Data Sheet
March 2010
NH033x-L and NH050x-L Series Power Modules:
5 Vdc Input; 1.2 Vdc to 3.3 Vdc Output; 10 A and 15 A
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.).
Thermal Considerations (continued)
Convection Requirements for Cooling
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.
(continued)
6
TYPICAL 5.5I,V
15 AOUT DISSIPATION
5
4
TYPICAL 5.0I,V
15 AOUT
DISSIPATION
NATURAL
CONVECTION
3
2
1
0
0.5 m/s (100 ft./min.)
1.0 m/s (200 ft./min.)
1.5 m/s (300 ft./min.)
2.0 m/s (400 ft./min.)
3.0 m/s (600 ft./min.)
5
15 25 35 45 55 65 75 85 95 105115
AMBIENT TEMPERATURE, TA (˚C)
8-1426(C).b
Figure 51. NH050x-L Power Derating vs. Local
Ambient Temperature and Air Velocity
Lineage Power
17
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
