ICE2QS03G_16 Datasheet, PDF (6/28 Pages) Infineon Technologies AG – 45 W adapter demo board

45 W adapter demo board
Using the new 800 V CoolMOS™ P7 and ICE2QS03G quasi-resonant PWM controller
800 V CoolMOS™ P7 overview
Using the P7 PSpice models for the 45 W adapter, we can look at the losses occurring in the MOSFET of the 45 W
adapter flyback converter. The figure below shows the breakdown of the MOSFET turn on losses, turn off
losses, and conduction losses. As shown in Figure 6, the switching losses of the MOSFET are a more significant
loss contributor at high line. The figure below shows the breakdown of MOSFET turn on losses, turn off losses,
and conduction losses at high line. At low line the conduction losses (RDS(ON)) dominate and the improvement in
COSS does not make such a large improvement. The IPA80R1K4P7 MOSFET offers lower switching losses which
give a total power savings of 15.6 mW at high line over the original C3 series SPA06N80C3 - with a large
reduction in cost.
160
140
120
100
80
60
Gate
40
Turn-Off
20
Conduction
Turn-On
0
SPA11N80C3 High line
IPA80R1K4P7 High line
MOSFET and Line Voltage
Figure 6 Switching losses of SPA11N80C3 vs. IPA80R450P7 at 230 VAC input
0,1
0,0
5
-0,1
10
15
20
25
30
35
40
45
-0,2
-0,3
SPA11N80C3
-0,4
Comp. 1
Comp. 2
-0,5
IPA80R450P7
-0,6
-0,7
-0,8
-0,9
Pout [W]
Figure 7 IPA80R450P7 set as the efficiency reference measured in the 45 W adapter in comparison with the
SPA11N80C3 and a competitor’s equivalent component at 230 V_AC.
Application Note
6
Revision 1.0
2016-06-27