Circuit Protection for LED

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Circuit Protection
Circuit Protection for LED
AVX Lights The Way
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The Power Of LightLighting the way Forward
Old Technology
Next Generation Technology
Current Technology
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LED Applications

• Architectural lighting
• Discrete LED lighting
• Display case lighting
• Electronic signs
• Mass transit lighting and signaling
• Theatrical lighting
• Traffic signals
• Under cabinet lighting
• Automotive lighting
• Indoor/Outdoor lighting
• Laptops/portable displays

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What is Driving the Lighting Market to LED and
SSL?

• Why are LEDs being used in new lighting
  applications?
• Rising cost of energy
• Falling cost of technology
• LED cost per lumen decreased by 30 over the
  past year
• Government regulations
• RoHs (reduction in mercury content impact CFL
  devices)
• Emissions reduction targets
• Building performance requirements
• Increase in use of lighting controls
• Energy efficiency requirements

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LED Circuit Protection

• LED light output is directly proportional to the
  forward current
• More Power brighter lights
• More Power more need for capacitors and LOW
  LEAKAGE circuit protection equipment
• A drive/control circuit must be used to control
  the LEDs current
• More ICs increased component count
• LEDs reverse breakdown voltage usually low (5V
  to 10V)
• The designer must be careful to insure
• protection of the device
• LEDs are ESD sensitive
• More opportunities for varistor based product

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LED Driver Topologies - Linear
T-Guard VC06LC18X500
NbO or High CV MLCC (Depending on stack voltage)
Note TransGuard operating voltage should be /gt
than the LED stack applied voltage
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LED Driver Topologies - BUCK
NbO or High CV MLCC (Depending on output voltage)
T-Guard VC04LC18X500
NbO or High CV MLCC (Depending on input voltage)
Buck, or step-down, voltage converters produce an
average output voltage lower than the input
source voltage.
Note TransGuard operating voltage should be /gt
than the LED stack applied voltage
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LED Driver Topologies - BOOST
T-Guard VC04LC18X500
NbO or High CV MLCC (Depending on output voltage)
NbO or High CV MLC High Voltahe RMS MOV/MLV
Boost, or step-up, converters produce an average
output voltage higher than the input source
voltage.
Two AVX Caps!
Note TransGuard operating voltage should be /gt
than the LED stack applied voltage
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LED Driver Topologies BUCK / BOOST
T-Guard VC04LV18X500 Or VC06AG183R0YAT
C2
NbO or High CV MLCC (Depending on input voltage)
NbO or High CV MLCC (Depending on input voltage)

• A combination of buck and boost.
• Output is inverted, and its magnitude can be
  less or
• greater than the input.

Note TransGuard operating voltage should be /gt
than the LED stack applied voltage
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High Current/Multiple LEDs
TransGuard VC06LC18X500
1KV, 222pf HV Ceramic
2220 w flexiterm
Oxicap or HiCV
HiCV or Oxicap

• AVX Solution
• 9 AVX Capacitors
• 1 Varistor
• 1 fuse
• multiple connectors!

Oxicap or HiCV
Note TransGuard operating voltage should be /gt
than the LED stack applied voltage
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