Shenzhen Hpmont Technology Co., Ltd.
Chapter 1 Safety Information
HD3N-L Series User Manual V1.0
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Altitude and Derating
In area where altitude exceeds 1000 meters, HD3N-L should be derating since the heatsink efficiency
will be reduced because of the tenuous air.
The rated value of output current derates by 1% for each 100m increase of the altitude. I.e. for the
altitude of 4000m, derated rate is 30% for rated current of HD3N-L. Figure 1-1 is the derating curve of
rated current and the altitude.
Figure 1-1 Derating curve of rated current and altitude
70%
100%
1000m
4000m
Altitude
Controller rated current
1
