BFP780_15 Datasheet, PDF (10/28 Pages) Infineon Technologies AG – 200 mW High Gain RF Driver Amplifier

BFP780
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 BFP780 internet page.
Table 4-1 Recommended Operating Conditions
Operating
Mode
Ambient Collector DC
RF Output Efficiency Dissipated Thermal Junction
Tempera- Current Power²⁾ Power³⁾
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
90
450
200 (23) 45
250
120
110
Final stage 55
90
450
115 (20.5) 25
340
70
110
High T_A
85
50
250
75 (19)
30
175
35
110
Maximum T_A 105
20
100
45 (16.5) 45
55
35
110
Linear
55
50
250
20 (13)
8
230
120
110
Very Linear 55
90
450
23 (13.5) 5
430
35
110
1) Is the operating case temperature respectively of the heatsink.
2) P_DC = V_CE* I_C with V_CE = 5 V.
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 95 K/W for the BFP780, see Chapter 5.
Data Sheet
10
Revision 3.0, 2015-07-08