Power Loss Estimations Of Mosfets And Cs Resistor - Infineon D2 PAK User Manual

Full-bridge converter for UPS
2 2
D PAK/ D PAK-7 kit
UG_1801_PL16_1802_225559
1.6

Power loss estimations of MOSFETs and CS resistor

Table 3 shows the average R
is 39.2 A. Therefore, the conduction power loss for each MOSFET can be estimated as 39.2
which is much higher than the switching loss of 15 mW, shown in Figure 11. Based on the total power loss of 13
W, total MOSFET power loss is about 0.55 × 4/13 = 17 percent.
The power loss of the CS resistor can be estimated as 39.2
loss, which explains why it has the highest case temperature.
User Guide
Table 2 Efficiency after 1 hour
No.
1
2
3
4
5
6
7
8
Average
Stdev
at 12 V is 0.72 mΩ. As shown in Figure 14, the RMS current for the transformer
DS(on) GS
Table 3 R
DS(on)
No.
1
2
3
4
5
6
7
Average
Stdev
Efficiency
(percent)
96.6
96.3
96.4
96.5
96.4
96.4
96.3
96.3
96.4
0.1
2
× 1 = 1.5 W. This is about 12 percent of the total power
measurements at 12 V
GS
R (mΩ)
DS(on)
0.73
0.70
0.70
0.69
0.76
0.71
0.71
0.72
0.02
11
2
× 0.72/2 = 0.55 W,
Revision 1.0
2018-03-01