BFQ790 Datasheet, PDF (10/30 Pages) Infineon Technologies AG – High Linearity High Gain 1/2 Watt RF Driver Amplifier

BFQ790
Recommended Operating Conditions
4
Recommended Operating Conditions
This following table shows examples of recommended operating conditions. As long as maximum ratings are
regarded operation outside these conditions is permitted, but increases failure rate and reduces lifetime. For
further information refer to the quality report available on the BFQ790 internet page.
Table 4-1 Recommended Operating Conditions
Operating
Mode
Ambient Collector DC
RF Output Efficiency Dissipated Thermal Junction
Tempera- Current Power²⁾ Power ^{3) 4)}
Power⁵⁾ Resistance Tempera-
ture¹⁾
of pcb⁶⁾
ture⁷⁾
T_A
I_C
P_DC
P_RFout
η
[°C]
[mA]
[mW] [mW] (dBm) [%]
P_diss
R_THSA
T_J
[mW]
[K/W]
[°C]
Compression 55
250
1250 500 (27) 40
750
35
110
Final stage 55
200
1000 250 (24) 25
750
35
110
High T_A
85
120
600
50 (17)
8.5
550
10
110
Maximum T_A 105
50
250
100 (20) 40
150
10
110
Linear
55
150
750
50 (17)
7
700
35
110
Very Linear 55
250
1250 50 (17)
4
1200
10
110
1) Is the operating case temperature respectively of the heat sink.
2) P_DC = V_CE * I_C with V_CE = 5V.
3) RF power delivered to the load, P_RFout = η * P_DC.
4) Efficiency of the conversion from DC power to RF power, η = P_RFout / P_DC (collector efficiency).
5) P_diss = P_DC - P_RFout. The RF output power P_RFout delivered to the load reduces the power P_diss to be dissipated by the
device. This means a good output match is recommended.
6) R_THSA is the thermal resistance of the pcb including heat sink, that is between the soldering point S and the ambient A.
Regard the impact of R_THSA on the junction temperature T_J, see below. The thermal design of the pcb, respectively R_THSA,
has to be adjusted to the intended operating mode.
7) T_J = T_A + P_diss * R_THJA. R_THJA = R_THJS + R_THSA.
R_THJA is the thermal resistance between the transistor junction J and the ambient A.
R_THJS is the combined thermal resistance of die and package, which is 35 K/W for the BFQ790, see chapter 5.
Preliminary Data Sheet
10
Revision 2.0, 2014-08-26