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BCW29LT1 Datasheet(PDF) 6 Page - Leshan Radio Company |
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BCW29LT1 Datasheet(HTML) 6 Page - Leshan Radio Company |
6 / 6 page LESHAN RADIO COMPANY, LTD. M7–6/6 BCW29LT1 BCW30LT1 t, TIME (ms) Figure 17. Thermal Response D = 0.5 0.02 0.05 0.1 0.2 0.01 SINGLE PULSE DUTY CYCLE, D = t 1 / t 2 D CURVES APPLY FOR POWER PULSE TRAIN SHOWN READ TIME AT t 1 (SEE AN–569) Z θJA(t) = r(t) • RθJA T J(pk) – T A = P (pk) Z θJA(t) FIGURE 19 P (pk) t 2 t 1 1.0 0.7 0.5 0.3 0.2 0.1 0.07 0.05 0.03 0.02 0.01 0.01 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 T J , JUNCTION TEMPERATURE (°C) Figure 18. Typical Collector Leakage Current V CC = 30 V 104 103 102 101 100 10–1 10–2 –4 –2 0 +20 +40 +60 +80 +100 +120 +140 +160 I CBO AND I CEX @ V BE(off) = 3.0 V I CEO 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 re- sistance of Figure 17 was calculated for various duty cycles. To find Z θ JA(t) , multiply the value obtained from Figure 17 by the steady state value R θ JA . Example: The BCW29LT1 is dissipating 2.0 watts peak under the follow- ing conditions: t 1 = 1.0 ms, t 2 = 5.0 ms. (D = 0.2) Using Figure 17at a pulse width of 1.0 ms and D = 0.2, the read- ing of r(t) is 0.22. The peak rise in junction temperature is therefore ∆T = r(t) x P (pk) x R θJA = 0.22 x 2.0 x 200 = 88°C. For more information, see AN–569. |
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