VRF2944 datasheet(3/6 Pages) MICROCHIP

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0.05

0.10

0.15

0.20

0.25

10-5

10-4

10-3

10-2

1.0

-1

VRF2944(MP)

Peak T J = P DM x Z θJC + TC

Duty Factor D =

t1/t2

Note:

t1 = Pulse Duration

RECTANGULAR PULSE DURATION (seconds)

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

100

200

300

400

500

600

700

800

0.5

1.5

2.5

100

200 300

400

500 600 700

IN, INPUT POWER (WATTS PEP)

Figure 6. P

OUT versus PIN

OUT, OUTPUT POWER (WATTS PEP)

Figure 7. EFFICIENCY versus P

50V

40V

Freq=30MHz

0.3

D = 0.9

0.7

SINGLE PULSE

0.5

0.1

0.05

50V

40V

FIGURE 5b, TRANSIENT THERMAL IMPEDANCE MODEL

.0052

Dissipated Power

(Watts)

J ( C)

C ( C)

EXT are the external thermal

impedances: Case to sink,

sink to ambient, etc. Set to

zero when modeling only

the case to junction.

.0408

.0981

.071

.0016

.0030

.0133

.0366

100

200 600 400

500

600

700

OUT, OUTPUT POWER (WATTS PEP)

Figure 7. GAIN versus P

OUT

60V

50V

Freq=30MHz

60V

40V

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