MJF13007 Просмотр технического описания (PDF) - Motorola => Freescale
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MJF13007 Datasheet PDF : 10 Pages
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SWITCHING TIME NOTES
In resistive switching circuits, rise, fall, and storage times
have been defined and apply to both current and voltage
waveforms since they are in phase. However, for inductive
loads which are common to SWITCHMODE power supplies
and any coil driver, 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
MJE13007 MJF13007
An enlarged portion of the turn–off waveforms is shown in
Figure 13 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 using the standard
equation from AN222A:
PSWT = 1/2 VCCIC(tc) f
Typical inductive switching times are shown in Figure 14. In
general, trv + tfi ≅ tc. However, at lower test currents this rela-
tionship 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.
SWITCHING PERFORMANCE
10000
VCC = 125 V
IC/IB = 5
IB(on) = IB(off)
1000
TJ = 25°C
PW = 25 µs
tr
100
td
10
1
2
3
4 5 6 7 8 9 10
IC, COLLECTOR CURRENT (AMP)
Figure 11. Turn–On Time (Resistive Load)
10000
7000
5000
ts
2000
VCC = 125 V
IC/IB = 5
IB(on) = IB(off)
TJ = 25°C
PW = 25 µs
1000
700
500
tf
200
100
1
2
3
4 5 6 7 8 9 10
IC, COLLECTOR CURRENT (AMP)
Figure 12. Turn–Off Time (Resistive Load)
IC
Vclamp
IB
tsv
90% IB1
90% Vclamp 90% IC
trv
tfi
tc
Vclamp
tti
10%
10%
Vclamp
IC
2%
IC
TIME
Figure 13. Inductive Switching Measurements
10000
5000
IC/IB = 5
IB(off) = IC/2
2000 Vclamp = 300 V
LC = 200 µH
tsv
1000 VCC = 15 V
500 TJ = 25°C
200
tc
100
50
tfi
20
10
0.1
0.2 0.3 0.5 0.7 1
23
IC, COLLECTOR CURRENT (AMP)
5 7 10
Figure 14. Typical Inductive Switching Times
Motorola Bipolar Power Transistor Device Data
7
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