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BCW73LT1 Folha de dados(PDF) 6 Page - Leshan Radio Company |
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BCW73LT1 Folha de dados(HTML) 6 Page - Leshan Radio Company |
6 / 6 page LESHAN RADIO COMPANY, LTD. M14–6/6 T J , JUNCTION TEMPERATURE (°C) Figure 19A. I CEO 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 Vdc DESIGN NOTE: USE OF THERMAL RESPONSE DATA A train of periodical power pulses can be represented by the model as shown in Figure 19A. Using the model and the device thermal response the normalized effective transient thermal re- sistance of Figure 19 was calculated for various duty cycles. To find Z θ JA(t) , multiply the value obtained from Figure 19 by the steady state value R θ JA . Example: The MPS3904 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 19 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. t, TIME (ms) Figure 19. 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 θ JA(t) = r(t) • R θJA T J(pk) – T A = P (pk) Z θJA(t) FIGURE 19A 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 V CE , COLLECTOR–EMITTER VOLTAGE (VOLTS) Figure 20. CURRENT LIMIT THERMAL LIMIT SECOND BREAKDOWN LIMIT 2.0 4.0 6.0 8.0 10 20 40 The safe operating area curves indicate I C –V CE limits of the transistor that must be observed for reliable operation. Collector load lines for specific circuits must fall below the limits indicated by the applicable curve. The data of Figure 20 is based upon T J(pk) = 150°C; T C or T A is variable depending upon conditions. Pulse curves are valid for duty cycles to 10% provided T J(pk) <150°C. T J(pk) may be calculated from the data in Figure 19. At high case or ambient temperatures, thermal limitations will reduce the power that can be handled to values less than the limitations imposed by second breakdown. T A = 25°C T C = 25°C T J = 150°C 100 µs 1.0 ms 1.0 s 10 µs dc dc 400 200 100 60 40 20 10 6.0 4.0 BCW72LT1 V CC = 30 Vdc |
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