RF power amplifier using 2 x SD2943
N-channel enhancement-mode lateral MOSFETs
Features
■ Excellent thermal stability
■ Frequency: 1.8 - 54 MHz
■ Supply voltage: 48 V
■ Output power: 450 W typ.
■ Input power 10 W max.
■ Efficiency: 55 % - 76 %
■ IMD at 300 WPEP < -24 dBc
■ Load mismatch: 3:1 all phases
Description
The STEVAL-TDR005V1 is a RF broadband
power amplifier intended for linear or nonlinear
operation over the band 1.8 to 54 MHz using
2x SD2943 gold metallized N-channel MOS fieldeffect transistors. The temperature compensating
biasing circuit supports class B and class AB
operation.
STEVAL-TDR005V1
Table 1. Device summary
Order code
STEVAL-TDR005V1
STEVAL-TDR005V1 is designed in cooperation
with Specific RF Devices (Germany).
March 2010 Doc ID 14845 Rev 2 1/11
www.st.com
11
Contents STEVAL-TDR005V1
Contents
1 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Photos of STEVAL-TDR005V1 amplifier . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 STEVAL-TDR005V1 class of operation . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 SD2943 mounting recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.1 Mounting recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.2 Mounting sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2/11 Doc ID 14845 Rev 2
STEVAL-TDR005V1 Electrical data
1 Electrical data
1.1 Maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
P
IN
P
OUT
(1)
V
DD
V
GG
I
DD
P
DISS
1. VGG from 9 to 15 V and PIN < 16 W
Input power 16 W
Output power 500 W
Drain supply voltage 50 V
Gate biasing voltage 15 V
Drain current 20 A
Power dissipation 400 W
Doc ID 14845 Rev 2 3/11
Electrical characteristics STEVAL-TDR005V1
2 Electrical characteristics
TA = +25 oC, VDD = 48 V, I
= 2 x 900 mA
DQ
Table 3. Electrical specification
Symbol Test Conditions Min Typ Max Unit
Freq. Frequency range 1.8 54 MHz
P
OUT
Gain P
ND P
H2 2
H3 3
VSWR Load mismatch all phases @ P
PIN = 10 W 350 450 W
= 10 W 16.6 ± 0.6 dB dB
IN
= 10 W 55 - 76 %
IN
ND
Harmonic @ P
RD
Harmonic @ P
= 300 W -24 / -49 dBc
OUT
= 300 W -15 / -58 dBc
OUT
= 300 W 3:1
OUT
4/11 Doc ID 14845 Rev 2
STEVAL-TDR005V1 Typical performance
3 Typical performance
Figure 1. Output power vs frequency Figure 2. Output power vs frequency
Doc ID 14845 Rev 2 5/11
Photos of STEVAL-TDR005V1 amplifier STEVAL-TDR005V1
4 Photos of STEVAL-TDR005V1 amplifier
Figure 3. Top view
Figure 4. Side view
6/11 Doc ID 14845 Rev 2
STEVAL-TDR005V1 STEVAL-TDR005V1 class of operation
5 STEVAL-TDR005V1 class of operation
● Class B: a low bias point with ~100 mA per transistor
● Class AB: a higher bias point with ~ 900 mA per transistor
To select a bias point, STEVAL-TDR005V1 has a control port “BIAS”.
● The bias point is 2x 100 mA if “BIAS” is left open and in this case a DC voltage of ~5 V
is present
● The bias point is 2 x 900 mA if “BIAS” is connected to ground.
"PA_ON" control port / ON-OFF bias current
● To switch-on biasing circuit, connect “PA_ON” to ground.
● To switch-off biasing circuit, left open “PA_ON”
Doc ID 14845 Rev 2 7/11
SD2943 mounting recommendations STEVAL-TDR005V1
6 SD2943 mounting recommendations
6.1 Mounting recommendations
● Ensure holes in heatsinks are free from burrs;
● Minimum depth of tapped holes in heatsinks is 6 mm;
● Use 4-40 UNC-2A cheese-head screws with a flat washer to spread the joint pressure;
● The minimum flatness of the mounting area is 0.02 mm;
● Mounting area roughness should be less than 0.5 µm (micro);
● Avoid, as much as possible, use of flux or flux solutions because flux can penetrate
even when hermetically sealed ceramic-capped transistors. Tin and wash the printedcircuit board BEFORE mounting the power transistors, then solder the transistor leads
without using flux;
● Transistor leads may be tinned by dipping them full-length into a solder bath at a
temperature of about 230 °C. No flux should be used during tinning;
● Recommended heatsink compounds: WPSII (silicon free) from austerlitz electronics,
340 from down corning etc.
6.2 Mounting sequence
● Apply a thin layer of evenly distributed heatsink compound to the flange;
● Position the device with flat washers in place;
● Tighten the screws until finger tight (0.05 Nm);
● Further tighten the screws until the specified torque is reached;
● For M174, M177 and M244 type of packages, torque should be minimum 0.6 Nm and
0.75 Nm max.
8/11 Doc ID 14845 Rev 2
STEVAL-TDR005V1 SD2943 mounting recommendations
Table 4. DMOS packages - list of materials
Package
Typ e
M174
M174
(Moly
disk)
M177
M244
Description Flange Leadframe
0.500 DIA
4L NON
HERM
W/FLANGE
0.500 DIA
4L NON
HERM
W/FLANGE
(MOLY
DISK)
0.550 DIA
4L NON
HERM
W/FLANGE
2x
0.400x0.425
WIDE 2L
LAP N/H
FLANGE
Cu
Cu-Mo-
Cu
Cu-Mo-
Cu
(85%) -
Cu
(15%)
W
ALLOY 42
(Fe58 /
Ni42)
ALLOY 42
(Fe58 /
Ni42)
ALLOY 42
(Fe58 /
Ni42)
ALLOY 42
(Fe58 /
Ni42)
Ceramic
insulator
BeO
(99.5%
min)
BeO
(99.5%
min)
BeO
(99.5%
min)
BeO
(99.5%
min)
Plating Torque (Nm)
Leads Flange Min Max
Au (100µ min) over
Ni (100µ min /
350µ max)
Au (100µ min) over
Ni (100µ min /
350µ max)
Au (60µ min) over
Ni (100µ min /
350µ max)
Au (60µ min) over
Ni (100µ min /
350µ max)
Ni(100µ min) + Pd
(10µ min)
Ni(100µ min) + Pd
(10µ min)
Au (100µ min)
over Ni (100µ min
/ 350µ max)
Au (60µ min) over
Ni (100µ min /
350µ max)
0.6 0.75
0.6 0.75
0.6 0.75
0.6 0.75
Doc ID 14845 Rev 2 9/11
Revision history STEVAL-TDR005V1
7 Revision history
Table 5. Document revision history
Date Revision Changes
01-Jul-2008 1 Initial release.
18-Mar-2010 2 Updated description on cover page.
10/11 Doc ID 14845 Rev 2
STEVAL-TDR005V1
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