FE150H datasheet(2/8 Pages) MACOM

2 / 8 page

Tyco Electronics Corp.

Technical Note

August 1997

High-Power Board-Mounted Power Modules

Thermal Mangement for

Basic Thermal Management (continued)

However, efﬁciency is a nonlinear function of the mod-

ule input voltage (VI) and output current (IO). Typically, a

plot of power dissipation versus output current over

three different line voltages is given in each module-

speciﬁc data sheet. This is because each power mod-

ule output voltage has a different power dissipation

curve. The typical curves of PD vs. IO for three input

voltages for the FE150A Power Module are shown in

Figure 2.

8-583(C)

Figure 2. FE150A Power Dissipation as Heat vs.

Output Load

Module Derating

200 Watt Power Modules

Please see module speciﬁc data sheets for the FE200

and FW200 Series BMPMs. These modules have an

85 °C maximum case temperature.

Forced Convection Without Heat Sinks

Increasing the airﬂow over the module improves cool-

ing. Figure 3 shows power derating vs. local ambient

temperature (TA) at airﬂows from natural convection to

4.0 m/s (800 ft./min.)

8-587(C)

Figure 3. Forced Convection Derating Without Heat

Sinks

The curves in Figure 3 were obtained from measure-

ments made in a free stream of air approaching a verti-

cally oriented module mounted on a printed-wiring board

(PWB) in a rectangular passage, as shown in Figure 4.

8-690(C)

Figure 4. Location for Measurements

Figure 3 can be used to determine the appropriate

airﬂow for a given set of operating conditions. For

example, at PD = 20 W and TA = 40 °C, an airﬂow of

1.0 m/s (200 ft./min.) is sufﬁcient to keep the module

within its ratings.

Heat Sinks

Several standard heat sinks are available for high-

power BMPMs, as shown in Figures 5 and 6 with their

respective thermal resistances for natural convection.

The heat sinks mount to the top surface of the module

using #4-40 hardware torqued to 0.56 N-m (5 in.-lb.)

Placing a thermally conductive dry pad or thermal

grease between the case and the heat sink minimizes

contact resistance and temperature drop.

OUTPUT CURRENT, IO (A)

VI = 60 V

VI = 50 V

VI = 40 V

LOCAL AMBIENT TEMPERATURE, TA (

°C)

020

100

0.1 m/s (20 ft./min.)

NATURAL CONVECTION

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.)

2.5 m/s (500 ft./min.)

3.0 m/s (600 ft./min.)

3.5 m/s (700 ft./min.)

4.0 m/s (800 ft./min.)

FACING

PWB

AIR VELOCITY

AND AMBIENT

TEMPERATURE

MEASURED

BELOW THE

MODULE

AIRFLOW

PWB

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