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參數(shù)資料
| 型號： | TK75050 |
| 廠商： | TOKO Inc. |
| 英文描述： | SMART MOSFET DRIVER |
| 中文描述： | 智能MOSFET驅動器 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 131K |
| 代理商： | TK75050 |
January 1999 TOKO, Inc.
Page 11
TK75050
Figures 9 and 10 show the measured voltages across Q
1
(top trace) and the currents in Q
1
(bottom trace). Figure 9
shows the wave forms when there is no inductor in series
with Q
1
(i.e., L
1
is shorted). Figure 10 shows the waveforms
when there is an inductor in series with Q
1
(i.e., L
1
is not
shorted). The vertical scales are 100 V/div. (top trace) and
1 A/div (bottom trace). The horizontal scales are 25 ns/div.
As can be seen, the peak currents stay below 2.5 A
(Figure 9) or 2.8 A (Figure 10). Those numbers correspond
to 25% or 40% overshoots above the nominal current-limit
threshold of 2 A. Both figures show that the IC shuts off the
MOSFET completely in less than 50 ns after the current
passed the 2 A threshold. The measured average DC
current consumption at a bus voltage of 400 V and a
switching frequency of 30 kHz is 4.3 mA when L1 is shorted
(Figure 9) and 5.3 mA when L
1
is not shorted (Figure 10).
FIGURE 9
FIGURE 10
0V
400V
0A
2A
25ns/div.
0V
400V
0A
2A
25ns/div.
APPLICATION INFORMATION (CONT.)
SAFETY CONSIDERATIONS/LIABILITY DISCLAIMER
Dangerous voltages are present in the demo board.
Extreme caution must be used when using and testing the
circuit. Only trained personnel, experienced in working
with high voltages and power, should operate it. Use an
isolating transformer between the line and the circuit if any
grounded instrument (including the 20 V auxiliary supply
for the square-wave generator at the primary side of
transformer T
1
) is to be connected to the board. Note:
Although the two windings of transformer T
1
are isolated
from each other, the transformer is not designed to provide
safety isolation between those windings.
Toko, Inc. disclaims any and all liability arising from use or
misuse of the demo board described herein.
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