BUS98 Motorola Inc, BUS98 Datasheet - Page 7

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

Motorola Bipolar Power Transistor Device Data
200
160
120
80
40
10
8
6
4
2
0
0.05
0.01
0
1.0
0.5
0.2
0.1
Figure 16. Rated Overload Safe Operating Area
0.1
R BE = 1.1
SINGLE PULSE
V CE , COLLECTOR–EMITTER VOLTAGE (VOLTS)
D = 0.5
T C = 25 C
100
2
0.2
0.1
Figure 17. I C = f (dV/dt)
t p = 10 s
R BE = 5
200
4
dV/dt (KV/ s)
(OLSOA)
1.0
300
BUS98A
6
R BE = 50
R BE = 0
BUS98
OVERLOAD CHARACTERISTICS
400
8
Figure 15. Thermal Response
450
10
500
10
t, TIME (ms)
and known. A good example Is a circuit where an inductor is
inserted between the transistor and the bus, which limits the
rate of rise of collector current to a known value. If the tran-
sistor is then turned off within a specified amount of time, the
magnitude of collector current is also known.
lector current is plotted for several pulse widths. (Pulse width
is defined as the time lag between the fault condition and the
removal of base drive.) Storage time of the transistor has
been factored into the curve. Therefore, with bus voltage and
maximum collector current known, Figure 16 defines the
maximum time which can be allowed for fault detection and
shutdown of base drive.
which allows precise definition of collector–emitter voltage
and collector current. This is the same circuit that is used to
measure forward–bias safe operating area.
R JC (t) = r(t) R JC
R JC = 0.7 C/W MAX
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
READ TIME AT t 1
T J(pk) – T C = P (pk) R JC (t)
Notes:
OLSOA applies when maximum collector current is limited
Maximum allowable collector–emitter voltage versus col-
OLSOA is measured in a common–base circuit (Figure 18)
V CE = V CC + V BE
Adjust pulsed current source
for desired I C , t p
100
Figure 18. Overload SOA Test Circuit
OLSOA
P (pk)
500 F
500 V
DUTY CYCLE, D = t 1 /t 2
1000
t 1
BUS98 BUS98A
t 2
V EE
V CC
10000
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