primary Current,
Constant On-Time or both
• Cascoded MOSFET Configuration
• Works with TRIAC dimmers
• Transformer Zero Energy Detection
• DCM or TM operation
• Advanced Over-current Protection
• Over-voltage protection
• Constant On-Time implements single stage PFC
• Fast and easy start up
• Line Surge Ruggedness better than Internal HV FET
• Continuous linear dimming
• Proven applications with TRIAC dimmers
• High Efficiency, low EMI
• No reverse recovery loss in output rectifier
• Smaller Size and Lower System Cost
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• Residential LED Lighting Drivers
•A19 (E27/26, E14), PAR30/38, GU10
• Drivers for Wall Sconces, Pathway and Overhead
Lighting
• Drivers for Wall Washing, Architectural and
Display Lighting
• Commercial Troffers and Downlights
TPS92210EVM Specification
Specification Value Unit
LED configuration 9-11
Input Voltage 90-130 VAC
Efficiency 85 %
Power 12.5 W
Specification Value Unit
Dimming Input TRIAC
Dimming Level 0-100 %
Current Sensing Res
Current Ref
Accuracy
3 %
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Power Factor 0.99
Output Voltage 38 VDC
Output Current 350 mA
LF Output Ripple 300 mVpp
Isolation 2500 VAC
Temp. Range -20 to 50 oC
Lifetime* 35000 Hrs
Turn on time 150 mS
EMC Regulation FCC B
Safety Regulation
Driver Dimensions 34 dia mm
Note: *Lifetime assumes 35oC internal temp. rise from ambient.
TPS92210Reference Designs Available
PMP # Device D.S. # LEDs VIN VOUT IOUT(mA) TRAIC Dimming ISO Topology
3649 TPS92210 INDIA 5-9 85-280 16-30 350 � � Flyback
3661 TPS92210 INDIA 24 85-270 80 350 � � Flyback
4956 TPS92210 US 6 100-305 20 800 � � Buck
5170 TPS92210 US 14 320-410 42 700 � � Flyback
6001 TPS92210 LPP 11 90-265 38 350 � � FlybackNew
New
New
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For low to medium power lighting applications
that require Power Factor Correction
TPS92210EVM Lighting Solution Summary
Triac Dimmable for light bulb replacement applications
• Single Stage Solution (PFC + LED Current Regulation)
• Small form Factor - 12W to 25W applications
• Deep TRIAC Dimming Capability
• Isolation is optical – compatible with safety standards
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• Excellent efficiency even during dimming
• Life Limited by the Elec Caps
• Power factor excellent due to power modulation scheme.
• Very Low THD
Key Differentiator
• Single power conversion stage meets regulatory power factor requirements and provides tight LED current regulation with deep TRIAC dimming, lower total system cost!
Low Power Light Bulb Replacement
Cost/Performance Matrix
Solution Power Safety
Output Ripple
Current
Power
Factor
TRIAC Dimming
TPS92210EVM 15W Isolated ~ 25%
Depends on Output
Capacitance
0.99 Standard
Performance/Cost
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TPS92010EVM 6W Isolated DC 0.55 Lossless
PMP5163
(TPS92001)
6W- 11W Non-Isolated 100% - 120Hz 0.72 StandardPerformance/Cost
Features
Commercial, Outdoor and Infrastructure
Lighting LED Driver Solutions
Key Factors
• PFC
• High Efficiency
• Dimming
(15W to 250W Applications)
TI Confidential36
• Early Payback (low cost)
• Uniform Intensity
• Safety
• Low Maintenance
UCC28810/1
LED Lighting Power Controller
• Transformer Zero Energy Detection
• Transition Mode Control
• Implements Single Stage Power Factor Correction
