GE Industrial Solutions NH050x-L Series - Manual (Page 17)

Data Sheet NH033x-L and NH050x-L Series Power Modules:
March 2010 5 Vdc Input; 1.2 Vdc to 3.3 Vdc Output; 10 A and 15 A
Lineage Power 17
Thermal Considerations
(continued)
Convection Requirements for Cooling
(continued)
8-1426(C).b
Figure 51. NH050x-L Power Derating vs. Local
Ambient Temperature and Air Velocity
For example, if the NH050F-L dissipates 4 W of heat,
the minimum airflow in a 65 °C environment is 1 m/s
(200 ft./min.).
Keep in mind that these derating curves are approxi-
mations of the ambient temperatures and airflows
required to keep the power module temperature below
its maximum rating. Once the module is assembled in
the actual system, the module’s temperature should be
checked as shown in Figure 41 to ensure it does not
exceed 115 °C.
PO
WER DISSIP
A
TION, P
D
(W)
5 15 35 45 115
0
1
5
AMBIENT TEMPERATURE, T A (˚C)
25 55
2
3
4
65 75 85 95 105
6
1.5 m/s (300 ft./min.)
1.0 m/s (200 ft./min.)
0.5 m/s (100 ft./min.)
NATURAL
CONVECTION
2.0 m/s (400 ft./min.)
3.0 m/s (600 ft./min.)
TYPICAL 5.5 V I ,
15 A OUT DISSIPATION
TYPICAL 5.0 V I ,
15 A OUT
DISSIPATION