AN1506 - APPLICATION NOTE

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ripple is increased but is still tolerable. In figure 12 the whole results of the two test conditions with

different switching frequencies are given; the traces are relative to the total power losses and the

conduction ones.

TABLE 2. THERMAL BEHAVIOR OF THE POWER MOSFET AT DIFFERENT LOAD CONDITIONS:

HYSTERESIS BAND 4%

Figure 11. Experimental traces of the phase currents. The switching frequency of the inverter is

t=50ms/div)

I

[A]

[C]

[W]

[W]

[W]

[m

Ω]

5.74

50.2

1.68

0.06

1.62

6.90

9.08

60.8

2.39

0.15

2.24

7.22

10.30

64.3

2.62

0.19

2.43

7.32

13.13

71.3

3.08

0.32

2.76

7.53

15.00

76.0

3.40

0.43

2.97

7.68

19.70

95.0

4.67

0.80

3.87

8.25