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| MJH11017 |
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MOTOROLA |
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3 page
MJH11017 MJH11019 MJH11021 MJH11018 MJH11020 MJH11022 3 Motorola Bipolar Power Transistor Device Data Figure 3. Thermal Response t, TIME (ms) 1.0 0.01 0.02 0.7 0.2 0.1 0.05 0.02 0.05 1.0 2.0 5.0 10 20 50 100 200 500 R θJC(t) = r(t) RθJC R θJC = 0.83°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 SINGLE PULSE 0.1 0.5 0.2 1000 0.5 0.3 0.07 0.03 0.01 0.03 3.0 30 300 0.3 0.2 0.1 0.05 0.02 0.01 WIRE BOND LIMIT THERMAL LIMIT SECOND BREAKDOWN LIMIT 0.5 ms Figure 4. Maximum Rated Forward Bias Safe Operating Area (FBSOA) 1.0 ms 5.0 ms 0.1 ms dc VCE, COLLECTOR–EMITTER VOLTAGE (VOLTS) 2.0 30 2.0 3.0 10 10 0.5 0.2 5.0 20 1.0 20 100 0 TC = 25°C SINGLE PULSE 5.0 50 250 150 30 MJH11017, MJH11018 MJH11019, MJH11020 MJH11021, MJH11022 FORWARD BIAS 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 4 is based on TJ(pk) = 150_C; TC is variable depending on conditions. Second breakdown pulse limits are valid for duty cycles to 10% provided TJ(pk) v 150 _C. TJ(pk) may be calculated from the data in Figure 3. At high case temperatures, thermal limitations will reduce the power that can be handled to values less than the limitations imposed by second breakdown. VCE, COLLECTOR–EMITTER VOLTAGE (VOLTS) 20 30 140 60 180 100 10 20 260 220 0 Figure 5. Maximum Rated Reverse Bias Safe Operating Area (RBSOA) L = 200 µH IC/IB1 ≥ 50 TC = 100°C VBE(off) = 0 – 5.0 V RBE = 47 Ω DUTY CYCLE = 10% 0 MJH11017, MJH11018 MJH11019, MJH11020 MJH11021, MJH11022 REVERSE BIAS For inductive loads, high voltage and high current must be sustained simultaneously during turn–off, in most cases, with the base to emitter junction reverse biased. Under these conditions the collector voltage must be held to a safe level at or below a specific value of collector current. This can be accomplished by several means such as active clamping, RC snubbing, load line shaping, etc. The safe level for these devices is specified as Reverse Bias Safe Operating Area and represents the voltage–current conditions during re- verse biased turn–off. This rating is verified under clamped conditions so that the device is never subjected to an ava- lanche mode. Figure 5 gives RBSOA characteristics. |
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