NH033 datasheet(14/20 Pages) LINEAGEPOWER

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NH033x-L and NH050x-L Series Power Modules:

Data Sheet

5 Vdc Input; 1.2 Vdc to 3.3 Vdc Output; 10 A and 15 A

March 2010

Lineage Power

Feature Descriptions (continued)

Overtemperature Protection

To provide additional protection in a fault condition, the

unit is equipped with a nonlatched thermal shutdown

circuit. The shutdown circuit engages when Q32

exceeds approximately 120 °C. The unit attempts to

restart when Q32 cools down. The unit cycles on and

off if the fault condition continues to exist. Recovery

from shutdown is accomplished when the cause of the

overheating condition is removed.

Thermal Considerations

The power modules operate in a variety of thermal

environments; however, sufficient cooling should be

provided to help ensure reliable operation of the unit.

Heat is removed by conduction, convection, and radia-

tion to the surrounding environment.

The thermal data presented is based on measure-

ments taken in a wind tunnel. The test setup shown in

Figure 40 was used to collect data for Figures 50 and

51. Note that the airflow is parallel to the long axis of

the module. The derating data applies to airflow along

either direction of the module’s long axis.

The module runs cooler when it is rotated 90° from the

direction shown in Figure 40. This thermally preferred

orientation increases the maximum ambient tempera-

tures 4 °C to 5 °C from the maximum values shown in

Figures 50 and 51.

8-1199(C).a

Note: Dimensions are in millimeters and (inches).

Figure 40. Thermal Test Setup

Proper cooling can be verified by measuring the power

module’s temperature at lead 7 of Q32 as shown in

Figure 41.

8-1149(C).b

Figure 41. Temperature Measurement Location

The temperature at this location should not exceed

115 °C at full power. The output power of the module

should not exceed the rated power.

Convection Requirements for Cooling

To predict the approximate cooling needed for the mod-

ule, determine the power dissipated as heat by the unit

for the particular application. Figures 42 through 49

show typical power dissipation for the module over a

range of output currents.

8-2446(C)

Figure 42. NH033M-L Typical Power Dissipation vs.

Output Current, TA = 25 °C

AIRFLOW

203.2 (8.0)

76.2 (3.0)

AIR VELOCITY

AND AMBIENT

TEMPERATURE

MEASURED HERE

POWER MODULE

25.4 (1.0)

LEAD #7

Q32

0.5

3.0

OUTPUT

CURRENT, IO (A)

2.0

1.5

2.5

3.5

1.0

VI= 5.5 V

VI= 5.0 V

VI = 4.5 V

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