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BCW30LT1D Datasheet(PDF) 6 Page - ON Semiconductor |
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BCW30LT1D Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 7 page BCW30LT1G http://onsemi.com 6 Figure 17. Thermal Response t, TIME (ms) 1.0 0.01 0.01 0.02 0.03 0.05 0.07 0.1 0.2 0.3 0.5 0.7 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10 20 50 100 200 500 1.0k 2.0k 5.0k 10k 20k 50k 100k D = 0.5 0.2 0.1 0.05 0.02 0.01 SINGLE PULSE DUTY CYCLE, D = t1/t2 D CURVES APPLY FOR POWER PULSE TRAIN SHOWN READ TIME AT t1 (SEE AN-569) ZqJA(t) = r(t) • RqJA TJ(pk) - TA = P(pk) ZqJA(t) t1 t2 P(pk) FIGURE 19 TJ, JUNCTION TEMPERATURE (°C) 104 -4 0 Figure 18. Typical Collector Leakage Current DESIGN NOTE: USE OF THERMAL RESPONSE DATA A train of periodical power pulses can be represented by the model as shown in Figure 19. Using the model and the device thermal response the normalized effective transient thermal resistance of Figure 17 was calculated for various duty cycles. To find ZqJA(t), multiply the value obtained from Figure 17 by the steady state value RqJA. Example: The BCW29LT1 is dissipating 2.0 watts peak under the following conditions: t1 = 1.0 ms, t2 = 5.0 ms (D = 0.2) Using Figure 17 at a pulse width of 1.0 ms and D = 0.2, the reading of r(t) is 0.22. The peak rise in junction temperature is therefore DT = r(t) x P(pk) x RqJA = 0.22 x 2.0 x 200 = 88°C. For more information, see AN−569. 10-2 10-1 100 101 102 103 -2 0 0 + 20 + 40 + 60 + 80 + 100 + 120 + 140 + 160 VCC = 30 V ICEO ICBO AND ICEX @ VBE(off) = 3.0 V |
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