Micrel, Inc.
Power dissipated in a driver when the output
changes states (“shoot-through current”) in
Watts. NOTE: The “shoot-through” current
from a dual transition (once up, once down)
for both drivers is stated in Figure 7 in
ampere-nanoseconds. This figure must be
multiplied by the number of repetitions per
second (frequency) to find Watts.
R
O
=
Output resistance of a driver in Ohms.
V
S
= Power supply voltage to the IC in Volts.
P
T
=
+18V
MIC4421A/4422A
WIMA
MK22
1µF
+5.0V
1
8
6, 7
5
4
+18V
TEK Current
Probe 6302
0V
10,000pF
Polycarbonate
MIC4421A
0V
0.1µF
0.1µF
Figure 8. Peak Output Current Test Circuit
June 2007
11
M9999-062707