• Application circuit implements industry standard
phase-cut dimming
• Advanced Transient Response, Accurate Internal
Vref, Low Startup Current, 750 mA gate drive current
• UVLO, OVP and Open Loop Detection
• Low Cost, High Efficiency and Low EMI
• Achieves lighting standards requirements,
reduces cost and size
• Dimming of LED fixture achieved without
changing wall dimmer
• Cost Effectively improves performance of LED
driver
• Improves reliability and life time of lighting fixture
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• AC input General Illumination HB LEDs Applications
• Commercial, Residential, Industrial Lighting Fixtures
• Outdoor Lighting: Street, Roadway, Area, Parking
• UVLO, OVP and Open Loop Detection • Improves reliability and life time of lighting fixture
UCC28810/11Reference Designs Available
PMP # Device D.S. # LEDs VIN VOUT IOUT(mA) TRAIC Dimming ISO Topology
2731 UCC28810 US 90-264 40 700 PFC SEPIC
3976 UCC28810 US 150-264 275 350 PFC SEPIC
4501 UCC28810 US 180-265 48 700 PFC Flyback
4518 UCC28810 US 108-305 50 1400 PFC Flyback
4522 UCC28810 US 200-264 120 350 PFC Flyback
4530 UCC28810 US 85-132 80 2000 PFC Flyback
4534 UCC28810 US 180-265 12 3500 PFC Flyback
4601 UCC28810 US 85-265 6.5 2200 PFC Flyback
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4604 UCC28810 US 150-265 95 700 PFC Flyback
4615 UCC28810 US 200-307 80 2000 PFC Flyback
4618 UCC28810 US 180-265 48 700 PFC Flyback
4625 UCC28810 US 180-265 50 1400 PFC Flyback
4636 UCC28810 US 180-265 59 2500 PFC Flyback
4655 UCC28810 US 18-50 6.5 3000 PFC Flyback
4692 UCC28810 US 180-265 48 700 PFC Flyback
4708 UCC28810 US 85-265 6.5 2200 PFC Flyback
4715 UCC28810 US 180-265 28 1400 PFC Flyback
UCC28810/11Reference Designs Available
PMP # Device D.S. # LEDs VIN VOUT IOUT(mA) TRAIC Dimming ISO Topology
4718 UCC28810 US 200-264 120 350 PFC Flyback
4719 UCC28810 US 90-264 300 350 TM Boost + TM Buck
4722 UCC28810 US 90-265 24 2000 PFC Flyback/Buck
4731 UCC28810 US 90-264 50 700 PFC Boost+LLC
4833 UCC28810 US 90-264 275 350 PFC SEPIC
4862 UCC28810 US 3 x 24 150-264 350 PFC Flyback/Buck
5039 UCC28810 US 85-265 275 350 PFC SEPIC
5054 UCC28810 US 3 x 24 85-265 350 PFC Flyback/Buck
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5055 UCC28810 US 3 x 24 95-305 350 PFC Flyback/Buck
5112 UCC28810 US 95-305 150 500 PFC SEPIC
5242 UCC28810 US 85-265 208 110 PFC SEPIC
5405 UCC28811 US 30-60 85-265 350 PFC SEPIC
5434 UCC28810 US 150-264 275 350 PFC SEPIC
UCC28810EVM-002 100W LED Lighting
Driver • Universal input non isolated design
• Regulated LED current
• PWM Dimming, 200Hz to 1kHz
• High Efficiency
– Maintained during dimming
• Active power factor correction
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• Active power factor correction
UCC28810EVM-002 Specification
Specification Value Unit
LED configuration 15 to 30
Input Voltage 90 to 264 VAC
Efficiency 93 %
Power 100 W
Specification Value Unit
Dimming Input PWM
Dimming Level 10 to 100 %
Current Sensing Res
Temp. Range -20 to 40 oC
Lifetime* 40,000 Hrs
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Power Factor 0.97
Output Voltage 109 VDC
Output Current 900 mA
LF Output Ripple 0 mVpp
Isolation None
EMC Regulation No
Safety Regulation No
Driver Dimensions 265 x 51 mm
Note: *Lifetime assumes 35oC internal temp. rise from ambient.
