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Circuit Protection for LED

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LED Driver Topologies - BUCK. NbO or High CV MLCC (Depending on input voltage) Buck, or step-down, voltage converters produce an average output voltage lower ... – PowerPoint PPT presentation

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Title: Circuit Protection for LED


1
Circuit Protection
Circuit Protection for LED
AVX Lights The Way
2
The Power Of LightLighting the way Forward
Old Technology
Next Generation Technology
Current Technology
3
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

4
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

5
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

6
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
7
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
8
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
9
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
10
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
11
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