TK75050 データシートの表示（PDF） - Toko America Inc

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TK75050

SMART MOSFET DRIVER

Toko America Inc  

TK75050

APPLICATION INFORMATION (CONT.)

Figures 9 and 10 show the measured voltages across Q1

(top trace) and the currents in Q1 (bottom trace). Figure 9

shows the wave forms when there is no inductor in series

with Q1 (i.e., L1 is shorted). Figure 10 shows the waveforms

when there is an inductor in series with Q1 (i.e., L1 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 L1 is not shorted (Figure 10).

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 T1) is to be connected to the board. Note:

Although the two windings of transformer T1 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.

400V

0V

2A

0A

25ns/div.

FIGURE 9

400V

0V

2A

0A

25ns/div.

FIGURE 10

January 1999 TOKO, Inc.

Page 11

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