MRF157 datasheet(4/7 Pages) MACOM

4 / 7 page

100

Pin, POWER INPUT (WATTS)

VDD = 60 V

IDQ = 2 x 800 mA

f = 30 MHz

t1 = 1 ms (See Fig. 9)

t2 = 10 ms (See Fig. 9)

Figure 8. Output Power versus Input Power

Under Pulse Conditions (2 x MRF157)

Figure 9. Thermal Response versus

Pulse Width

Figure 10. Series Equivalent Impedance

0.01

0.02

0.05

0.1

0.2

0.5

10-2

10-1

110

102

103

104

PULSE WIDTH, t (ms)

D = 0.5

0.2

0.1

0.05

0.02

SINGLE PULSE

RθJC(t) = r(t) RθJC

RθJC = 0.13°C/W MAX

D CURVES APPLY FOR POWER

PULSE TRAIN SHOWN

READ TIME AT t1

TJ(pk) - TC = P(pk) RθJC(t)

P(pk)

DUTY CYCLE, D = t1/t2

Note: Pulse data for this graph was taken in a push–pull circuit similar

Note: to the one shown. However, the output matching network was

Note: modified for the higher level of peak power.

Note: To determine ZOL*, use formula

= ZOL*

(VCC – Vsat)2

2Po

f = 100 MHz

2.0

4.0

7.5

VDD = 50 V

IDQ = 800 mA

Pout = 600 W

Zo = 10 Ω

Zin

REV 1

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