LC010CL datasheet(17/24 Pages) GE

17 / 24 page

Lineage Power

Data Sheet

March 27, 2008

18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 10 W and 15 W

LC/LW010- and LC/LW015-Series Power Modules:

Thermal Considerations

The power module operates in a variety of thermal

environments; however, sufficient cooling should be

provided to help ensure reliable operation of the unit.

Heat-dissipating components inside the unit are ther-

mally coupled to the case. Heat is removed by conduc-

tion, convection, and radiation to the surrounding

environment. Proper cooling can be verified by mea-

suring the case temperature. The case temperature

(TC) should be measured at the position indicated in

Figures 41 and 42.

8-1363(C).b

Note: Dimensions are in millimeters and (inches). Pin locations are

for reference only.

Figure 41. LW010 and LC010 Case Temperature

Measurement Location

8-1363(C).c

Note: Dimensions are in millimeters and (inches). Pin locations are

for reference only.

Figure 42. LW015 and LC015 Case Temperature

Measurement Location

Note that the views in Figures 41 and 42 are of the sur-

face of the modules. The temperatures at these loca-

tions should not exceed the maximum case

temperature indicated on the derating curve. The out-

put power of the module should not exceed the rated

power for the module as listed in the Ordering Informa-

tion table.

Heat Transfer Characteristics

Increasing airflow over the module enhances the heat

transfer via convection. Figures 43 through 45 show

the maximum power that can be dissipated by the mod-

ule without exceeding the maximum case temperature

versus local ambient temperature (TA) for natural con-

vection through 3.0 ms–1 (600 ft./min.).

Systems in which these power modules are used typi-

cally generate natural convection airflow rates of

0.25 ms–1 (50 ft./min.) due to other heat dissipating

components in the system. Therefore, the natural con-

vection condition represents airflow rates of approxi-

mately 0.25 ms–1 (50 ft./min.). Use of Figure 43 is

shown in the following example.

Example

What is the minimum airflow necessary for an LW010A

operating at 48 V, an output current of 2.0 A, and a

maximum ambient temperature of 91 °C?

Solution:

Given: VI = 48 V, IO = 2.0 A (IO, max), TA = 91 °C

Determine PD (Figure 58): PD = 2.5 W

Determine airflow (Figure 43): v = 2.0 ms–1

(400 ft./min.)

8-1375(C).a

Figure 43. LW010/LC010 Forced Convection Power

Derating; Either Orientation

dc-dc POWER MODULE

15.2

(0.6)

OUT

LW010/LC010

10.2

(0.4)

dc-dc POWER MODULE

5.1

(0.2)

OUT

LW015/LC015

5.1 (0.2)

100

110

40 45

105

3.5

1.5

0.5

2.5

MAX AMBIENT TEMPERATURE, TA (˚C)

MAXIMUM CASE TEMPERATURE

2.0 ms-1 (400 ft./min.)

3.0 ms-1 (600 ft./min.)

1.0 ms-1 (200 ft./min.)

NATURAL CONVECTION

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