.435

.225

0.200

0.400

0.390

1.100

1.340

.005

.210

.107

.060

.065 rad 2 PL

Package Dimensions (inches)

1

3

2

4

5

Pin 1. Drain

2. Drain

3. Gate

4. Gate

5. Source

ARF473

HAZARDOUS MATERIAL

WARNING

The ceramic portion of the

device between leads and

mounting flange is beryllium

oxide. Beryllium oxide dust is

highly toxic when inhaled. Care

must be taken during handling

and mounting to avoid damage

to this area.

These devices

must never be thrown away with

general industrial or domestic

waste.

J1

T1

130V

+

-

L3

DUT

R1

R2

TL3

TL4

TL5

TL6

L1

L2

C1

C2

C3

C4

C5

C10

TL1

TL2

C1 10-80 pF trimmer ARCO 462

C2-4 1000 pF NPO 500V chip

C5-C9 10 nF 500V chip

C10 .47 uF Ceramic 500V

L1 680 nH 12t #24 enam .312" dia

L2 55 nH 3t #18 enam .25" dia

L3 2t #20 on Fair-Rite 2643006302 bead, ~ 2 uH

R1-2 100

Ω 0.5 W

T1 4:1 RF transformer on two beads same as L3.

T2 1:1 coax balun. Fair-Rite 2643665902 bead

on 1.5" RG-303 50

Ω teflon coax.

TL1-2 Printed line L=1.2" w=.23"

TL3-4 Printed line L=.25" w=.23"

TL5-6 Printed line L=0.25" w=.23"

0.23" wide stripline on FR-4 board is ~32

Ω Zo

J2

T2

81.36 MHz Test amplifier Po = 500W @130 V

Peak Output Power vs... Vdd

0

100

200

300

400

500

600

700

800

900

80

100

120

140

160

0

0.2

0.4

0.6

0.8

1

1.2

Drain Supply Voltage Vdd

Duty Cycle

Po Watts

Notes:

The value of L2 must be adjusted as the

supply voltage is changed to maintain

resonance in the output circuit. At 81 MHz its

value changes from approximately 50 nH at

100V to 70 nH at 165V.

The duty cycle past 100V must be reduced to

insure power dissipation is within the limits of

the device. Maximum pulse length should be

100mS or less. See figure 7.

Max

Vg1

Vg2

C6

C7

C8

C9

APT’s products are covered by one or more of U.S.patents 4,895,810 5,045,903 5,089,434 5,182,234 5,019,522

5,262,336 6,503,786 5,256,583 4,748,103 5,283,202 5,231,474 5,434,095 5,528,058 and foreign patents. US and Foreign patents pending. All Rights Reserved.