0

0.05

0.10

0.15

0.20

0.25

0.30

10

1.0

10

-1

Peak T J = P DM x Z θJC + TC

Duty Factor D =

t2

t1

Note:

RECTANGULAR PULSE DURATION (seconds)

Figure 5. Maximum Effective Transient Thermal Impedance Junction-to-Case vs Pulse Duration

44

46

48

50

52

54

56

58

23

24

25

26

27

28

29

17

22

27

32

37

0

10

20

30

40

50

60

70

80

0

100

200

300

400

500

600

17

22

27

32

37

P

Figure 6. P

P

Figure 7. Eff and P

Po W

OutEff

Freq=30MHz

Freq=30MHz

FIGURE 5b, TRANSIENT THERMAL IMPEDANCE MODEL

Table 1 - Typical Class AB Large Signal Input - Output Impedance

Z

I

Z

Freq. (MHz)

Z

in

Z

out

2

21 - j 8.5

14.1 - j 0.6

13.5

4.5 - j 6.5

12.9 - j 4

27.1

2.9 - j 3.1

9.7 - j 6.6

40.7

2.5 - j 2

7.6 - j 7

65

2.4 - j 2.07

4.5 - j 6.6

0.3

D = 0.9

0.7

SINGLE PULSE

0.5

0.1

0.05

Pout

Gain

VRF3933(MP)

0.0202

0.0507

0.1199

0.00647F

0.02043F

0.2421F

7.962F

0.0792