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BUS98A Datasheet(PDF) 5 Page - Motorola, Inc |
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BUS98A Datasheet(HTML) 5 Page - Motorola, Inc |
5 / 8 page BUS98 BUS98A 5 Motorola Bipolar Power Transistor Device Data SWITCHING TIMES NOTE In resistive switching circuits, rise, fall, and storage times have been defined and apply to both current and voltage wa- veforms since they are in phase. However, for inductive loads which are common to SWITCHMODE power supplies and hammer drivers, current and voltage waveforms are not in phase. Therefore, separate measurements must be made on each waveform to determine the total switching time. For this reason, the following new terms have been defined. tsv = Voltage Storage Time, 90% IB1 to 10% Vclamp trv = Voltage Rise Time, 10–90% Vclamp tfi = Current Fall Time, 90–10% IC tti = Current Tail, 10–2% IC tc = Crossover Time, 10% Vclamp to 10% IC An enlarged portion of the inductive switching waveforms is shown in Figure 7 to aid in the visual identity of these terms. For the designer, there is minimal switching loss during storage time and the predominant switching power losses occur during the crossover interval and can be obtained us- ing the standard equation from AN–222: PSWT = 1/2 VCCIC(tc) f In general, trv + tfi ] tc. However, at lower test currents this relationship may not be valid. As is common with most switching transistors, resistive switching is specified at 25 _C and has become a benchmark for designers. However, for designers of high frequency con- verter circuits, the user oriented specifications which make this a “SWITCHMODE” transistor are the inductive switching speeds (tc and tsv) which are guaranteed at 100_C. INDUCTIVE SWITCHING 4 Figure 9. Storage Time, tsv IC, COLLECTOR CURRENT (AMPS) 2 4 6 8 10 20 30 2 1 0.7 Figure 10. Crossover and Fall Times Ib2/Ib1 2 Figure 11a. Turn–Off Times versus Forced Gain βf, FORCED GAIN 4 6 8 0.5 0.2 0.03 0.8 Figure 11b. Turn–Off TM Times versus Ib2/Ib1 IC, COLLECTOR CURRENT (AMPS) 0.6 0.4 0.2 0.1 3 3 0.5 βf = 5 TC = 100°C TC = 25°C 2 4 6 8 10 20 30 βf = 5 tc tfi TC = 100°C TC = 25°C 2 1 0.3 0.1 0.05 10 tsv tc tfi TC = 25°C IC = 20 A VBE(off) = 5 V 1 2 3 4 0.5 0.2 0.03 3 2 1 0.3 0.1 0.05 5 TC = 25°C IC = 20 A βf = 5 TC = 25°C TC = 100°C tsv tc tfi |
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