Datasheet

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
5
4
3
2
1
0
1
2
3
4
5
6
7
8
9
10
11
12
Voltage
Current
Voltage
Current
t, ns
LO Falling, V or A
2 1 0 1 2 3 4 5
3
2
1
0
1
2
3
4
5
6
7
8
9
10
11
12
LO Current, A
LO Voltage, V
UCC27200A, UCC27201A
www.ti.com SLUSAF9A –FEBRUARY 2011– REVISED DECEMBER 2011
The I
SOURCE
current charges the C
GS
gate capacitor and the I
SINK
current discharges it. The rise and fall time of
the voltage across the gate to source defines how quickly the MOSFET can be switched. Based on actual
measurements, the analytical curves in Figure 24 and Figure 25 indicate the output voltage and current of the
drivers during the discharge of the load capacitor. Figure 24 shows voltage and current as a function of time.
Figure 25 indicates the relationship of voltage and current during fast switching. These figures demonstrate the
actual switching process and limitations due to parasitic inductances.
Figure 24. Turn-Off Voltage and Current vs Time Figure 25. Turn-Off Voltage and Current Switching
Diagram
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