ARF521

Figure 5, Typical Threshold Voltage vs Temperature

1.10

1.05

1.00

0.95

0.90

-50 -25

0

25

50

75

100 125 150

Figure 6, Typical Output Characteristics

0

5

10

15

20

25

30

9V

7V

8V

12V

10V

11V

30

25

20

15

10

5

0

Figure 7b,TRANSIENT THERMAL IMPEDANCE MODEL

Note:

Duty Factor D = t1/t2

Peak TJ = PDM x ZθJC + TC

t1

t2

SINGLE PULSE

1.0

RECTANGULARPULSEDURATION(SECONDS)

FIGURE7a,MAXIMUMEFFECTIVETRANSIENTTHERMALIMPEDANCE,JUNCTION-TO-CASEvsPULSEDURATION

0.70

0.60

0.50

0.40

0.30

0.20

0.10

0

0.5

0.1

0.3

0.7

0.05

D = 0.9

0.256

0.213

0.131

0.00496F

0.0590F

0.635F

Transient Thermal Impedance RC Model

Dissipated Power

(Watts)

T

T

Z

impedances: Case to sink, sink to

ambient, etc. Set to zero when modeling

only the case to junction.

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

Freq. (MHz)

Zin (Ω)

2.0

13.5

27

40

65

80

100

24 - j 4.5

8.3 - j 11.6

2.5 - j 7.1

1.0 - j 4.2

.30 - j 1.1

.25 + j 0.3

.35 + j 1.6

55 - j 4

45 - j 22

28.7 - j 28

17.9 - j 26

9.0 - j 20.6

5.8 - j 17

4 - j 14.2

Zin - Gate shunted with 25Ω