Title: Circuit Protection for LED
1 Circuit Protection
Circuit Protection for LED
AVX Lights The Way
2The Power Of LightLighting the way Forward
Old Technology
Next Generation Technology
Current Technology
3LED 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
4What 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
5LED 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
6LED 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
7LED 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
8LED 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
9LED 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
10High 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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