AIF25R48_03 Datasheet, PDF (25/29 Pages) Astec America, Inc – Isolated DC/DC Converter Module

AIF25R48 Series Technical Reference Note
The module power dissipation then can be calculated through the equation.
Because each power module output voltage has a different power dissipation curve, a plot of
power dissipation versus output current over three different line voltages is given in each
module-specific data sheet. The typical power dissipation curve of AIF25R48 SERIES is
shown as Fig.13.
120
100
80
60
40
20
0
0
5
10
15
20
25
Output Current(A)
Vin=36V
Vin=48V
Vin=75V
Fig.13 Typical Power Dissipation Curve of AIF25R48 series
Module Derating with Heatsink
Usually a customized heatsink is used for AIF25R48 SERIES because the power dissipation
of AIF25R48 series is too large. A heatsink of full brick size can not consume so much heat.
A derating curve is shown in Fig14 with a heatsink of 270mm 220mm 43mm size. The
module will have different derating curves with different heatsink designed by customer.
DATE: May 28, 2003
Fig.14 Temperature Derating Curve with Heatsink
MODEL : AIF25R48 SERIES
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