System board

Heatsink

Air flow

direction

Application notes continued

3

For optimal thermal performance conforming to derating curve, the

module should be installed vertically.

75W

70W

60W

50W

40W

30W

20W

10W

0W

0°C10°C20°C30°C40°C50°C60°C70°C80°C90°C0°C10°C20°C30°C40°C50°C60°C70°C80°C90°C0°C10°C20°C30°C40°C50°C60°C70°C80°C90°C

0°C10°C20°C30°C40°C50°C60°C70°C80°C90°C0°C10°C20°C30°C40°C50°C60°C70°C80°C90°C0°C10°C20°C30°C40°C50°C60°C70°C80°C90°C

RESISTIVE LOADING

(power factor = 1.0)

FAN COOLING WITH

BUILT-IN HEATSINK

AMBIENT TEMPERATURE (

°C)

80

°C

ab

c

d

75W

70W

60W

50W

40W

30W

20W

10W

0W

RESISTIVE LOADING

(power factor = 1.0)

FREE AIR

CONVECTION

AMBIENT TEMPERATURE (

°C)

75

°C

ab

c

75VA

70VA

60VA

50VA

40VA

30VA

20VA

10VA

0VA

CAPACITIVE LOADING

(power factor = 0.8)

AMBIENT TEMPERATURE (

°C)

80

°C

ab

c

d

75VA

70VA

60VA

50VA

40VA

30VA

20VA

10VA

0VA

CAPACITIVE LOADING

(power factor = 0.5)

AMBIENT TEMPERATURE (

°C)

80

°C

ab

c

d

75VA

70VA

60VA

50VA

40VA

30VA

20VA

10VA

0VA

CAPACITIVE LOADING

(power factor = 0.8)

FREE AIR

CONVECTION

AMBIENT TEMPERATURE (

°C)

75

°C

ab

c

75VA

70VA

60VA

50VA

40VA

30VA

20VA

10VA

0VA

CAPACITIVE LOADING

(power factor = 0.5)

AMBIENT TEMPERATURE (

°C)

75

°C

ab

c

d

d

d

FREE AIR

CONVECTION

FAN COOLING WITH

BUILT-IN HEATSINK

FAN COOLING WITH

BUILT-IN HEATSINK

Fan cooling with built-in heatsink:

a =

Free air convection

b =

75 LFPM

c =

225 LFPM

d =

500 LFPM

Free air convection

a =

Built-in heatsink

b =

Heatsink of 1°C/W

c =

Heatsink of 0.5°C/W

d =

No heatsink

75VA

DC/AC ring generator

TELEPHONE RING GENERATORS

|

75VA DC/AC

PAGE 179

http://www.artesyn.com

Data Sheet © Artesyn Technologies® 2000

The information and specifications contained in this data sheet are believed to be correct at time of publication. However, Artesyn Technologies accepts no responsibility for consequences arising

from printing errors or inaccuracies. Specifications are subject to change without notice. No rights under any patent accompany the sale of any such product(s) or information contained herein.

6