UCC28810EVM-002 Block Diagram
1st stage: TM Boost for PFC 2nd stage: TM Buck for LED current
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Applications
• LED Street & Roadway Lighting
• LED High Bay Industrial Lighting
• DTV LED backlighting
High-Light Output Drivers
Traditional ImplementationSupply with PFC, Low Voltage DC output LED Strings Driven with Multiple Buck Regulators
Power Supply (with PFC)
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PFC Stage -> Required in any implementation
DC-DC Stage -> Provides constant voltage and isolation stage
Multiple Bucks -> Provides constant current to each LED string
Benefit:
• Allows for individual string dimming
Drawbacks:
• Controller and MOSFET and Inductor required for each LED string
• Decreased reliability due to many extra converters
High-Light Output Drivers
PFC + Buck + Multiple StringsSIMPLEDrive: PFC + DC-DC + Multiple Buck stages
TI Confidential45
PFC Stage -> Required in any implementation
Low Side Buck -> Provides constant LED Current and main control
Series Transformers -> Provides constant current to each LED string
Benefit:
• One control section for all string currents,
• Lower part count, higher reliability and lower cost
Drawback:
• All strings will be dimmed simultaneously (if individual dimming is required)
Series Input, Multiple Parallel Equivalent LED Drive (SIMPLEDrive )
UCC28810EVM-003 - SIMPLEDrive™
1st stage:
TM Boost for PFC
2nd stage:
TM Buck for LED current
3rd stage:
Resonant Current Half Bridge
TI Confidential46
http://focus.ti.com/docs/toolsw/folders/print/ucc28810evm-003.htm
l
LEDs connected in ParallelPros• Each string maintains programmed LED current
• Most flexibility to control individual string
• Maintains reasonably low voltage per string
• Simplifies thermal design and safety certification
• Open string will result in only that string failing, the
Recalling the Pros and Cons of LED Strings connected in parallel
TI Confidential
• Open string will result in only that string failing, the
rest of luminaire is lit up.
Cons• Require one constant current driver per string
• Increases component count, cost and failure rate
SIMPLEDrive™ features
• Better than 1% LED current matching between strings
• Highest quality Uniform light output
• High Efficiency (~90%), Resonant Topology
– Higher efficiency achievable through narrower - non universal input voltage range
• Readily scalable to higher or lower power levels (ideal for modular solution)
• Isolated topology – String voltage safety within SELV levels
• More cost effective than constant voltage + 1 Buck per string architecture
• No secondary to primary feedback required (no opto) – (closed loop on primary side)
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• No secondary to primary feedback required (no opto) – (closed loop on primary side)
• PWM or Amplitude modulation dimming
• Active Power Factor Correction.
• Improved reliability through simple open LED string protected
Patent Pending architecture
Applications
• LED Street & Roadway Lighting
• LED High Bay Industrial Lighting
• DTV LED backlighting
UCC28810EVM-003 Specification
Specification Value Unit
LED configuration 4 x 15
Input Voltage 90 to 264 VAC
Efficiency 90 %
Power 100 W
Specification Value Unit
Dimming Input PWM
Dimming Level 10 to 100 %
Current Sensing Res
Temp. Range -20 to 80 oC
Lifetime* 40,000 Hrs
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Power Factor 0.97
Output Voltage 54.5 VDC
Output Current 500 mA
LF Output Ripple 0 mVpp
Isolation Yes
EMC Regulation No
Safety Regulation Yes**
Driver Dimensions 370 x 51 mm
Note: *Lifetime assumes 35oC internal temp. rise from ambient.
** Designed with reinforced isolation to UL60950 but not certified
UCC28810EVM-003 using SIMPLEDrive
Efficiency
86
87
88
89
90
91 Efficiency - %
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80
81
82
83
84
85
25 50 75 100
Load - % PWM Dimming
Efficiency - %
VIN = 90V
VIN = 115V
VIN = 230V
VIN = 264V
UCC28810EVM-003 Open String Protection
• If one string fails the other remain on.
• Each output incorporates a zener and SCR crowbar circuit
– D2, SCR1, R1 and R2
• When string fails, zener voltage is exceeded and SCR latches on
• Transformer continues to deliver current to SCR and LED String #2
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Waveforms During Normal Operation