Conventional drivers use constant current control to precisely adjust the LED forward current. This method allows LEDs in the same bin to produce consistent light output and brightness. However, once the current is supplied to the LED, the solder joint temperature rises, causing the forward voltage to drop and the efficiency to decrease. Conversely, with the latest LM3447, which supports constant power regulation, the LED forward voltage that decreases with temperature can be resolved by boosting the LED current, maintaining constant LED power. This increases efficiency by up to 10% over the entire luminaire operating temperature range.
The LM3447 is part of TI's line of offline LED lighting controllers, including the industry's first phase dimmable LED driver NationalLM3445 with constant current control technology and the TPS92310 primary side regulator for non-dimming applications.
Key features and benefits of the LM3447 LED driver
Integrated phase dimmer decoding and dimming detection circuitry supports convenient design and maximum efficiency;
Support for leading edge (TRIAC) and trailing edge dimmers;
Primary side control supports isolated lighting design without optocoupler;
Constant power LED load regulation can improve the efficiency of the LED light group and compensate for the temperature change of the LED contact;
The fixed frequency discontinuous conduction mode flyback topology supports the valley switching function to simplify EMI filter design;
Power factor correction greater than 0.9, fully meet all regulatory requirements;
Thermal feedback not only provides over-temperature protection for LED groups, but still supports lower light output;
LED open and short circuit protection and driver IC thermal shutdown prevent lamp electronics from damaging in the event of a fault.
Single Mode Fiber Patch Cord is a single stand of glass fiber with a diameter of 8.3 to 10 microns that has one mode of transmission. Single Mode Fiber with a relatively narrow diameter, through which only one mode will propagate typically 1310 or 1550nm. Carries higher bandwidth than multimode fiber, but requires a light source with a narrow spectral width. Synonyms are mono-mode optical fiber, single-mode fiber, single-mode optical waveguide, uni-mode fiber.
Single-mode fiber gives you a higher transmission rate and up to 50 times more distance than multimode, but it also costs more. Single-mode fiber has a much smaller core than multimode. The small core and single light-wave virtually eliminate any distortion that could result from overlapping light pulses, providing the least signal attenuation and the highest transmission speeds of any fiber cable type.Single-mode optical fiber is an optical fiber in which only the lowest order bound mode can propagate at the wavelength of interest typically 1300 to 1320nm
Single Mode Fiber Patch Cord
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