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MMBT6521LT1 Folha de dados(PDF) 6 Page - ON Semiconductor |
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MMBT6521LT1 Folha de dados(HTML) 6 Page - ON Semiconductor |
6 / 7 page MMBT6521LT1 http://onsemi.com 6 Figure 20. 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) w RqJA TJ(pk) − TA = P(pk) ZqJA(t) t1 t2 P(pk) FIGURE 21 Figure 21. TJ, JUNCTION TEMPERATURE (°C) 104 −4 0 Figure 22. VCE, COLLECTOR−EMITTER VOLTAGE (VOLTS) 400 2.0 DESIGN NOTE: USE OF THERMAL RESPONSE DATA A train of periodical power pulses can be represented by the model as shown in Figure 21. Using the model and the de- vice thermal response the normalized effective transient ther- mal resistance of Figure 20 was calculated for various duty cycles. To find ZqJA(t), multiply the value obtained from Figure 20 by the steady state value RqJA. Example: The MPS6521 is dissipating 2.0 watts peak under the follow- ing conditions: t1 = 1.0 ms, t2 = 5.0 ms. (D = 0.2) Using Figure 20 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 ON Semiconductor Application Note AN569/D, available from the Literature Distribution Center or on our website at www.onsemi.com. The safe operating area curves indicate IC−VCE 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 22 is based upon TJ(pk) = 150 °C; TC or TA is variable depending upon conditions. Pulse curves are valid for duty cycles to 10% provided TJ(pk) ≤ 150°C. TJ(pk) may be calculated from the data in Figure 20. 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. 10−2 10−1 100 101 102 103 −2 0 0 + 20 + 40 + 60 + 80 + 100 + 120 + 140 + 160 VCC = 30 Vdc ICEO ICBO AND ICEX @ VBE(off) = 3.0 Vdc TA = 25°C CURRENT LIMIT THERMAL LIMIT SECOND BREAKDOWN LIMIT 1.0 ms 10 ms TC = 25°C 1.0 s dc dc 4.0 6.0 10 20 40 60 100 200 4.0 6.0 8.0 10 20 40 TJ = 150°C 100 ms |
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