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BCW61DLT1 Datasheet(PDF) 6 Page - Leshan Radio Company |
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BCW61DLT1 Datasheet(HTML) 6 Page - Leshan Radio Company |
6 / 6 page LESHAN RADIO COMPANY, LTD. M10–6/6 T J , JUNCTION TEMPERATURE (°C) Figure 15. 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 15. Using the model and the device thermal response the normalized effective transient thermal re- sistance of Figure 14 was calculated for various duty cycles. To find Z θ JA(t) , multiply the value obtained from Figure 14 by the steady state value R θ JA . Example: The MPS3905 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 14 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 R θJA = 0.22 x 2.0 x 200 = 88°C. For more information, see AN–569. BCW61BLT1 BCW61CLT1 BCW61DLT1 |
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