MJE13007_10 Datasheet, PDF (3/6 Pages) Unisonic Technologies – NPN BIPOLAR POWER TRANSISTOR FOR SWITCHING POWER SUPPLY APPLICATIONS

MJE13007
„ TYPICAL THERMAL RESPONSE
NPN SILICON TRANSISTOR
1
0.7 _D=0.5
0.5
D=0.2
0.2
D=0.1
0.1
0.07 ^D=0.05
0.05 _D=0.02
0.02 _D=0.01
SINGLE PULSE
0.01
0.01 0.02 0.05 0.1 0.2
Figure1. Typical Thermal Response
P(pk)
t1
t2
DUTY CYCLE, D=t1/t2
R_θJC(t)=r(t)R_θJC
R_θJC=1.56°C/W MAX
D CURVES APPLY FOR
POWER
PULSE TRAIN SHOWN
READ TIME AT t₁
TJ_(pk)-T_C=P_(pk)R_θJC (t)
0.5
1
2
5 10 20
50 100 200 500 10k
Time, t (msec)
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 7 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 debated when T_C≥25°C. Second breakdown limitations do
not debate the same as thermal limitations. Allowable current at the voltages shown on Figure 7 may be found at any
case temperature by using the appropriate curve on Figure 9.
At high case temperatures, thermal limitations will reduce the power that can be handled to values less than the
limitations imposed by second breakdown.
Use of reverse biased safe operating area data (Figure 8) is discussed in the applications information section.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 6
QW-R203-019.F