HCPL3120000E AVAGO TECH, HCPL3120000E Datasheet - Page 25

• Manufacturer Part Number: HCPL3120000E
• Manufacturer: AVAGO TECH

To minimize dead time in a given
design, the turn on of LED2
should be delayed (relative to the
turn off of LED1) so that under
worst-case conditions, transistor
Q1 has just turned off when
transistor Q2 turns on, as shown
in Figure 35. The amount of delay
necessary to achieve this condi-
tions is equal to the maximum
value of the propagation delay
difference specification, PDD
which is specified to be 350 ns
over the operating temperature
range of -40 C to 100 C.
MAX
,
Delaying the LED signal by the
maximum propagation delay
difference ensures that the
minimum dead time is zero, but it
does not tell a designer what the
maximum dead time will be. The
maximum dead time is equivalent
to the difference between the
maximum and minimum propaga-
tion delay difference specifica-
tions as shown in Figure 36. The
maximum dead time for the
HCPL-3120 is 700 ns (= 350 ns -
temperature range of -40 C to
100 C.
(-350 ns)) over an operating
Note that the propagation delays
used to calculate PDD and dead
time are taken at equal tempera-
tures and test conditions since
the optocouplers under consider-
ation are typically mounted in
close proximity to each other and
are switching identical IGBTs.
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Data subject to change.
Copyright © 2003 Agilent Technologies, Inc.
Obsoletes 5965-7875E
February 10, 2003
5988-8710EN