BUS98 Motorola Inc, BUS98 Datasheet - Page 5

• Manufacturer Part Number: BUS98
• Description: 30 AMPERES NPN SILICON POWER TRANSISTORS(SWITCHMODE SERIES)
• Manufacturer: Motorola Inc

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.
An enlarged portion of the inductive switching waveforms is
Motorola Bipolar Power Transistor Device Data
In resistive switching circuits, rise, fall, and storage times
t sv = Voltage Storage Time, 90% I B1 to 10% V clamp
t rv = Voltage Rise Time, 10 – 90% V clamp
t fi = Current Fall Time, 90 – 10% I C
t ti = Current Tail, 10 – 2% I C
t c = Crossover Time, 10% V clamp to 10% I C
0.05
0.03
0.7
0.5
0.5
0.3
0.2
0.1
4
3
2
1
3
2
1
Figure 11a. Turn–Off Times versus Forced Gain
f = 5
2
2
Figure 9. Storage Time, t sv
I C , COLLECTOR CURRENT (AMPS)
t c
t fi
4
t sv
4
f , FORCED GAIN
6
8 10
T C = 100 C
6
T C = 25 C
20
T C = 25 C
I C = 20 A
V BE(off) = 5 V
SWITCHING TIMES NOTE
8
INDUCTIVE SWITCHING
30
10
shown in Figure 7 to aid in the visual identity of these terms.
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:
In general, t rv + t fi
relationship may not be valid.
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 (t c and t sv ) which are guaranteed at 100 _ C.
For the designer, there is minimal switching loss during
As is common with most switching transistors, resistive
0.05
0.03
0.8
0.6
0.4
0.2
0.1
0.5
0.3
0.2
0.1
3
2
1
Figure 11b. Turn–Off TM Times versus Ib 2 /Ib 1
1
f = 5
Figure 10. Crossover and Fall Times
2
t c
t fi
P SWT = 1/2 V CC I C (t c ) f
]
I C , COLLECTOR CURRENT (AMPS)
t fi
2
t c . However, at lower test currents this
t sv
t c
4
6
Ib 2 /Ib 1
3
8 10
BUS98 BUS98A
T C = 100 C
T C = 100 C
T C = 25 C
4
20
T C = 25 C
I C = 20 A
f = 5
T C = 25 C
30
5
5