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BU323A 数据表(PDF) 4 Page - Motorola, Inc |
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BU323A 数据表(HTML) 4 Page - Motorola, Inc |
4 / 6 page BU323A 3–234 Motorola Bipolar Power Transistor Device Data Figure 9. Thermal Response t, TIME (ms) 1 0.01 0.01 0.5 0.2 0.1 0.05 0.02 0.05 1 2 5 10 20 50 100 200 2000 500 R θJC(t) = r(t) RθJC R θJC = °C/W MAX D CURVES APPLY FOR POWER PULSE TRAIN SHOWN READ TIME AT t1 TJ(pk) – TC = P(pk) R θJC(t) P(pk) t1 t2 DUTY CYCLE, D = t1/t2 D = 0.5 0.2 0.05 0.01 SINGLE PULSE 0.1 0.7 0.3 0.07 0.03 0.02 0.1 0.5 0.2 1000 0.02 50 5 Figure 10. Forward Bias Safe Operating Area VCE, COLLECTOR–EMITTER VOLTAGE (VOLTS) 20 10 5 1 0.005 30 70 BONDING WIRE LIMIT THERMAL LIMIT (SINGLE PULSE) SECOND BREAKDOWN LIMIT dc 100 µs 0.2 0.01 10 20 5.0 ms 1.0 ms 100 200 300 500 2 0.1 50 TC = 25°C There are two limitations on the power handling ability of a transistor: average junction temperature and second break- down. Safe operating area curves indicate IC – VCE limits of the transistor that must be observed for reliable operation, i.e., the transistor must not be subjected to greater dissipa- tion than the curves indicate. The data of Figure 10 is based on TC = 25_C; TJ(pk) is variable depending on power level. Second breakdown pulse limits are valid for duty cycles to 10% but must be derated when TC ≥ 25_C. Second breakdown limitations do not der- ate the same as thermal limitations. Allowable current at the voltages shown on Figure 10 may be found at any case tem- perature by using the appropriate curve on Figure 11. TJ(pk) may be calculated from the data in Figure 11. At high case temperatures, thermal limitations will reduce the power that can be handled to values less than the limitations im- posed by second breakdown. 100 0 Figure 11. Power Derating TC, CASE TEMPERATURE (°C) 80 0 80 120 40 20 40 160 200 60 THERMAL DERATING SECOND BREAKDOWN DERATING Figure 12. Ignition Test Circuit 0 Vdc t1 50 ms ≈ 1K ≈ 30 B 470 VCC = 16 Vdc 1N4001 BC337 47 VZ C E TUT 2.2 0.22 µF 100 1N4001 <1 11 mH INDUCTIVE LOAD t1 to be selected such that IC reaches 10 Adc before switch–off. NOTE: Figure 12 specifies energy handling capabilities in an automotive ignition circuit. VZ = 400 V (BU323A) at IZ = 20 mA |
类似零件编号 - BU323A |
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类似说明 - BU323A |
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