Meaning of Absolute Maximum Rating

Never exceed the absolute maximum rating specified in the datasheets and catalogs, even for an instant. In particular, the following points should be noted:

1. When operating the LED, the LED elements may be damaged by the spike current generated when the power switch is turned on and off or when the output is adjusted. Before use, be sure to check the transient characteristics of the power supply and make sure that the spike current does not exceed the absolute maximum rating of the forward current.

2. If the LED element is driven beyond the absolute maximum rating of the forward current, the reliability of the LED element will degrade significantly. Also, when driving the LED in pulses, make sure that the pulse current does not exceed the maximum permissible pulse current value specified in the data sheet “Forward Current – Pulse Duration”.

3. The absolute maximum ratings are specified at a case temperature (at the solder point) of 25°C. Therefore, the higher the temperature, the higher the maximum rating. Therefore, as the temperature increases, the maximum forward current and allowable loss decreases and the operating range is limited, so design with as much leeway as possible.

4. There is a relationship between junction temperature (Tj) and thermal resistance (Rthjs), and care should be taken to ensure that the junction temperature does not exceed the absolute maximum rating as follows:

   Tj = Rthjs x Pd + Ts

   Each indicator has the following meanings

   Tj: Junction temperature
   Rthjs: Thermal Resistance
   Ts: Temperature of solder point

   See also.

   Pd = VfxIf
   Vf: Forward voltage
   If: Forward current
   Po: Radiant Energy

5. Never apply a reverse voltage above the absolute maximum rating.