Temperature Effects to PCB Board

The color of the LED change with temperature, so as to wavelength. As the temperatureof Die increases, the wavelength of the color increases. It is very important with white LED light. The eye can distinguish man from small changes in color in white light. IF die in a table populated Sindh performance, provides a thermal resistance of a current in the other a smooth and uniform color LED. Due to the relatively low thermal resistance to heat provides Clad FR-4 stream temperature is less thermal resistance in small differences in the transition happens with epoxy or eutectic affected binding techniques. Is it possible at the disposal of the packaging assembly sector A solid, founded by dying some good thermal management techniques used, reducing the impact of industry changes in temperature. In general, a decrease of 30 percent to 50 percent of the light output power of constant equivalent einen preliminary notes from the end of life power LEDs. Power-LED lifetime was extrapolated to more than 50,000 hours.

The LED’s color, or wavelength, will change with temperature. As the die temperature increases, the wavelength of the color increases. This is particularly important with white light. The human eye can differentiate small color changes in white light. When Power LEDs are populated in an array, consistent thermal resistance from one die to the next assures consistent color. Because of the comparatively low thermal resistance Thermal Clad offers versus FR-4, die temperature is less affected by slight variances in the junction-to-case thermal resistance that occurs with eutectic or epoxy-die mounting techniques. It is also possible to pack the die more closely in an assembly that utilizes good thermal management techniques, thereby reducing the effects of temperature. Generally, a 30-50 percent drop in light output for a constant-forward current indicates end-of-life for Power LEDs. Power LED lifetimes have been extrapolated to over 50,000 hours.

Light output of the same LED die on different circuit board materials at a mantained die temperature of 80°C.
FR-4 110 Lumens	Thermal Clad MP 580 Lumens
Thermal Clad HT 620 Lumens	Thermal Clad HPL 630 Lumens

Thermal output of the same LED die on different circuit board materials with current maintained at manufacturer’s recommended amperage and voltage

Cost of Heat Summary

Better thermal management allows more forward current to be applied to the LED, which means more light and possibly reducing the number of LEDs required for the desired light output. Maintaining a cooler assembly at an equivalent power equates to more light per die.