BUH150G Datasheet, PDF (9/10 Pages) ON Semiconductor – SWITCHMODE NPN Silicon Planar Power Transistor

BUH150G
TYPICAL THERMAL RESPONSE
1
SECOND BREAKDOWN
0.8
DERATING
0.6
THERMAL DERATING
0.4
0.2
0
20 40
60
80 100 120 140 160
T_C, CASE TEMPERATURE (°C)
Figure 21. Forward Bias Power Derating
There are two limitations on the power handling ability of
a transistor: average junction temperature and second
breakdown. Safe operating area curves indicate I_C−V_CE
limits of the transistor that must be observed for reliable
operation; i.e., the transistor must not be subjected to greater
dissipation than the curves indicate. The data of Figure 22 is
based on T_C = 25°C; T_J(pk) is variable depending on power
level. Second breakdown pulse limits are valid for duty cycles
to 10% but must be derated when T_C > 25°C. Second
breakdown limitations do not derate the same as thermal
limitations. Allowable current at the voltages shown on
Figure 22 may be found at any case temperature by using the
appropriate curve on Figure 21.
T_J(pk) may be calculated from the data in Figure 24. At any
case temperatures, thermal limitations will reduce the power
that can be handled to values less than the limitations imposed
by second breakdown. For inductive loads, high voltage and
current must be sustained simultaneously during turn−off
with the base to emitter junction reverse biased. The safe level
is specified as a reverse biased safe operating area
(Figure 23). This rating is verified under clamped conditions
so that the device is never subjected to an avalanche mode.
100
1 ms
10
10 ms
5 ms
1 ms
DC
1
0.1
0.01
1
10
100
1000
V_CE, COLLECTOR-EMITTER VOLTAGE (VOLTS)
Figure 22. Forward Bias Safe Operating Area
16
14
GAIN ≥ 5
T_C ≤ 125°C
L_C = 4 mH
12
10
8
6
-5 V
4
0V
-1.5 V
2
0
300
400
500
600
700
800
V_CE, COLLECTOR-EMITTER VOLTAGE (VOLTS)
Figure 23. Reverse Bias Safe Operating Area
1
0.5
0.2
0.1
0.1
0.05
0.02
0.01
0.01
SINGLE PULSE
P_(pk)
t₁
t₂
DUTY CYCLE, D = t₁/t₂
R_qJC(t) = r(t) R_qJC
R_qJC = 0.83°C/W MAX
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
READ TIME AT t₁
T_J(pk) - T_C = P_(pk) R_qJC(t)
0.1
1
10
100
1000
t, TIME (ms)
Figure 24. Typical Thermal Response (Z_qJC(t)) for BUH150
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