CoolSET®-F3R
ICE3BR0665JF
Input Power Curve
7
Input Power Curve
Two input power curves giving the typical input power versus ambient temperature are showed below;
Vin=85Vac~265Vac (Figure 68) and Vin=230Vac+/-15% (Figure 69). The curves are derived based on a typical
discontinuous mode flyback model which considers either 50% maximum duty ratio or 100V maximum secondary
to primary reflected voltage (higher priority). The calculation is based on RthSA=2.7K/W as heatsink and
RthCS=1.1K/W as thermal grease thermal resistance. The input power already includes the power loss at input
common mode choke, bridge rectifier and the CoolMOS. The device saturation current (ID_Puls @ Tj=125°C) is also
considered.
To estimate the output power of the device, it is simply multiplying the input power at a particular operating ambient
temperature with the estimated efficiency for the application. For example, a wide range input voltage (Figure 68),
operating temperature is 50°C, estimated efficiency is 80%, then the estimated output power is 138W (173W *
80%).
220
200
180
160
140
120
100
80
60
40
20
0
0
10 20 30 40 50 60 70 80 90 100 110 120 130
Ambient Temperature [°C]
Figure 68
Input power curve Vin=85~265Vac; Pin=f(Ta)
350
315
280
245
210
175
140
105
70
35
0
0
10 20 30 40 50 60 70 80 90 100 110 120 130
Ambient Temperature [°C]
Figure 69
Input power curve Vin=230Vac+/-15%; Pin=f(Ta)
Version 2.0
31
11 Sep 2008
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