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BCW30LT1 Datasheet(PDF) 6 Page - Motorola, Inc |
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BCW30LT1 Datasheet(HTML) 6 Page - Motorola, Inc |
6 / 8 page BCW29LT1 BCW30LT1 6 Motorola Small–Signal Transistors, FETs and Diodes Device Data 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 1.0 k 2.0 k 5.0 k 10 k 20 k 50 k 100 k 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) Z θJA(t) = r(t) • RθJA TJ(pk) – TA = P(pk) Z θJA(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 Z θJA(t), multiply the value obtained from Figure 17 by the steady state value R θJA. 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 ∆T = r(t) x P(pk) x RθJA = 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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