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www.advateklights.com PixLite A4-S Mk3 User Manual V211013
9 - Specifications
9.1 - Derating
The maximum output current that the PixLite A4-S Mk3 can provide to pixels is 28A,
which it can do over a wide temperature range. To prevent this high current from
causing excessive heat during operation, the PixLite A4-S Mk3 has been equipped
with a heat sink on the underside of the unit.
As the ambient temperature increases, the maximum output current the device is
rated to handle will become limited, known as derating. Derating is simply a reduction
in the rated specification of the controller as the temperature changes. As shown by
the graph in Figure 14 below, the current maximum output capacity is only impacted
when the ambient temperature reaches 60°C. At 60°C, the maximum output capacity
drops linearly until the ambient temperature reaches 70°C, at which point the device
is not specified for operation.
Installations in hot environments (typically enclosed areas with power supplies)
should take note of this derating behavior. A fan blowing air over the device’s heatsink
will improve its thermal performance. The amount to which this will improve thermal
performance will depend on the specific installation.
Figure 14: Derating Curve
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