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Data subject to change. Copyright © 2005-2008 Avago Technologies Limited. All rights reserved. Obsoletes 5989-2942EN
AV02-0155EN - April 9, 2008
Figure 26. Minimum LED skew for zero dead time.
Figure 27. Waveforms for dead time.
t
PLH
MIN
MAXIMUM DEAD TIME
(DUE TO OPTOCOUPLER)
= (t
PHL MAX
-
t
PHL MIN
) + (t
PLH MAX
-
t
PLH MIN
)
= (t
PHL MAX
-
t
PLH MIN
) – (t
PHL MIN
-
t
PLH MAX
)
= PDD* MAX – PDD* MIN
*PDD = PROPAGATION DELAY DIFFERENCE
NOTE: FOR DEAD TIME AND PDD CALCULATIONS ALL PROPAGATION
DELAYS ARE TAKEN AT THE SAME TEMPERATURE AND TEST CONDITIONS.
V
OUT1
I
LED2
V
OUT2
I
LED1
Q1 ON
Q2 OFF
Q1 OFF
Q2 ON
HCPL-J314 fig 28
t
PHL MIN
t
PHL MAX
t
PLH MAX
PDD* MAX
(t
PHL-
t
PLH
)
MAX
t
PHL MAX
t
PLH MIN
PDD* MAX = (t
PHL
-
t
PLH
)
MAX
= t
PHL MAX
-
t
PLH MIN
*PDD = PROPAGATION DELAY DIFFERENCE
NOTE: FOR PDD CALCULATIONS THE PROPAGATION DELAYS
ARE TAKEN AT THE SAME TEMPERATURE AND TEST CONDITIONS.
V
OUT1
I
LED2
V
OUT2
I
LED1
Q1 ON
Q2 OFF
Q1 OFF
Q2 ON
HCPL-J314 fig 27
