About Us | News | Blog | My Bourns | Partner Portals | Sales | Contact | Careers |  
Products Services Applications Design Tools Library Support RoHS Training
 
Site Search       Advanced Search  
Products
Automotive
Circuit Protection
ChipGuard® ESD Suppressors
ChipGuard® ESD Suppressors - AEC-Q200 Qualified for Automotive Applications
Gas Discharge Tube (GDT) Surge Arrestors
Hybrid Protectors - MSP®
LED Shunt Protectors (LSPs)
Line Protection Modules
Metal Oxide Varistors (MOV)
Resettable Fuses - Ceramic PTC
Resettable Fuses - Multifuse® PPTC
Power TVS Products
SinglFuse™ Thin Film Chip Fuses
Telefuse™ Telecom Protectors
Thyristor Surge Protectors
TBU® High-Speed Protectors (HSPs)
TCS™ High-Speed Protectors (HSPs)
TVS Diodes
TVS Diode Arrays
CO & Outside Plant Products
Connectors
Diodes
Encoders
LED Shunt Protectors
Magnetic Products
Microelectronic Modules
Position Sensors
Potentiometers
Resistive Products
Surge Protective Devices (SPDs)
Switches
Switching Spark Gap
 
 
Services
Specialty Engineering and Manufacturing Services (SEMS)
 
 
 
  Skip Navigation LinksProducts    Circuit Protection    LED Shunt Protectors (LSPs)
Bourns - POC - Product Detail Page
 
 
LED Shunt Protectors (LSPs)
Summary
In LED Lighting applications, solid-state lighting luminaires are commonly configured with long strings of multiple series LEDs driven from a relatively high voltage compliance, constant current power supply.

This configuration has several benefits:
  • Multiple LEDs can be arranged in series to simplify the power supply design.
  • High voltage, low current power supply improves efficiency of the power supply.
  • Modular design can allow easy scaling; for example, using 1 W LEDs - 8 W, 16 W, 24 W or 32 W designs can easily be created with multiple strings of 8 x 1 W LEDs.
  • One LED streetlight design uses six strings of 15 LEDs for a total of 90 LEDs.

The LSP product is designed to make the open LED failure mode tolerable. An open LED will cause a complete LED string to go dark, rendering the application useless or markedly compromised. This can lead to warranty returns or maintenance calls.

To comply with Energy Star® rating, LED lighting fixtures must:
  • Have a 3 year warranty
  • Produce >70 % of new light output for 35k hours (residential: 25k hours).

While low power LED string designs may have used zener diodes in this role, high power LEDs would require very large and expensive zeners. Placing a Bourns® LSP device across LEDs allows the remaining LEDs in a string to continue to work when an LED fails open circuit. LSP devices in active mode dissipate less power than the LED did.
 
Series LSP0600 LSP0600 LSP0900 LSP0900 LSP1300
Photo
Type LED Shunt Protector LED Shunt Protector LED Shunt Protector LED Shunt Protector LED Shunt Protector
Package BJR
AJR
BJR
AJR
BJR
Repetitive Peak Off-State Voltage Symbol: VDRM / unit: V 6.0 6.0 9.0 9.0 13.0
Minimum Holding Current @ IT = 1 A Symbol: IT / unit: mA 5 5 5 5 5
Maximum On-state Voltage @ IT = 1 A Symbol: VT / unit: V 1.2 1.2 1.2 1.2 1.2
Absolute Rating Electrical Characteristics (@ TA = 25 °C Unless Otherwise Noted) Electrical Characteristics (@ TA = 25 °C Unless Otherwise Noted) Electrical Characteristics (@ TA = 25 °C Unless Otherwise Noted) Electrical Characteristics (@ TA = 25 °C Unless Otherwise Noted) Electrical Characteristics (@ TA = 25 °C Unless Otherwise Noted)
RoHS Compliant SMB
SMA
SMB
SMA
SMB
Design Files Available Available Available Available Available

Top of Page

Series LSP1300 LSP1800 LSP1800
Photo
Type LED Shunt Protector LED Shunt Protector LED Shunt Protector
Package AJR
BJR
AJR
Repetitive Peak Off-State Voltage Symbol: VDRM / unit: V 13.0 18.0 18.0
Minimum Holding Current @ IT = 1 A Symbol: IT / unit: mA 5 5 5
Maximum On-state Voltage @ IT = 1 A Symbol: VT / unit: V 1.2 1.2 1.2
Absolute Rating Electrical Characteristics (@ TA = 25 °C Unless Otherwise Noted) Electrical Characteristics (@ TA = 25 °C Unless Otherwise Noted) Electrical Characteristics (@ TA = 25 °C Unless Otherwise Noted)
RoHS Compliant SMA
SMB
SMA
Design Files Available Available Available

Top of Page